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1994 (62)
41Author    Mitra Ghassemzadeh, Kurt Dehnicke, Helmut Goesmann, Dieter FenskeRequires cookie*
 Title    //2-Halogenokomplexe von N-Iodsuccinimid. Die Kristallstrukturen von PPh4[X(N-Iodsuccinimid)2] * CH3CN mit X = Cl, Br, I /^2-Halogeno Complexes of N-Iodosuccinimide. The Crystal Structures of PPh4 [X(N-Iodosuccinimide)2] * CH 3CN with X = Cl, Br, I  
 Abstract    The ,a2-halogeno complexes PPh4[X(N-Iodosuccinimide)2] • CH 3CN with X = Cl. Br, I have been prepared by reactions of N-Iodosuccinimide with the corresponding tetraphenylphos-phonium halides PPh4X in acetonitrile solutions. The compounds form pale yellow crystal needles, which were characterized by IR spectroscopy and by crystal structure determina­ tions. PPh4[Cl(N-Iodosuccinimide)2] C H 3CN (1): Space group Pna2!, Z = 4, 4461 observed unique reflections, R -0.027. Lattice dimensions at -6 0 °C: a = 1840.5(9), b = 2589(1), c = 728.2(4) pm. 
  Reference    Z. Naturforsch. 49b, 602—608 (1994); eingegangen am 22. Dezember 1993 
  Published    1994 
  Keywords    Halogeno Complexes of N-Iodosuccinimide, Synthesis, IR Spectra, Crystal Structure 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0602.pdf 
 Identifier    ZNB-1994-49b-0602 
 Volume    49 
42Author    M. Ahm, Shakibaie-M Oghadam, Ulrich Timper, Gert HellerRequires cookie*
 Title    Darstellung und Struktur dreier verschiedener Bis(ethylendiamin)-kupfer(II)-tetraborate Preparation and Structure o f Three Different Bis(ethylenediamine) Copper(II) Tetraborates  
 Abstract    Three different bis(ethylenediamine) Copper(II) tetraborates have been prepared: Cu(en),[B40 5(0 H)4]-2 B (0 H)3 (A), 2{Cu(en),B (0H)3 H 20[B 40 5(0 H)4]} H ,0 (B) and 
  Reference    Z. Naturforsch. 49b, 627—634 (1994) 
  Published    1994 
  Keywords    Bis(ethylenediamino) Copper Tetraborates, Boric Acid Molecules, Preparation, Crystal Structure 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0627.pdf 
 Identifier    ZNB-1994-49b-0627 
 Volume    49 
43Author    IrinaB. Ecker, M. Arcus, W. Indhaus, R. Ainer, M. AttesRequires cookie*
 Title    Synthesen, 121Sb-Mößbauer-Spektren und  
 Abstract    Strukturen von [SbF3(18-Krone-6)], [SbF3(18-Krone-6)]*CH3CN und [(SbF3)2(12-Krone-4)] Synthesis, 121Sb-M ößbauer Spectra and S tructures of [SbF3(18-Crown-6)], [SbF3(18-Crown-6)] C H 3CN, and [(SbF3)2(12-Crow n-4)] The crown ether complexes SbF3(18-crown-6) (1), SbF3(18-crown-6) • CH3CN (2) and (SbF3)2(12-crown-4) (3), have been prepared by reactions of SbF3 and the corresponding crown ether. They have been characterized by IR. Raman and 121Sb-Mößbauer spectroscopy, and by X-ray structure determinations. The s electron density at the Sb atom is diminished in these complexes. 1 and 2 show a symmetrical half-sandwich structure, with coplanar O atoms and S b -O distances ranging from 298 to 321 pm. 3 has a band-like structure. The two metal centers adopt different stereochemistries. The S b -O distances are in the range from 269 to 325 pm. One oxygen atom of 12-crown-4 has a bridging function. Crystal data for 1: space group P 21212i, a = 823,1(1), b = 1146,1(2), c = 1807,0(3) pm, Z = 4; 2: space group P2,/c. a = 1257,7(3), b = 828,9(2), c -1895,5(5) pm, ß = 93,68(2). Z = 4; 3: space group P2j/c, a = 805,6(1), b = 2143,1(4), c = 836,4(2) pm, ß = 90,98(1), Z = 4. 
