Go toArchive
Browse byFacets
Bookbag ( 0 )
Facet   section ZfN Section B:Volume 050  [X]
Results  299 Items
Sorted by   
Publication Year
1995 (299)
81Author    Hide Kambayashia, Junko Yuzurihara3, Yuichi Masuda3, Hiroko Nakagawab, Wolfgang Linertc, Yutaka FukudaadRequires cookie*
 Title    4-and 5-Coordinate Dinuclear Copper(II) Complexes with the Tetraacetylethanediide and an N-Alkylated Diamine or a Triamine  
 Abstract    Six dinuclear copper(II) complexes have been prepared, Cu2(taet)(plam)2X 2 where taet = 1,1,2,2-tetraacetylethanediide, plam = N-alkylated polyamine such as tmen = N,N,N',N'-tetra-methylethylenediamine or pmdt = N,N,N',N",N"-pentamethyldiethylenetriamine, X = a monovalent anion such as C104-, N 0 3-or C L. These complexes are classified into two categories from the results of electronic spectra, IR spectra, and X-ray single crystal structure analysis as follows: (1) 4-coordinate-4-coordinate dinuclear, [Cu2(taet)(tmen)2]X 2 (where X = C104~ or N 0 3-), (2) 5-coordinate-5-coordinate dinuclear, [Cu2(taet)(tmen)2Cl2], and [Cu2(taet)(pmdt)2]X 2 (where X = C104~, N 0 3-, or Cl-). The crystal structure of Cu2(taet)(tmen)2(C104)2-H20 (1) has been determined by the single crystal X-ray diffraction technique; monoclinic space group P2Ja with a = 26.478(3), b = 8.744(1), c = 15.601(3) Ä, ß = 106.195(9)°, and V = 3468.9(8) Ä 3 for Z = 4. The final agreement factors are R = 0.097 (Rw = 0.099). The geometry of each Cu(II) moiety in the dinuclear cation (1) is 4-coordinate square planar with a N 20 2 donor set. This tmen-dinuclear complex exhibits a very weak C u (II)-C u (II) interaction (J = -0.5 cm-1), and shows characteristic ESR spectra with seven hyperfine peaks in 1,2-dichloroethane solution at room temperature. This is not found for the corresponding pmdt-dinuclear complex. All complexes obtained in this study are very soluble in many organic solvents. The tmen-dinuclear complexes show pronounced solvato-chromic behavior-dependent on the solvent donor properties. This is not found for the corre­ sponding pmdt-dinuclears, which are stable as 5-coordinated species. 
  Reference    Z. Naturforsch. 50b, 536—544 (1995); received October 12 1994 
  Published    1995 
  Keywords    Dinuclear Cu(II) Complexes, 5-Coordinate Complexes, Chromotropism, Mixed Ligand Complexes, Anion Coordination 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0536.pdf 
 Identifier    ZNB-1995-50b-0536 
 Volume    50 
82Author    Masaaki Tabata, Masahiro Ide, Kentaro KanekoRequires cookie*
 Title    Thermochromism of Metal Exchange Reaction between Zinc(II) and Mercury(II) Porphyrins  
 Abstract    Thermochromism, Metalloporphyrin, Equilibrium, Zinc(II) Porphyrin, Mercury(II) Porphyrin Thermochromism was observed for an aqueous solution containing zinc(II) and mer-cury(II) cations and N-/?-nitrobenzyl-5,10,15,20-tetrakis(4-sulfonatophenyl)porphyrin anion (N Ö 2Bz(Htpps)4_) in the temperature range 10 to 70 °C. The equilibrium constants and the thermodynamic parameters of Z n (N 0 2Bztpps)3~ and H g (N 0 2Bztpps)3-have been deter­ mined spectrophotometrically to elucidate the thermochromism at 10, 15, 20, 25 and 30 °C in 0.1 mol dm-3 N a N 0 3. The protonation and metalation constants of N 0 2Bz(Htpps)4-are defined as K 2 = [ H ^ H ^ -^ H P ] -1, K3 = [H3P][H +] _1[H2P ]_1 and K^p = [M P][H +][M 2+] _1 [H P ]-1, where HP and MP denote the free base form of the prophyrin and the metallopor-phyrins of zinc(II) and mercury(II), respectively. Charges of the prophyrin and metallopor-phyrins are omitted for simplicity. The following values were found: \ogK2 = 7.75 ±0.02 (25 °C), AH°/kJ mol" 1 = -21.2±0.5 and J5°/Jmol-1K -1 = 77±1, logAT3 = 2.55±0.02 (25 °C), zl//°/kJmol_1 = -25±0.8 and zJS^Jm ol^K-1 = -35±3 and log K XnP = 0.63±0.03 (25 °C), zl//°/kJmol_1 = 31.0±0.8 and ZlS ^Jm ol^K -1 = 116±3, logA:HgP = 6.22±0.03 (25 °C), A H °l kJmol" 1 = 4.5±0.7 and zl5°/Jmol_1K _1 = 134±2. The distribution curve calculated from the thermodynamic parameters sufficiently agrees with the observed metal exchange reaction between the metalloporphyrins. 
