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1997 (258)
81Author    R. Rettich, Hk Müller-BuschbaumRequires cookie*
 Title    Isolierte MnCl6-Oktaeder im Oxohalogeno-Vanadat Ba5(Mg0,4Mn0,6)(V2O7)2MnCl6 Isolated MnCl6 Octahedra in the Oxohalogeno Vanadate Ba5(M g0 4Mn0 6)(V20 7)2MnCl6  
 Abstract    Single crystals o f Ba5(M g0 4Mn0 6)(V20 7)2MnCl6 have been prepared by solid state reactions of M g C 0 3, Mn20 3, V20<i and BaCl2 -2H20 below the melting point of BaCl2. The new vanadium oxide chloride crystallizesowith monoclinic symmetry, space group C2h-P2/c, a = 13.345(4), b = 5.711(2), c = 15.859(4) Ä, ß = 113.69(2)°, Z = 2. Special features of the crystal structure are isolated MnCl6 octahedra and layers created by divanadat groups and (M g,M n)06 octahedra. The ^ [(Mg,Mn)V20 7] nets of Ba5(Mg0 4Mn0 6)(V20 7)2MnCl6 are discussed with respect to other oxohalogeno vanadates containing divanadate groups. 
  Reference    Z. Naturforsch. 52b, 457—461 (1997); eingegangen am 15. Januar 1997 
  Published    1997 
  Keywords    Barium, Magnesium, Manganese, Chlorine, Vanadium Oxide 
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 Identifier    ZNB-1997-52b-0457 
 Volume    52 
82Author    Peter Kaiser, Wolfgang JeitschkoRequires cookie*
 Title    Preparation and Crystal Structures of the Ternary Compounds Ag2SiP2 and AuSiP  
 Abstract    The title compounds were prepared by solid state reaction of the elemental components. Their crystal structures were determined from single-crystal X-ray diffractometer data. Ag2SiP2: 142d, a = 652.75(5) pm, c = 855.0(1) pm, Z = 4, R = 0.024 for 611 structure factors and 14 variable parameters; AuSiP: R3m, a = 345.9(1) pm, c = 1720.0(3) pm, Z = 3, R = 0.023 (352 F values, 11 variables). The silicon atoms in Ag2SiP2 are tetrahedrally coordinated by phosphorus atoms. The compound might therefore be considered as a phosphidosilicate and its formula can be rationalized as (Ag+l)2Si+4(P_3)2. However, Ag2SiP2 is not a tetrahedral compound since the phosphorus atoms have five near neighbors (3Ag + 2Si) and the silver atoms are coordinated by three phosphorus atoms in almost trigonal planar coordination. Weak silver-silver bonding is assumed for the shortest Ag-Ag contacts of 318 pm. In AuSiP the gold atoms are in a linear coordination of one silicon (235.5 pm) and one phosphorus atom (232.6 pm). The silicon and phosphorus atoms are tetrahedrally coordinated (3Si + 1 Au and 3P + 1 Au, respectively). Thus, the elements can be assigned oxidation numbers according to the formula Au+lSi+2P-3 . This structure was also refined in the centrosymmetric space group R3m, but in this improper setting the silicon and phosphorus atoms occupy one crystallographic site with random occupancy. 
  Reference    Z. Naturforsch. 52b, 462 (1997); received September 13 1996 
  Published    1997 
  Keywords    Crystal Structure, Two-Electron Bonds, Zintl Compounds 
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 Identifier    ZNB-1997-52b-0462 
 Volume    52 
83Author    AnnemarieL W Essels, Wolfgang Jeitschko, ManfredH. MöllerRequires cookie*
 Title    Preparation and Crystal Structure of Hg9As4O i6, a Mercury Arsenate(V) with Triangular Hg34+ Cations  
 Abstract    Crystal Structure, Mercury Arsenate(V), Triangular H g34+ Cations The new compound H ggAsjO^ has been prepared by thermal decomposition o f the mer-cury(I) arsenate(V) (Hg2)3(As04)2 in the presence of HgO in an evacuated, sealed silica tube. It crystallizes with a rhombohedral structure (R3c, Z = 6), which has been determined from two single-crystal diffractometer data sets collected at 295 K (a = 1665.3(1) pm, c = 1083.8(1) pm, R = 0.051 for 2353 structure factors and 62 variable parameters) and 170 K (a = 1660.3(2) pm, c = 1083.0(1) pm, R = 0.037 for 1681 F-values). It corresponds to the formula (Hg34+)3(As0 4 3_)4 with almost equilateral mercury triangles and nearly perfect ASO4 tetrahedra. The average Hg-Hg bond distance of 267.5 pm is considerably greater than the average Hg-Hg distance of 251.3 pm round in mercury(I) compounds, reflecting the atoms. 