  Reference    Z. Naturforsch. 49b, 870—876 (1994); eingegangen am 30. Dezember 1993 
  Published    1994 
  Keywords    Crown Ether Complexes of SbF3, 121Sb-Mößbauer Spectra, Crystal Structure 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0870.pdf 
 Identifier    ZNB-1994-49b-0870 
 Volume    49 
44Author    Birgit Bäck, H. An, S. PreutRequires cookie*
 Title    Uber die Reaktionen von Molekülen  
 Abstract    (R2CS)2 (R = CF3, CI) und C12CS mit XeF+MF6-(M = As, Sb) und Kristallstruktur von (CF3)2CSC(CF3)2SF+SbF6-[1] O n th e R eactions of M olecules (R 2C S)2 (R = C F 3, Cl) and C12CS with X eF +M F6_ (M = As, Sb) and C rystal Structure of (C F3)2C SC (C F3)2SF+SbF6~ [1] R olf M inkwitz XeF+MF6_ (M = As, Sb) reacts with ((CF3)2CS)2 and C12CS to form the corresponding monofluorinated sulfonium hexafluorometalates. The salts have been characterized by vibra­ tional and 19F NMR spectroscopic measurements. (CF3)2CSC(CF3)2SF+SbF6^ crystallizes in the monoclinic space group C2/c with a =o 14.791(10), b = 11.093(6), c -10.356(6)Ä, ß -119.83° and Z = 4. With a value of 1.51(1) A d (S -F) is comparable to the SF-bond distance in (CF3)(C1)CSC(CF3)(C1)SF+AsF6-. 
  Reference    Z. Naturforsch. 49b, 881—888 (1994); eingegangen am 10. November 1993 
  Published    1994 
  Keywords    Monofluorosulfonium Salts, Preparation, Vibrational Spectra, 19F NMR Data, Crystal Structure 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0881.pdf 
 Identifier    ZNB-1994-49b-0881 
 Volume    49 
45Author    Blaschette, PeterG. Jones, Karin Linoh, Ilona Lange, M. Artina Näveke, Dagmar Henschel, Axel Chrapkowski, Dietm Ar, SchomburgRequires cookie*
 Title    Arm  
  Reference    Z. Naturforsch. 49b, 999—1011 (1994); eingegangen am 1. Februar 1994 
  Published    1994 
  Keywords    Polysulfonylamines, 18-Crown-6-Dimesylamine (3/2), Synthesis, Crystal Structure, Coronand Conformation 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0999.pdf 
 Identifier    ZNB-1994-49b-0999 
 Volume    49 
46Author    H. Bocka, T. H. Auck3, C. N. Äthera, Z. HavlasbRequires cookie*
 Title    Wechselwirkungen in Kristallen, 35 [ 1, 2]  
 Abstract    Einkristallzüchtung von Na0 ^C(NO2)3 [***] aus Etherlösungen zu einem polymeren Band [(Na" 9 C (N 0 2)3) D io x a n ^ und einem Lösungsmittel-getrennten Ionenpaar [(Na0 /18-Krone-6)(THF)2]0 [(Na0 /18-K rone-6)(O N O -C e (NO 2)2)2]e Interactions in Crystals, 35 [1, 2] Single Crystal Growths of Na0 e C (N O 2)3 [***] from Ether Solutions to a Polymer Band [(Na0 e C (N O2)3)Dioxane]TO and to a Solvent-Separated Ion Pair [(Na0 /18-Crown-6)(THF)2]0 [(Na0 /18-C row n-6)(O N O -C e (N O 2)2)2]e The sodium salt of the most simple polynitro-substituted hydrocarbon anion, Na0 e C (N O 2)3, (for a hazard warning cf. [***]) crystallizes from ether solutions without and with addition of 18-crown-6 either in a polymer band, [(Na®0 C (N O 2)3)dioxane]oo, or as a solvent-separated ion pair, [(Na®/18-crown-6)(THF2]0 [(Na®/18-crown-6)(O2N -C e (N O 2)2)2]e . The Na® cations are each 8-fold coordinated in hexagonal bipyramidal arrangement. According to extensive quantum-chemical calculations based on the structure coordinates, the formation of these novel salts can be traced back to the charge distribution in the anions e C (N 0 2)3, which due to negatively charged oxygen centers are favorable complex ligands. The structure determining effects of solvation are discussed. 