  Reference    Z. Naturforsch. 50b, 545—550 (1995); received October 26 1994 
  Published    1995 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0545.pdf 
 Identifier    ZNB-1995-50b-0545 
 Volume    50 
83Author    Kenta Takahashi, Keisuke Umakoshi, Akihiro Kikuchi, Yoichi Sasaki, Masato Tominaga, Isao TaniguchiRequires cookie*
 Title      
 Abstract    New trinuclear rhodium(III) complexes, [Rh3(//3-0)(/i-CH3C00)6(L)3]+ (L = imidazole (Him), 1-methylimidazole (Meim), and 4-methylpyridine (Mepy)) have been prepared. The Him, Meim, and Mepy complexes show reversible one-electron oxidation waves at E1/2 = +1.12, +1.12, and +1.28 V vs Ag/AgCl, respectively, in acetonitrile. Electronic absorption spectra of the one electron oxidized species of these complexes and [Rh3(M3-0)(M-CH3C 0 0)6(py)3]+ (py = pyridine) (E 1 /2 = +1.32 V) were obtained by spectroelectrochemical techniques. While the Rh3(III,III,III) states show no strong visible absorption, the Rh3(III,III,IV) species give a band at ca. 700 nm (e = 3390-5540 mol dm" 3 cm" 1). [Ir3(«3-0)(//-CH3C00)6(py)3]+ with no strong absorption in the visible region, shows two reversible one-electron oxidation waves at +0.68 and +1.86 V in acetonitrile. The electronic absorption spectrum of the one-electron oxidized species (Ir3(III,III,IV)) also shows some absorption bands (688 nm (e, 5119), 1093 (2325) and 1400 (ca. 1800)). It is suggested that the oxidation removes an electron from the fully occupied anti-bonding orbital based on metal-d7r-/^3-0-pjr interactions, the absorption bands of the (III,III,IV) species being assigned to transitions to the a«r/-bonding orbital. esting because of their characteristic strong visible absorption and reversible multi-step redox behav­ iour [2-14]. It has been suggested that such char­ acteristic properties are associated with strong in-termetallic interactions through the central oxide bridge. The Ru(d^r)-^3 -0 (p jr) interaction is sig­ nificantly stronger than that of analogous tri­ nuclear complexes o f first row transition elements. The djr-pjr molecular orbitals shown in Fig. 1 have been proposed for the trinuclear ruthenium complexes [3,15,16], In the study of mixed ruthe-nium-rhodium complexes, it was suggested that a similar molecular orbital scheme should be appli­ cable to trirhodium and mixed ruthenium-rho-dium complexes [7]. Electronic states o f the oxo-centered triiridium (III) complexes [17,18] should also be considered in terms of the djr-pjr molec­ ular orbital scheme. Thus the oxo-centered tri­ metal complexes of heavy transition elements could be significantly different from those of first row transition elements with respect to the extent of metal-oxygen-metal interactions. The trinuclear 
  Reference    Z. Naturforsch. 50b, 551—557 (1995); received October 5 1994 
  Published    1995 
  Keywords    Trinuclear Complexes, Rhodium Complexes, Iridium Complexes, dn-ipji Interaction, Spectroelectrochemistry, Mixed Valence State 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0551.pdf 
 Identifier    ZNB-1995-50b-0551 
 Volume    50 
84Author    RajK. Bansal, Neelam Gandhi, A. Schmidpeter, K. KaraghiosoffRequires cookie*
 Title    Synthesis of [l,2,4,3]Triazaphospholo[l,5-a]pyridines+  
 Abstract    Condensation o f 1,2-diaminopyridinium iodides with tris(dimethylamino)phosphine gives [l,2,4,3]triazaphospholo[l,5-a]pyridines 2a-d. Diethylamine adds to the N=P bond o f 2a, b only if the phosphorus is oxidized at the same time. Hydrolysis of 2 a opens the triazaphos-phole ring at its 2,3-bond. 