  Reference    Z. Naturforsch. 52b, 469—473 (1997); received October 24 1996 
  Published    1997 
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 Identifier    ZNB-1997-52b-0469 
 Volume    52 
84Author    Andreas Lenz, Christoph Schmidt, AnnetteBarbara Lehmann, Wagner, Wolfgang BeckRequires cookie*
 Title    Ein-und zweikernige Palladium-und Platin(II)-Chelat-Komplexe mit dem Mono-und Dianion von Indigo und Indigoderivaten Metal Complexes o f D yes, VIII [1 ] Mono-and Dinuclear Palladium and Platinum (II) Chelate Complexes of the Mono-and Dianion o f Indigo and Derivatives thereof  
 Abstract    A series of mono and bis N,O-chelate complexes 1-32 with the mono and dianion of indigo and indigo derivatives (R3P)(C1)M(L-H+) (M = Pd.Pt), (r/3-allyl)Pd(L-H+), (PhiC=NCH->CO->Et-H+)Pd(L-H+), (PhN=NPh-H+)Pd(L-H+), (Q H 5)Fe(C5H3CH2NMe2)Pd(L-H+), [(R3P)(Cl)Pt]2(L-2H+), [(//3-allyl)Pd]2(L-2H+), [(C6H4CH2N M e2)Pd]2(L-2H+) with L = indigo, 4,4'-dichloro-, 6,6'-dichloro-, 6,6'-dibromo-, 6,6'-di-»Bu-, 4,4'-dichloro-, 5.5'dibromo-, 5,5', 6,6'-tetramethoxy-, 4.4'-di-S]2H25-, 5,5'-di-SO?Na-indigo, indigo malonic ester and tetrahydro indigo have been prepared from chloro bridged metal complexes. In comparison to the free neutral indigo ligands the complexes show a high bathochromic shift in the VIS spectra (150-300 nm) which is mainly due to the anionic character of the coordinated indigo ligands. The structure of [(Et3P)(Cl)Pt]2(indigo-2H+) has been determined by X-ray diffraction. Metallkomplexe von Farbstoffen, VIII [1] 
  Reference    Z. Naturforsch. 52b, 474—484 (1997); eingegangen am 8. November 1996 
  Published    1997 
  Keywords    Indigo, Indigo Derivatives, Palladium, Platinum 
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 Identifier    ZNB-1997-52b-0474 
 Volume    52 
85Author    Teodor Silviu Balabana ', NinaG. FurmanovabRequires cookie*
 Title    7T-7T Interactions between Pyrylium and Phenyl Rings in the Crystal  
 Abstract    The crystal structures of two isomeric phenyl-substituted pyrylium perchlorates, 2,6-di-methyl-4-phenylpyrylium (1) and 2,4-dim ethyl-6-phenylpyrylium (2), have been determined. Both cations are planar in the crystal so that the electron deficient pyrylium rings can interact strongly with the phenyl rings of adjacent molecules forming stacks along the shortest crys-tallographic axis. The phenyl rings may act as donors in a charge transfer interaction which is more pronounced in 1 than in 2. Charge transfer appears as a non-mandatory consequence of the 7T-7T stacking. The structures demonstrate the electrostatic nature of these interactions conforming to the model of Hunter and Sanders [ 1 ]. 
  Reference    Z. Naturforsch. 52b, 485 (1997); received January 13 1997 
  Published    1997 
  Keywords    Pyrylium Salt, Crystal Engineering, Charge Transfer, Crystal Structure 
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 Identifier    ZNB-1997-52b-0485 
 Volume    52 
86Author    Stefan Horstmann, Wolfgang SchnickRequires cookie*
 Title    Synthese, Kristallstruktur und Eigenschaften von 1,1,3,3,3-Pentaamino- l-th io -l A \3 A 5-diphosphaz-2-en (NH2)2P(S)N=P(NH2)3 Synthesis, Crystal Structure, and Properties of 1,1,3,3,3-Pentaam ino-l-thio-l A5,3A5-diphosphaz-2-ene (N H 2)2P(S)N =P(NH 2)3  
 Abstract    (NH2)2P(S)N=P(NH2)3 has been prepared by a two step synthesis. Suitable single crystals were obtained from an acetonitrile solution in a temperature gradient between 60 °C and room temperature. The crystal structure of (NH->)tP(S)N=P(NH->)3 has been determined by single cry­ stal X-ray methods (P2,/c, a = 9 9 8 .2 7 (9)> '= 762.78(8), c = 1007.70(15) pm, ß = 107.340(7)°, Z = 4). In the crystal structure each hydrogen atom is subject to a hydrogen bond. Four N-H -N hydrogen bonding interactions per molecule build up a framework connecting two molecules in eight-membered rings. Each sulfur atom shows six distances N -H -S in the range of weak hydrogen bonding interactions. 