  Reference    Z. Naturforsch. 49b, 1012—1020 (1994); eingegangen am 31. Januar 1994 
  Published    1994 
  Keywords    Trinitromethanide Salts, Single Crystal Structure, M N DO Calculations, Solvation Effects 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-1012.pdf 
 Identifier    ZNB-1994-49b-1012 
 Volume    49 
47Author    Hans Bocka, Sabine Nicka, ChristianN. Äthera, JanW. Bats3, Professor Franz-GustavRequires cookie*
 Title    Strukturen ladungsgestörter Moleküle, 47 [1 , 2 ] Dinatrium-und Dikalium-Nitranilate: Die Cyanin-Verzerrung der Kohlenstoff-Sechsringe Structures of Charge-Perturbed Molecules 47 [1,2] Disodium and Dipotassium Nitranilates: The Cyanine Distortion of the Six-Membered Carbon Ring  
 Abstract    Crystals of lemon yellow dipotassium nitranilate and of yellow disodium nitranilate di­ hydrate have been grown and their structures determined at 290 and 200 K. The six-member-ed, 0 2N-disubstituted rings show a pronounced cyanine distortion with all four CO bonds identical and the two (0 C C (N 0 2) C 0) e chains connected by single CC bonds of each 156 pm length. In the anhydrous K® salt, the ring is planar, but in the Na® hydrate salt it exhibits a twist conformation. Quantum chemical calculations allow to reproduce the structure in every detail, demonstrate strong charge alternation along the cyanine chains with considerable delocalization into the 0 2N acceptor substituents, and suggest that the rather long connecting CC bonds contain positively charged carbon centers on both ends. In addition, metal ion coordination effects as well as the rather high pKa value of nitranilic acid are rationalized. 
  Reference    Z. Naturforsch. 49b, 1021—1030 (1994); eingegangen am 17. März 1994 
  Published    1994 
  Keywords    Cyanine Distortion of C6-Rings, Single Crystal Structures, Semiempirical Calculations 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-1021.pdf 
 Identifier    ZNB-1994-49b-1021 
 Volume    49 
48Author    W. Lübbe, A. Franken, W. PreetzRequires cookie*
 Title    Darstellung, n B-, 13C-, 'H-NMR-und Schwingungsspektren  
 Abstract    von 1.2-Trimethylenpentahydro-closo-Hexaborat(l -) , c i s -[B6H5(CH2)3]" und 1.2-TetramethyIenpentahydro-closo-Hexaborat(l-), cjs-[B6H5(CH2)4]_ sowie Kristallstrukturen von [P(C6H5)4][B6H5(CH2)3] und [P(C6H5)4][B6H5(CH2)4] Preparation, n B, 13C, 'H NMR and Vibrational Spectra of 1.2-Trim ethylenepentahydro-closo-hexaborate(l-), ds-[B 6H 5(C H 2)3]_, and 1.2-Tetram ethylenepentahydro-closo-hexaborate(l-), ds-[B 6H 5(CH 2)4]~, and the Crystal Structures of [P(C6H 5)4][B6H 5(CH 2)3] and [P(C6H 5)4][B6H 5(C H 2)4] 1.2-Trimethylenepentahydro-closo-hexaborate(l -) , 1.2-Tetram ethylenepentahydro-closo-hexaborate( 
  Reference    Z. Naturforsch. 49b, 1115—1122 (1994); eingegangen am 17. Januar 1994 
  Published    1994 
  Keywords    ), Crystal Structures, 'H NM R Spectra, Vibrational Spectra 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-1115.pdf 
 Identifier    ZNB-1994-49b-1115 
 Volume    49 
49Author    M. Arcos, L. Uján, FrankKubel H Ans SchmidRequires cookie*
 Title    Crystal Growth and X-Ray Structure of Metastable «-KC0 PO 4  
 Abstract    Crystals o f KC0PO4 were obtained by growth in a gel of tetramethoxysilane/water at 64 °C. The hexagonal crystals have space group P 63, a = 18.206(1), c = 8.5135(8) [Ä], V = 2443.8(4) [A 3]. Z = 24. The structure was solved by single crystal X-ray diffraction methods. The struc­ ture is isotypic with a -K Z n P 0 4. It comprises an ordered three dim ensional network o f alter­ nating C oÖ 4 and P 0 4 tetrahedra. which has rings of six tetrahedra in the xy plane. These rings form tunnels in the [001] direction, where the potassium ions are located. U pon heating, the compound undergoes a phase transition at about 565 °C; on cooling, the phase transition occurs at 449 °C, where it transforms into another structure which is yet unknown. This indicates that the hexagonal structure is a metastable phase. 