  Reference    Z. Naturforsch. 50b, 558 (1995); received October 21 1994 
  Published    1995 
  Keywords    l, 3-Diaza-2-phosphaindolizines, NM R Spectra, Mass Spectral Fragmentation, Hydrolysis, 1, 2-Addition Reactions 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0558.pdf 
 Identifier    ZNB-1995-50b-0558 
 Volume    50 
85Author    M. Hani, A. Elgamal, HeshamS M Soliman, Helmut Duddeck, Bozhana Mikhova, M. Artin, Gartm AnnRequires cookie*
 Title    A Novel Triterpene Saponin from Gypsophila capillaris  
 Abstract    A novel C-28 tetraglycoside o f quillaic acid (1) has been isolated from G ypsophila capil­ laris. The structure was elucidated by 1 D N M R (N O E difference, DEPT, selective 13C{1H} INEPT), 2 D NM R ^ H / H and !H ,13C COSY, 'H / H / H RELAY, ROESY and TOCSY) and other spectroscopic and chromatographic evidences. Conformational dynamics within the tetrasaccharide part were estimated from N O E responses and ROESY peaks. 
  Reference    Z. Naturforsch. 50b, 563 (1995); received October 28 1994 
  Published    1995 
  Keywords    G ypsophila capillaris, Caryophyllaceae, Quillaic Acid, G lucose, Galactose 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0563.pdf 
 Identifier    ZNB-1995-50b-0563 
 Volume    50 
86Author    Reinhold Tacke3, Dirk Reichel3, KurtG. Ünther5, StefanM. ErgetbRequires cookie*
 Title    The First Liquid-Chromatographic Separation of the (/?)-and (S)-Enantiomers of a Chiral Silanol, Silane and Germane  
 Abstract    The racemic mixtures of the muscarinic antagonists cyclohexyl(phenyl)(2-pyrrolidino-ethyl)silanol (sila-procyclidine, rac-1), cyclohexyl(hydroxymethyl)phenyl(2-piperidinoethyl)-silane (rac-2) and cyclohexyl(hydroxymethyl)phenyl(2-piperidinoethyl)germane (rac-3) were resolved by analytical liquid chromatography (H PLC) using chemically modified cellulose (1) or amylose (2, 3) as the chiral stationary phase. This chromatographic method was used for the quantitative determination of enantiomeric purity of the (R)-and (S)-enantiomers of 1 -3 , which were obtained by preparative resolution with chiral auxiliary agents. Further­ more, the enantiomeric purity o f these samples was established by 13C NM R studies using chiral shift reagents. According to these studies, the resolved antipodes of 1 -3 (obtained by preparative resolution) were almost enantiomerically pure [HPLC: >98.2% ee ((R)-3) to 99.4% ee ((tf)-l, (S)-l); NMR: > 97% ee]. 