  Reference    Z. Naturforsch. 52b, 490—95 (1997); eingegangen am 18. Dezember 1996 
  Published    1997 
  Keywords    Aminophosphazenes, Synthesis, Crystal Structure, Hydrogen Bonding 
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 Identifier    ZNB-1997-52b-0490 
 Volume    52 
87Author    M. Enders, R. Rudolph, H. PritzkowRequires cookie*
 Title    Synthese und Kristallstruktur von Pentakis(dimethylsulfoxid)- oxo-titan(IV)chlorid Synthesis and Crystal Structure o f Pentakis(dimethylsulfoxide)-oxo-titanium(IV) Chloride  
 Abstract    Pentakis(dimethylsulfoxide)-oxo-titanium(IV) chloride is obtained by reaction of titanium tetrachloride with a stoichiometric amount of water in dimethylsulfoxide. A single crystal structure determination (P i, a = 9.564(6), b = 10.504(7), c = 12.510(8) A. a = 70.21(5), ß = 83.48(5), 7 = 89.82(5)°, V = 1174 Ä 3, Z = 2) shows a dicationic titanium(IV) complex with five dimethylsulfoxide ligands and one oxygen atom. The two chlorine anions are not bonded to the complex cation. The T i0 6-fragment is a distorted octahedron, where five of the six oxygen atoms belong to the coordinated dimethylsulfoxide molecules. 
  Reference    Z. Naturforsch. 52b, 496—499 (1997); eingegangen am 23. Dezember 1996 
  Published    1997 
  Keywords    Titanium Oxo Complexes, Dimethylsulfoxide, Crystal Structure 
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 Identifier    ZNB-1997-52b-0496 
 Volume    52 
88Author    S.Requires cookie*
 Title    Silaheterocyclen, XXXIII [1, 2]: Cycloadditions-Reaktionen des 1.1-Dichlor-2-neopentyIsilaethens mit Pentafulvenen  
 Abstract    ilaheterocycles, X X X III [1, 2]: C y c lo a d d itio n R e a c tio n s of 1 .1 -D ic h lo ro -2 -n eo p e n ty lsilen e w ith P e n ta fu lv e n e s N o rb e rt A u n er* , C la u s-R ü d ig e r H e ik e n w ä ld e r The reaction between in situ formed l,l-dichloro-2-neopentyl-l-silene, Cl2Si=CHCH2rBu (2), and 1,1-dimethylpentafulvene (5) leads to the formation of exo/endo-isomeric [4+2] cy-cloadducts 9 and [2+2] stereoisom ers 10 in good yields. NMR spectroscopic investigations of the product mixture prove the different modes of the silene cycloaddition reactions ([4+2] vs [2+2] addition). Treatment of 9 and 10 with LiA lH 4 and LiMe yield the stereo-and regioisomeric derivati­ ves (LiAlH 4: 16. 17; MeLi: 18, 19), whereas PhMgBr reacts with 10 to give only the mono substitution, the [4+2] com pound 20, and the diphenylated silacyclobutane 21. The reactions of silene 2 with pentafulvenes 6 -8 lead to similar results. 