  Reference    Z. Naturforsch. 49b, 1256—1262 (1994); received May 4. 1994 
  Published    1994 
  Keywords    Potassium Cobalt Orthophosphate Crystal Structure, Crystal Growth, Metastable Phase Phase Transition 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-1256.pdf 
 Identifier    ZNB-1994-49b-1256 
 Volume    49 
50Author    Hendrik Möller, Ellen Suchanek, HeinzDieter Lutz, Werner PaulusRequires cookie*
 Title    Neutronenbeugungs-Untersuchung von M g(I03)2*4H 20 -Einkristallen Neutron Diffraction Studies on M g (I0 3 )2 -4H 20 Single Crystals  
 Abstract    The crystal structure of M g (I 0 3)2-4 H 20 has been determined by neutron single crystal diffraction (P2j/c, Z = 2, R = 2,2% on the basis of 1107 observed reflections). M g (I 0 3)2-4 H 20 forms a layered structure built up of octahedral M g(H 20) 4(I 0 3)2 units linked by hydrogen bonds. The two crystallographically different water m olecules are in­ volved in asymmetric, nearly linear hydrogen bonds to adjacent iodate ions (vOD of matrix isolated HDO: 2480, 2475, 2425 und 2412 cm -1, IR spectroscopic data, 90 K). The strength of the hydrogen bonds as well as that of other iodate hydrates is discussed in terms o f both the synergetic effect and Brown's bond valences. 
  Reference    Z. Naturforsch. 49b, 1334—1338 (1994); eingegangen am 2. Mai 1994 
  Published    1994 
  Keywords    Magnesium Iodate Tetrahydrate, Crystal Structure, Neutron Diffraction Studies, Hydrogen Bonds 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-1334.pdf 
 Identifier    ZNB-1994-49b-1334 
 Volume    49 
51Author    Stefan Horstmann, Wolfgang SchnickRequires cookie*
 Title    Synthese, Kristallstruktur und Eigenschaften von Tetraaminophosphoniumiodid [P(NH2)4]I Synthesis, Crystal Structure, and Properties of Tetraaminophosphonium Iodide [P(NH2)4]I  
 Abstract    The title compound has been prepared starting from phosphorothionic triamide SP(N H 2)3 by methylation of the sulfur atom and subsequent ammonolysis reaction in dry acetonitrile and dichloromethane, respectively, both at room temperature. Suitable single crystals are obtained from an acetonitrile solution in a temperature gradient between 70 °C and room temperature. The crystal structure o f [P(N H 2)4]I has been determined by single crystal X-ray methods (P 4!nbm\ a = 842.6(2), c = 486.7(2) pm, Z = 2). In the solid [P(NH2)4]+-and I~-ions are found with significant N -H -I -h y d r o g e n bonding interactions between anions and cations (H —I: 276.4 pm). The P -N -b o n d length in the cation (160.7(2) pm) represents the shortest P -N H 2 bond distance reported to date indicating a significant electrostatic strengthening. The condensation behaviour of [P(N H 2)4]I in solution and in the solid has been investigated. 
  Reference    Z. Naturforsch. 49b, 1381—1386 (1994); eingegangen am 5. Mai 1994 
  Published    1994 
  Keywords    Tetraaminophosphonium Salt, Synthesis, Crystal Structure, Hydrogen Bonding, Condensation Reactions 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-1381.pdf 
 Identifier    ZNB-1994-49b-1381 
 Volume    49 
52Author    Roland Boese3, RolandK. Österb, M. Ohamed YalpanibRequires cookie*
 Title    Produkte der Carbodiimid-Hydroborierung mit (9H -9-BBN)2 [1] Hydroboration Products of Carbodiimides with (9H-9-BBN) 2 [1]  
 Abstract    The hydroboration of H n C6N=C=NC6H n (A) with (9H -9-B B N)2 (C2) gives H n C6N= 
  Reference    Z. Naturforsch. 49b, 1453—1458 (1994); eingegangen am 13. Mai 1994 
  Published    1994 
  Keywords    Carbodiimides, Addition of 9-BBN, Formamidine, Crystal Structure, Formaminal 
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 Identifier    ZNB-1994-49b-1453 
 Volume    49 
53Author    M. Anfred Fild, PeterG. Jones, Karsten Ruhnau, Carsten ThöneRequires cookie*
 Title    Darstellung und Strukturen von 2,2,4,4-Tctrafluor-l,3-diphosphctancn und -1,3-diphosphetan-disulfiden Synthesis and Structures of 2,2,4,4-Tetrafluoro-l,3-diphosphetanes and of -1,3-diphosphetane Disulfides  
 Abstract    A simple route to 1,3-diphosphetanes [RPCF2]2 [R = Ph, Me, Bu'] is described. The phos-phaalkene intermediates RP=CF2, as well as the corresponding disulfides [R (S)PC F2]2 have been characterized. The crystal structures of [PhPCF2]2, and of the sulfides [Ph(S)PCF2]2 and [Bu'(S)PCF2]2 are reported. 