  Reference    Z. Naturforsch. 50b, 568 (1995); received October 31 1994 
  Published    1995 
  Keywords    Chiral Silanol, Chiral Silane, Chiral Germane, Liquid Chromatography, Separation o f Enantiomers 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0568.pdf 
 Identifier    ZNB-1995-50b-0568 
 Volume    50 
87Author    Hella Folkerts, Kurt Dehnicke, Jörg MagullRequires cookie*
 Title    Synthese und Kristallstruktur von [TeCl2(NPMe3)2 ] 2 Synthesis and Crystal Structure of [TeCl2(NPM e3 ) 2 ] 2  
 Abstract    Phosphoraneim inato Complex o f Tellurium, Synthesis, Crystal Structure [TeCl2(N PM e3) 2]2 has been prepared by the reaction of TeCl4 with M e3SiN PM e3 in aceto­ nitrile solution. Tlie compound forms white moisture sensitive crystals which have been char­ acterized by IR spectroscopy and by a crystal structure determination. Space group P 2i/c, Z = 2, structure solution with 3510 independent reflections, R = 0.029. Lattice dim ensions at -7 0 °C; a = 1206.0(9); b = 1054.7(7); c = 1156.0(6) pm; ß = 99.27(5)°. [TeCl2(N PM e3)2]2 forms centrosymmetric m olecules via TeCl2Te bridges with bond lengths T e -C l o f 267.2 and 366.9 pm, the longer one being in trans-position to one o f the terminally bounded (N PM e3_) groups. The TeN bond lengths of 190.1 and 192.6 pm are unusually short. 
  Reference    Z. Naturforsch. 50b, 573—5 (1995); eingegangen am 10. Oktober 1994 
  Published    1995 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0573.pdf 
 Identifier    ZNB-1995-50b-0573 
 Volume    50 
88Author    H. Szillat, Hk Müller-BuschbaumRequires cookie*
 Title    Uber das Erdalkalimetall-Lanthanoid  
 Abstract    Kupfer-Oxomolybdat (Cu0,22Mg0 ,78)BaNd2Mo4O 16 The Alkaline Earth R are E arth Copper-Oxomolybdate (C u 0 . 2 2 M g 0 . 7 8) B a N d 2 M o 4 O 1 6 Single crystals of (Cu0.22Mg0 78)B aN d2M o4O i6 have been prepared by crystallization from melts and investigated by X-ray methods. The compound crystallizes monoclinically, space group C ^ -C 1 2 /cl, Z = 4, a = 5.351(1), b = 12.891(2), c = 19.391(4) Ä, ß = 90.899(14)° and is isotypic to CuKHo2M o40 16. The crystal structure is dominated by B aO 10 and N d 0 8 poly-hedra forming a three-dimensional polyhedra network, which is filled by axially distorted (C u,M g)O fi octahedra and M o 0 4 tetrahedra. 
  Reference    Z. Naturforsch. 50b, 577 (1995); eingegangen am 4. Oktober 1994 
  Published    1995 
  Keywords    Crystal Structure, Copper, M agnesium, Barium, Neodymium, Molybdenum, Oxide 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0577.pdf 
 Identifier    ZNB-1995-50b-0577 
 Volume    50 
89Author    S. Frenzen, Hk Müller-BuschbaumRequires cookie*
 Title    Uber das gemischte Alkali-Erdalkalimetall-Oxoruthenat NaSr3R u 0 6 The Mixed Alkaline Alkaline E arth O xoruthenate NaSr3R u 0 6  
 Abstract    Single crystals of NaSr3R u 0 6 have been prepared in closed silver tubes and investigated by X-ray techniques^ This compound crystallizes with trigonal (rhombohedral) symmetry, space group Ö3d-R 3 c , a = 9.6069(8), c = 11.513(2) A, Z = 6, and is isotypic to compounds of the Sr4P t 0 6 type. The crystal structure is discussed with respect to related compounds with partial replacement o f alkaline earth elem ents by sodium and copper. 
  Reference    Z. Naturforsch. 50b, 581 (1995); eingegangen am 4. Oktober 1994 
  Published    1995 
  Keywords    Sodium, Strontium, Ruthenium, Oxide, Crystal Structure 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0581.pdf 
 Identifier    ZNB-1995-50b-0581 
 Volume    50 
90Author    S. Frenzen, Hk Müller-BuschbaumRequires cookie*
 Title    Uber einen 9L-Perowskit der Zusammensetzung Ba9Ru3? 2Mn5?8027 On a 9L-Perovskite of the Composition Ba9Ru3 2Mn5 80 27  
 Abstract    Single crystals of Ba9Ru3 2Mn5 80 27 have been prepared by flux techniques. X-ray four circle diffractometer measurements led to trigonal (rhombohedral) symmetry, space group D3d-R 3 m , a = 5.7043(5), c = 21.255(4) A , Z = 1. This phase is isotypic to B a R u 0 3. The crystal structure and the occupation of the M3O i2 triple octahedra by ruthenium and manga­ nese are discussed with respect to other oxides containing M30 12 groups in an ordered and disordered way. 