  Reference    Z. Naturforsch. 52b, 500—514 (1997); eingegangen am 19. Dezember 1996 
  Published    1997 
  Keywords    Cycloaddition Reactions, Neopentylsilene, Pentafulvenes, NMR Spectra 
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 Identifier    ZNB-1997-52b-0500 
 Volume    52 
89Author    Requires cookie*
 Title    Wechselwirkungen in Kristallen, 112 [1] Tetra(2-pyridyl)pyrazin -ein vielseitiger Ligand für Lewis-Säuren: Halb-und doppelschalige Komplexe von Kupfer(II)-und Nickel(II)-Salzen  
 Abstract    In te ra c tio n s in C rystals, 112 [1] 
  Reference    Z. Naturforsch. 52b, 515 (1997) 
  Published    1997 
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 Identifier    ZNB-1997-52b-0515 
 Volume    52 
90Author    Requires cookie*
 Title    Wechselwirkungen in Molekülkristallen, 126 [1,2] Die Kationen-Solvatation in solvens-umhüllten und solvens-getrennten Ionen- Multipeln von 1,2,3,4-Tetraphenylcyclopentadienyl-Natrium-Salzen  
  Reference    Z. Naturforsch. 52b, 524 (1997) 
  Published    1997 
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 Identifier    ZNB-1997-52b-0524 
 Volume    52 
91Author    Requires cookie*
 Title    ab /m7/tf-Rechnungen zur Tautomerie, Acidität und Basizität von 1-MethyI- pyrazolin-2-on-5 und seinen Schwefel und Selen Analogen  
  Reference    Z. Naturforsch. 52b, 535 (1997) 
  Published    1997 
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 Identifier    ZNB-1997-52b-0535 
 Volume    52 
92Author    Z. NaturforschRequires cookie*
 Title    Synthese und Kristallstruktur von [Se3N2Cl]+SbCl6  
 Abstract    Chloro-Cycloselenazenium Hexachloroanti-monate(V), Synthesis, Crystal Structure [Se3N2Cl]+SbCl6~ has been prepared as red crystals by the reaction of the nitride chloride Se2NCl5 with antimony(III) chloride in dichloro­ methane. It was characterized by a crystal struc­ ture determination. Space group PI, Z = 2, 4396 observed unique reflections, R = 0.030. Lattice di­ mensions at -80 °C: a = 698.2, b = 699.7, c = 1510.5 pm, a = 89.45°, ß = 86.18°, y = 68.22°. The struc­ ture consists of two symmetry-independent ca­ tions and two symmetry independent anions, which differ only slightly from each other. The cations contain Se3N2 five-membered rings, which deviate very little from planarity as shown by fol­ ding angles of 14° and 18°. The Se-N bond distan­ ces are between 171.4 and 176.4 pm suggesting double-bond constituents. 
  Reference    Z. Naturforsch. 52b, 543—545 (1997); eingegangen am 8. Januar 1997 
  Published    1997 
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 Identifier    ZNB-1997-52b-0543_n 
 Volume    52 
93Author    Ch Rabbow, S. Panzer, H.K M Üller-, Busch-BaumRequires cookie*
 Title    Röntgenstrukturanalyse von zwei Verbindungen des  
 Abstract    Kupfertyps BaMLn20 5 (M = Zn, Ln = Sm, Tm) und von BaSmAIZn30 7 X -R ay A nalysis of Two C om pounds of the C o p p er Type B aM L n20 5 (M = Z n, Ln = Sm, Tm) and of B aS m A lZ n 30 7 The barium zinc lanthanoide oxides BaZnSm20 5 (I) and BaZnTm20 5 (II) crystallize in the BaCuLn20 3 copper type with orthorhom­ bic symmetry, space group D^-Pnma, (I): a = 12.575(2), b = 5.804(1), c = 7.198(1) A and (II): a = 12.258(2), b = 5.684(1), c = 7.010(2) A, Z = 4. Zinc shows square pyramidal oxygen coordina­ tion, but the strong elongation of the C u 0 5 pyra­ mid in the copper type is missing. BaSmAlZn30 7 crystallizes in the space group C6V -P63mc, a = 6.346(1), c = 10.237(3) Ä, Z = 2. The metal coordi­ nation of oxygen and the shifts of the ratio Al : Zn at the sites (6c) and (2a) depending on the size of the lanthanoid ions are discussed. 
  Reference    Z. Naturforsch. 52b, 546—548 (1997); eingegangen am 30. Dezember 1996 
  Published    1997 
  Keywords    Barium, Rare Earth, Zinc, Aluminium, Oxide, Crystal Structure 
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 Identifier    ZNB-1997-52b-0546_n 
 Volume    52 
94Author    S. Meyer, Hk Müller-BuschbaumRequires cookie*
 Title    Kantenverknüpfte V 0 6-0ktaeder und P 0 4-Tetraeder in BaC a(V 0)(P04)2 Edge-Connected V 0 6 Octahedra and P 0 4 Tetrahedra in BaCa(V0)(P04)2  
 Abstract    Single crystals of the new compound BaCa(V0)(P04)2 have been prepared by solid state reactions below the melting point of the reactants in evacuated quartz tubes. X-ray investigations led to monoclinic symmetry, space group C2h-P2 i/c, a = 7.300(1), b = 7.053(1), c = 14.460(1) A, ß = 101,43(1)°, Z = 4. The crystal structure is characterized by layers of corner-and edge-connected P 0 4 tetrahedra and VO,+5 octahedra. There is an unusually short 0 (1)-0(4) distance in a V 0 6 octahedron of 2.44 A associated with the sharing of edges with P 0 4 tetrahedra. The short V-0 distance of 1.61 A indicates a vanadyl group. 