  Reference    Z. Naturforsch. 49b, 1361—1367 (1994); eingegangen am 6. Juni 1994 
  Published    1994 
  Keywords    Phosphaalkenes, 1, 3-Diphosphetanes, 1, 3-Diphosphetane Disulfides, NM R Spectra, Crystal Structure 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-1361.pdf 
 Identifier    ZNB-1994-49b-1361 
 Volume    49 
54Author    Peter Dierkes, Kurt Dehnicke, Dieter FenskeRequires cookie*
 Title    Diinkomplexe  
 Abstract    von Wolfram(VI). D ie Kristallstruktur von [(Et2S)WCl4(Me3S i-C = C -(C H 2)4 -C = C -S iM e 3)WCl4(SEt2)] Diyne Complexes of Tungsten(VI). The Crystal Structure of [(Et2 S)WCl4 (M e3Si -C = C -(C H 2)4-C ^ C -SiMe3) WCl4 (SEt2)] The diyne complexes [(Et2S)W C l4(R -C ^ C -(C H 2)" -C = C -R)W C l4(SEt2)] (R = SiM e3, n = 3, 4, 8; R = C6H 5, n = 4, 8) have been prepared by the reaction o f /rarcs-[WCl4(SEt2)2] with the corresponding diyne in toluene solutions. The com plexes form green or orange, diamagne­ tic, moisture sensitive crystal powders, which were characterized by their IR and 13C NM R spec­ tra. The crystal structure of the com plex with R = SiM e3 and n = 4 has been determined. [(Et2S)WCl4(M e3S i-C = C -(C H 2)4-C = C -S iM e 3)W Cl4(SE t2)]: Space group P2j/c, Z -2, 3620 observed unique reflections with I>2a(I), R = 0.027. Lattice dimensions at -7 0 °C: a -1431.8(11), b -839.6(8), c = 1731.3(11) pm, ß = 112.74(2)°. The structure consists o f m ole­ cules in which both tungsten atom s are surrounded by four chlorine atoms in equatorial positions, both alkyne groups are bonded side on (rj2) to the tungsten atoms, whereas the sulfur atoms of the diethylsulfide molecules are located trans to the alkyne groups. 
  Reference    Z. Naturforsch. 49b, 1391—1396 (1994); eingegangen am 17. Mai 1994 
  Published    1994 
  Keywords    Diyne Complexes of Tungsten(VI), Synthesis, IR Spectra, NM R Spectra, Crystal Structure 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-1391.pdf 
 Identifier    ZNB-1994-49b-1391 
 Volume    49 
55Author    Hansjürgen Mattausch, Thomas Gulden, R. Einhard, K. Kremer, Jörg Horakh, A.Rndt SimonRequires cookie*
 Title    H o4 C7, Y4 C7: Carbides with C34-and C4" Ions  
  Reference    Z. Naturforsch. 49b, 1439—1443 (1994); eingegangen am 17. Mai 1994 
  Published    1994 
  Keywords    Holm ium Carbide, Yttrium Carbide, Crystal structure, Allenylide Ions, Paramagnetic Behaviour 
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 Identifier    ZNB-1994-49b-1439_n 
 Volume    49 
56Author    Unsymmetrische Diorganomagnesiumverbindungen, Heiko Viebrock, Dirk Abein, Erwin Weiss+Requires cookie*
 Title    Über Metallalkyl-und -arylverbindungen, 51. Mittig.* On Metal Alkyl and Aryl Compounds, Part 51 Unsymmetrical Diorganomagnesium Compounds. MgRR'(L) and Solvens Separated Ion Pairs with R = Me  
 Abstract    Amine adducts of diorganomagnesium compounds MgR2(L) are soluble in hydrocarbons and therefore valuable synthons for reactions in non-polar solvents. In this way unsymmetri-cally substituted derivatives MgRR'(L) become available by substituting one organic group by a different carbanion via acid-base reactions, according to eq. (1): R2Mg(L) + HR' -> RR'Mg(L) + HR (1) with HR' being stronger CH-acids than HR. Using the amin adducts R2Mg(L) (R = Me, Et) with chelating amines (L = tetramethyl­ ethylenediamine, TMED A, pentamethylethylenetriamine, PMDTA) and the strong CH-acids cyclopentadiene, indene, fluorene and alkynes the following compounds have been synthe­ sized and their structures derived by X-ray analyses: MgMe(?