  Reference    Z. Naturforsch. 50b, 585 (1995); eingegangen am 10. Oktober 1994 
  Published    1995 
  Keywords    Barium, Ruthenium, M anganese, Oxide, Perovskite, Structure 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0585.pdf 
 Identifier    ZNB-1995-50b-0585 
 Volume    50 
91Author    Doris Waldmann, Thorsten König, Peter SchreierRequires cookie*
 Title    Iron(III)Porphinate/H202-Mediated Conversion of All-(Zs)-Retinol  
 Abstract    5,6-and 5,8-Epoxyretinol, 4-Hydroxyretinol, 4-Oxoretinol, Retinol Conversion The reaction of hydrogen peroxide with all-(£)-retinol (1) catalyzed by (meso-tetraphenyl-porphinato)iron(III) led to the formation o f 4-hydroxyretinol (2), 4-oxoretinol (3), 5,8-epoxy-retinol (4), 5,6-epoxyretinol (5), 3-dehydroretinol (6), all-(£)-and 12-(Z)-retroretinol (7/7a) as well as all-(£')-and 12-(Z)-anhydroretinol (8/8 a) as major non-volatile products. The con­ version products were characterized by comparison of their chromatographic (H PLC) and spectroscopic data (UV; MS; 'H and 13C NM R) with those of synthesized reference com ­ pounds. The observed product formation supports the hypothesis of a C 4 centered radical as the key intermediate of all-(£')-retinol conversion. 
  Reference    Z. Naturforsch. 50b, 589—5 (1995); received October 13 1994 
  Published    1995 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0589.pdf 
 Identifier    ZNB-1995-50b-0589 
 Volume    50 
92Author    Hans Bock, Sabine Nick, Christian Näther, Klaus RuppertRequires cookie*
 Title    Wechselwirkungen in Kristallen 62 [1, 2] a Polymer String with Chelate-Capped Hydrogen Bridges (e O -H O ) N a @(DM E)2 Crystal Structures, 2,5-Bis(trimethylsilyl)-p-quinone and -hydroquinone-monosodium Salt, C helate-Capped Hydrogen Bridges  
 Abstract    Kristallisation und Strukturbestimmung von 2,5-Bis(trimethylsilyl)-/?-benzochinon und von 2,5-Bis(trimethylsilyl)hydrochinon-natrium-bis(dimethoxyethan), einem Polymer-Strang mit Chelat-überkappten Wasserstoffbrücken (e O »H O)N a® (D M E)2 Interactions in Crystals, 62 [1, 2] Crystallization and Structure D eterm ination of 2,5-Bis(trimethylsilyl)-/?-benzoquinone and of 2,5-Bis(trimethylsilyl)hydroquinone Sodium Bis(dimethoxyethane), 
  Reference    Z. Naturforsch. 50b, 595 (1995); eingegangen am iS. August 1994 
  Published    1995 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0595.pdf 
 Identifier    ZNB-1995-50b-0595 
 Volume    50 
93Author    Hans Bock, Sabine Nick, Christian Näther, Wolfgang BenschRequires cookie*
 Title    Wechselwirkungen in Kristallen, 63 [1, 2]  
 Abstract    Kristallisation und Strukturbestimmung von 1,2-Dimesitoylbenzol und von Bis(hydrogen-l,2-dimesitoylbenzol)-dinatrium-bis(ethylendiamin) Interactions in Crystals, 63 [1, 2] Crystallization and Structure Determ ination of 1,2-Dimesitoylbenzene and of Bis(hydrogen-l,2-dimesitoylbenzene)-disodium-bis(ethylendiamine) 
  Reference    Z. Naturforsch. 50b, 605 (1995); eingegangen am 18. August 1994 
  Published    1995 
  Keywords    1, 2-Dimesitoylbenzene, Radical A nion Sodium Salt, Single Crystal Structures, M N D O Calculations 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0605.pdf 
 Identifier    ZNB-1995-50b-0605 
 Volume    50 
94Author    R. Obert Schröck, Klaus Angermaier, H. Ubert SchmidbaurRequires cookie*
 Title    A Synthetic Pathway to Arylsilyl(silyl)arenes; Selective Si-C Cleavage in Bis(arylsilyl)arenes with Triflic Acid  
 Abstract    Silanes, Silylbenzenes, Arylsilyl(silyl)benzenes, Arylsilyl(silyl)naphthalenes Bis(arylsilyl)arenes such as bis(/?-tolylsilyl)benzene and bis(p-anisylsilyl)naphthalene are available from in situ Grignard reactions of the corresponding haloarenes, arylchlorosilanes and magnesium in tetrahydrofuran. Treatment of these products with one equivalent o f tri-fluoromethanesulfonic (triflic) acid at low temperatures leads to arylsilyl(trifluoromethyl-sulfonatosilyl)arenes, which can be converted into arylsilyl(silyl)arenes using LiA lH 4. The regioselectivity of the S i-C cleavage is surprisingly high. Any of the first dearylation steps is faster then the consecutive steps. Ortho, meta and para substituted p-tolylsilyl(silyl)benz-enes, l,4-dibromo-2-(/?-tolylsilyl)-5-(silyl)benzene, and l-(/?-anisylsilyl)-8-(silyl)naphthalene have thus been obtained in good to moderate yields. These compounds can serve as starting materials for m onofunctional arylsilanes with a tailored structure. The crystal structure of l-(p-anisylsiIyI)-8-(siIy!)naphthalene has been determined by single crystal X-ray diffraction. 
  Reference    Z. Naturforsch. 50b, 613 (1995); received October 24 1994 
  Published    1995 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0613.pdf 
 Identifier    ZNB-1995-50b-0613 
 Volume    50 
95Author    Verena Schultz-Coulon, Wolfgang SchnickRequires cookie*
 Title    C a M g 2N 2 -ein gemischtes Erdalkalimetallnitrid mit fl#if/-La20 3-Struktur CaMg2N 2 -a Mixed Alkaline-Earth Metal Nitride with anti-La20 3 Structure  
 Abstract    CaMg2N 2 (trigonal, P 3 m l (Nr. 164); a = 354.046(1), c = 609.079(2) pm; Z = 1) is isotypic to the anti-La20 3 structure with octahedral and tetrahedral coordination for Ca2+ and M g2+ ions, respectively. The compound has been prepared by the reaction o f the binary nitrides Ca3N 2 and M g3N 2 (molar ratio 1:2) in a tungsten crucible under a pure nitrogen atmosphere at 1050 °C. The formation o f the solid CaM g2N 2 may be interpreted in analogy to reactions o f related oxides as an acid-base reaction between the binary nitrides with different coordina­ tion tendencies o f Ca2+ and M g2+ ions. A n analysis o f the binary aristotype anti-La20 3 indica­ tes that this structure is predisposed for building ternary phases. 