/3-cyclopentadienyl)(tmeda) (1), MgMe(?73-indenyl)(tmeda) (2), MgMe(^1-fluorenyl)(tmeda) (3), [Mg2Me2(pmdta)2]2+[fluo-renyl]2-benzene (4) and [Mg2Et(phenylethynyl)3(tmeda)]2-benzene (5). It is remarkable, that cyclopentadienyl, indenyl, and fluorenyl ligands have a lower hapticity than rj5 to the metal, due to steric repulsion by the other ligands. In 4 the bulky tridentate base PMDTA prevents any direct interaction between the fluorenide anion and magnesium, giving solvens separated ion pairs with the unusual and hitherto rare example of an organomagnesium cation [Mg2Me2(pmdt)2]2+. The 1:3 compound 5 has a more complicated structure, related to that of alkali metal alkynyl magnesates. 
  Reference    (Z. Naturforsch. 49b, 89—99 [1994]; eingegangen am 17. August 1993) 
  Published    1994 
  Keywords    Unsymmetrical Diorganomagnesium Compounds, Synthesis, Crystal Structure, Base Adducts, Chelating Di-and Triamines 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0089.pdf 
 Identifier    ZNB-1994-49b-0089 
 Volume    49 
57Author    H. Bocka, J. M. Eureta, J. W. Bats3, Z. HavlasbRequires cookie*
 Title    Strukturen sterisch überfüllter Moleküle, 39 [1,2] Einkristall-und Gasphasen-Strukturen von l,4-Bis(trimethylsiloxy)benzol Structures of Sterically Overcrowded Molecules 39 [1,2] Single Crystal and Gas Phase Structures o f l,4-Bis(trimethylsiloxy)benzene  
 Abstract    l,4-Bis(trim ethylsiloxy)benzene has been crystallized both by vacuum sublimation and from «-heptane solution, which each yielded colourless plates with identical monoclinic unit cell dim ensions (P 2 Jn, Z = 4). The conform ation o f C[ symmetry shows the two (H 3C)3SiO-substituents to be conrotationally twisted around the 0 -(C 6H4) -0 axis by dihedral angles o f ± 60°. According to the photoelectron spectroscopic ionisation pattern and its K oopm ans' as­ signment, IEV" = -e f MI, by AM 1 eigenvalues, the gas phase structure should also be o f C, symmetry. The results o f geometry-optimized M N D O , A M I or P M 3 calculations for the monosubstituted derivative H 5C6-O S i(C H 3)3 are compared with respect to the quality o f their fit to the measured data. Ausgangspunkt: Molekülkonformationen sterisch überfüllter 1,4-Benzol-Derivate 
  Reference    Z. Naturforsch. 49b, 288—2 (1994); eingegangen am 1. Oktober 1993 
  Published    1994 
  Keywords    Sterically Overcrowded Organosilicon M olecules, Single Crystal Structure, Photoelectron Spectroscopy, Quantum Chemical Calculations 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0288.pdf 
 Identifier    ZNB-1994-49b-0288 
 Volume    49 
58Author    Mitra Ghassemzadeh, Klaus Harms, Kurt Dehnicke, Jörg MagullRequires cookie*
 Title    //2-Chlorokomplexe von Succinimid und N-Chlorsuccinimid. Die Kristallstrukturen von PPh4[Cl(Succinimid)2], PPh4[[CI(N-Cl-Succinimid)2] und N-Chlorphthalimid /<2-Chloro Complexes of Succinimide and N-Chlorosuccinimide. The Crystal Structures of PPh4[Cl(Succinimide)2], PPh4[Cl(N-Cl-Succinimide)2] and N-Chlorophthalimide  
 Abstract    The donor-acceptor complexes PPh4[Cl(succinimide)2] and PPh4[Cl(N-chlorosuccinimide)2] have been prepared by reactions of PPh4Cl with succinimide and N-chlorosuccinimide, re­ spectively. in acetonitrile solutions. The complexes have been characterized by IR spectros­ copy and by crystal structure determinations. The crystal structure of N-chlorophthalimide has also been solved. 