  Reference    Z. Naturforsch. 50b, 619—622 (1995); eingegangen am 31. August 1994 
  Published    1995 
  Keywords    Alkaline-Earth Metal Nitrides, Preparation, Crystal Structure, Structural Relations 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0619.pdf 
 Identifier    ZNB-1995-50b-0619 
 Volume    50 
96Author    D., J. Baurmeister, A. Franken, W. PreetzRequires cookie*
 Title    Darstellung, Schwingungsspektren und Normalkoordinationsanalyse der  
 Abstract    -und 13C-Isotopom eren des Methylpentahydro-c/oso-hexaborats [B 6H 5(C H 3) ] 2~ sowie Kristallstruktur von [ P (C 6H 5) 4] [ B 6H 6(C H 3) ] Preparation, Vibrational Spectra and Normal Coordinate Analysis o f the D and 13C Isotopomeres of the Methylpentahydro-c/oso-hexaborate [B6H 5(C H 3) ] 2~ and the Crystal Structure of [P (C 6H 5) 4][B 6H 6(C H 3)] Methylpentahydro-c/o5,o-hexaborate(2-) , Methylhexahydro-c/oso-hexaborate(1 -) , Vibrational Spectra, Normal Coordinate Analysis, Isotopomers The crystal structure of [P (C 6H 5) 4][B 6H 6(C H 3)]_has been determined by single crystal X-ray diffraction analysis; triclinic space group P I with a = 7.408(2), b = 11.887(3), c = 14.4486(9) A , a = 80.013(12), ß = 79.421(10), y = 88.85(2)°. The additional H atom could be refined with B -H distances between 1.21 and 1.31 Ä above one of the facettes o f the B6 octahedron adjacent to the methyl group. The IR and Raman spectra of the ueprotonated Cs salts of the six isotopomers [B6H 5(C H 3) ] 2_, [B6H 5(C D 3) ] 2_, [B6H 5(13C H 3)]2_, [B6D 5(C H 3)]2-, [B6D 5(C D 3)]2-and [B6D 5(13C H 3) ] 2_ exhibit characteristic shifts o f their vi­ bration bands. Using the crystallographic data a normal coordinate analysis has been per­ formed, based on a general valence force field. With a set of 14 force constants (e.g. fd(B B) = 1.80, fd(B C) = 3.70, fd(B H) = 3.17, fd(C H) = 4.62 mdyn/Ä) good agreement between observed and calculated frequencies o f all D and 13C isotopically labeled derivatives has been achieved. The potential energy distribution on the force constants reveals strong vibrational couplings of the boron cage with the substituents. The B -C stretching vibration o f the C H 3 group is observed in the region 1142-1153 c m '1, for the C D 3 substituent at higher frequencies of 1168-1179 cm-1. 
  Reference    Z. Naturforsch. 50b, 623—629 (1995); eingegangen am 10. Oktober 1994 
  Published    1995 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0623.pdf 
 Identifier    ZNB-1995-50b-0623 
 Volume    50 
97Author    JanKarsten Schaefer, BluhmRequires cookie*
 Title     
 Abstract    uT m 2[ B 20 5] 2: D as erste "M etaborat" mit einem x [ B 20 5] 4 -Anion CuTm2[B20 5]2: The First " Metaborate" with a ^ [ B ^ s ] 4 -Anion Single crystals o f the compound CuTm2[B 20 3]2 were obtained by a B20 3 flux technique. The compound contains a hitherto unknown metaborate anion with the formula ^ [ ^ O s ] 4-. It crystallizes in the monoclinic space group C|h-P2!/c with a = 452.18(7); b = 720.0(2); c = 929.2(5) pm; ß -90.16(5)°; Z = 2. The metaborate layers consists of four and eight membered rings of edge-sharing B 0 4-tetrahedra resembling the complex anion in the isotypic gadolinite structure of F e Y 2[B eS i0 3]2. The layers are connected via copper-centered elongated oxygen octahedra and slightly distorted thulium-centered tetragonal oxygen antiprisms. 
  Reference    Z. Naturforsch. 50b, 630—634 (1995); eingegangen am 2. August/11. November 1994 
  Published    1995 
  Keywords    Copper, Thulium, Borate, Synthesis, Crystal Structure 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0630.pdf 
 Identifier    ZNB-1995-50b-0630 
 Volume    50 
98Author    WernerU., Matthias Koch3, Siegfried Pohla, Wolfgang Saak3, Wolfgang Hillerb, Maximilian HeckelbRequires cookie*
 Title    Trimethylaminoxidaddukte an Tetrakis[bis(trimethylsilyl)methyl]dialuminoxan: R 2 A l -O -A1R2 * O N M e 3 und R 2A l -0 -A l R 2* 2 0 N M e 3 mit  
 Abstract    gewinkelten A l -O -A l -G r u p p e n Adducts of Trimethylaminoxide with Tetrakis[bis(trimethylsilyl)methyl]di-aluminoxane: R 2A l -0 -A l R 2 0 N M e 3 and R 2A l -0 -A l R 2-2 0 N M e 3 with Bent A l -O -A l Groups Dialuminoxane, Group of A l -O -A l , Adducts with Trimethylaminoxide The sterically highly shielded and monomeric tetrakis[bis(trimethylsilyl)methyl]dialumino-xane R 2A l -0 -A l R 2 (R = C H (S iM e3) 2) 1 forms 1:1 and 1:2 adducts on treatment with trimethylamine oxide. Both products have been characterized by crystal structure determina­ tion. Contrary to the linear educt 1, the complexes show bent A l -O -A l groups with bond angles o f 162.3 and 161.4°. The mono adduct 2 has three-and four-coordinated A l atoms with a very short A l -O bond between the bridging oxygen and the coordinatively unsaturated A l atom (168.7 pm), possibly indicating a jr-interaction. The second bond o f the dialuminoxane fragment is lengthened to 175.3 pm and represents a " normal" A l -O distance. The A l -O bond to the amine oxide ligand (184.6 pm) lies within the range o f dative A l -O bonds. As shown by N M R spectroscopy the unsymmetrical structure is preserved in toluene solution up to 90 °C. In the bis(amine-oxide) adduct 3 both A l atoms are four-coordinated with very similar inner A l -O bond lengths o f 173.6 pm. 
  Reference    Z. Naturforsch. 50b, 635—641 (1995); eingegangen am 4. Oktober 1994 
  Published    1995 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0635.pdf 
 Identifier    ZNB-1995-50b-0635 
 Volume    50 
99Author    R. Olf, W. Saalfrank3, Klaus Schobert3, Stefan Trümmer3, Alexander WolskibRequires cookie*
 Title    Synthese und Koordinationschemie eines neuartigen Bistetrazols: Ein 1 D -M etallopolym er durch Selbstorganisation koordinativ ungesättigter Z in k (II)-M o n o m ere [1] Synthesis and Coordination Chemistry of a New Bistetrazole: A 1 D-Metallopolymer via Self-Assembly of Monomerie Zinc(II)-Buildingblocks  
  Reference    Z. Naturforsch. 50b, 642—648 (1995); eingegangen am 10. Oktober 1994 
  Published    1995 
  Keywords    Bistetrazole, Coordination Polymer 1 D, Bis(bistetrazolato)zink(II) Complex, Spontaneous Self-Assembly, X-Ray 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0642.pdf 
 Identifier    ZNB-1995-50b-0642 
 Volume    50 
100Author    CorneliusG. Kreiter, Wolfgang Michels, Gerhard HeebRequires cookie*
 Title    Photoreaktionen von Dekacarbonyldirhenium mit A llen und unverzweigten Allenderivaten Photoreactions of Decacarbonyldirhenium with Allene and Unbranched Derivatives o f Allene  
 Abstract    Decacarbonyldirhenium (1) reacts upon U V irradiation with allene (2), 1,2-butadiene (3) and 2,3-pentadiene (4) preferentially by CO substitution and oxidative rearrangement to the corresponding enneacarbonyl-//-?/1:3-endiyl-dirhenium complexes 5, 9, and 15 and to the octacarbonyl-,«-//-:2-allene-dirhenium complexes 6, the stereoisomers 10, 11, and 16. A t ele­ vated temperature 5, 9, and 15 loose CO and yield by a reductive rearrangement also the complexes 6, 10, 11, and 16. In addition to these main products, depending upon the allene derivative used, various by-products are obtained. By-products of the reaction o f 1 with 2 are octacarbonyl-M-/73:3-(2,3-dimethylene-buta-l,4-diyl)dirhenium (7) and ^-^^-allene-hexacarbonyl-/!-//1:3-i-propene-l,3-diyl-dirheniurn (8). The photo reaction of 1 with 3 yields, in addition to 9-11 , tetracarbonyl-^3-(£'-5-ethylidene-4-methyl-2-cyclopenten-l-yl)rhenium (12) 
  Reference    Z. Naturforsch. 50b, 649—660 (1995); eingegangen am 28. September 1994 
  Published    1995 
  Keywords    Decacarbonyldirhenium, Photoreaction, Allene, Derivatives, Complexes 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0649.pdf 
 Identifier    ZNB-1995-50b-0649 
 Volume    50 
Prev
1
2
3
4
5
...
Next