  Reference    Z. Naturforsch. 49b, 506—512 (1994); eingegangen am 8. D ezem ber 1993 
  Published    1994 
  Keywords    /<2-Chloro Complexes of Succinimide, N-Chlorosuccinimide, FIR Spectra Crystal Structure 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0506.pdf 
 Identifier    ZNB-1994-49b-0506 
 Volume    49 
59Author    Mitra Ghassemzadeh, Klaus Harms, Kurt Dehnicke, Dieter FenskeRequires cookie*
 Title    //2-Halogenokomplexe von N-Bromsuccinimid und N-Bromphthalimid. Die Kristallstrukturen von PPh4[X(N-Bromsuccinimid)2] und von PPh4[X(N-Bromphthalimid)2] mit X = CI und Br /i2-Halogeno Complexes of N-Bromosuccinimide and N-Bromophthalimide. The Crystal Structures of PPh4 [X(N-Bromosuccinimide)2] and PPh4 [X(N-Brom ophthalim ide)2] with X = Cl and Br  
 Abstract    The ,«2-halogeno complexes PPh4[X(N-bromosuccinimide)2] and PPh4[X(N-bromophthali-mide)2] with X = Cl and Br have been prepared by reactions of N-bromosuccinimide and N-bromophthalimide, respectively, with the corresponding tetraphenylphosphonium halides PPh4X in acetonitrile solutions. The compounds form pale yellow crystal needles, which were characterized by IR spectroscopy and by crystal structure determinations. PPh4[Cl(N-Bromosuccinimide)2] (1): Space group Z = 4, structure solution with 2516 observed unique reflections, R = 0.040. Lattice dimensions at -2 5 °C: a = 1775.9(1), b = 764.3(1), c = 2341.7(2) pm, ß = 101.84(1)°. 
  Reference    Z. Naturforsch. 49b, 593—601 (1994); eingegangen am 22. Dezember 1993 
  Published    1994 
  Keywords    «2-Halogeno Complexes, N-Bromosuccinimide, N-Bromophthalimide, IR Spectra, Crystal Structure 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0593.pdf 
 Identifier    ZNB-1994-49b-0593 
 Volume    49 
60Author    Armin Weiss, Stefan DickRequires cookie*
 Title    Der zweikernige Fe(III)-Komplex von N,N,N',N'-Tetrakis(2-pyridylmethyl)-2-hydroxy-l,3-diaminopropan - Molekül-und Kristallstruktur und seine Wechselwirkung mit Montmorillonit The Binuclear Fe(III) Complex of N,N,N',N'-Tetrakis(2-pyridylmethyl)-2-hydroxy-l,3-diaminopropane - Molecular and Crystal Structure and its Interaction with Montmorillonite  
 Abstract    of [Fe2(H P T P)(0 H)(N 0 3)2](C104)2 (HPTP = N,N,N',N'-tetrakis(2-pyridyl-methyl)-2-hydroxy-l,3-diaminopropane) were grown by slow diffusion of diethylether into a solution of the complex salt in acetonitrile. Crystal data: space group R3, a = 4280,1(15) pm, c -1147,6(7) pm, Z = 18. The complex exhibits a binuclear Fe(III) core with (w-oxo)(//-alkoxo) ligands as bridging units. The nitrate anions coordinate each with a short and a long F e -O bond. The coordination spheres of the iron atoms can be looked at as distorted edge-shearing pentagonal bipyramides. The complex cation was introduced into the interlayer region of montmorillonite by cation exchange in acetonitrile. The results of X-ray, IR-and UV/VIS experiments suggest that the cation exchange is reversible. In the interlayer region the dinuclear cations are arranged in a rather loosely packed way, thus creating channels similar to those in pillared smectites or zeolites, respectively. 
  Reference    Z. Naturforsch. 49b, 1051—1058 (1994); eingegangen am 17. Januar 1994 
  Published    1994 
  Keywords    Binuclear Iron(III) Complex, Hem erythrin Model, Crystal Structure, Montmorillonite, Cation Exchange Reaction Yellow crystals 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-1051.pdf 
 Identifier    ZNB-1994-49b-1051 
 Volume    49 
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