  Reference    Z. Naturforsch. 52b, 549—552 (1997); eingegangen am 25. Februar 1997 
  Published    1997 
  Keywords    Barium, Zinc, Vanadium Phosphate, Crystal Structure 
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 Identifier    ZNB-1997-52b-0549 
 Volume    52 
95Author    O. Sfreddo, Hk Müller-BuschbaumRequires cookie*
 Title    Geschlossene ^ [(PtDy4O i6)4]-Polyedertunnel in Ba13Dy8Zn4Pt4037 Closed ^ [(PtDy40 16)4] Polyhedra Tunnels in Ba13Dy8Zn4Pt40 37  
 Abstract    Single crystals of Bai3Dy8Zn4Pt40 37 have been prepared by reaction of mixtures of BaC03, ZnO and Dy20 3 at temperatures up to 1225 °C using platinum crucibles. X-ray investigations led to a new crystal structure with tetragonal symmetry, space group C4h-I4/m, a = 18.659(7), c = 5.734(2) A, Z = 2. The structure is characterized by P t0 6 and B a06 octahedra as well as by tetragonal Z n 0 5 pyramids and single capped trigonal prisms of oxygen around dysprosium. The remaining barium positions show coordination numbers of nine and ten. The crystal structure has large ^ [(PtDy40)6)4] polyhedra tunnels. Considering the 1 [Ln4O l6]20_ polyhedra groups some parts of the structure show similarities to BaZnLn20 5, B a ^ n 4Ln8Ö2i and Ba2Ln2ZnPt08. 
  Reference    Z. Naturforsch. 52b, 553—556 (1997); eingegangen am 6. März 1997 
  Published    1997 
  Keywords    Barium, Rare Earth, Zinc, Platinum, Oxide 
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 Identifier    ZNB-1997-52b-0553 
 Volume    52 
96Author    Tristram Chivers, Masood Parvez, Peter ZoricakRequires cookie*
 Title    Preparation and X-Ray Structure of 4-BrC6H4CNSC(Cl)N  
 Abstract    The title compound was obtained in 82% yield by the intramolecular cyclization of 4-BrC6H4C(NSCCl3)[N(SiMe3)2] in CH2CI2 at 23°C. It crystallizes in the triclinic system, space group PI, a = 7.957(3) Ä, b = 10.864(5) A, c = 5.625(1) A, a = 95.94(3)°, ß = 97.79(2)°, 7 = 100.72(3)°, V = 469.2(3) A3, and Z -2. The bond lengths of the planar C2N2S ring indicate partial 7r-delocalization. 
  Reference    Z. Naturforsch. 52b, 557—559 (1997); received September 5 1996 
  Published    1997 
  Keywords    Crystal Structure, 1, 2, 4-Thiadiazole, Intramolecular Cyclization 
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 Identifier    ZNB-1997-52b-0557 
 Volume    52 
97Author    AndreT. Nientiedt, Wolfgang Jeitschko, PeterG. Pollmeier, Markus BrylakRequires cookie*
 Title    Quaternary Equiatomic Manganese Pnictide Oxides AMnPO (A = La-Nd, Sm, Gd-Dy), AMnAsO (A = Y, La-Nd, Sm, Gd-Dy, U), and AMnSbO (A = La-Nd, Sm, Gd) with ZrCuSiAs Type Structure  
 Abstract    Crystal Structure, Quaternary Pnictide Oxides The 24 title compounds were prepared in well crystallized form by reaction of the rare earth elements (or uranium, respectively), manganese, the pnictide components, and MnO: in a NaCl/KCl flux. They crystallize with the tetragonal ZrCuSiAs type structure (P4/nmm, Z = 2), which has been refined from single-crystal X-ray data of NdMnPO (a = 398.9(1), c = 867.4(1) pm, R = 0.026), NdMnAsO (a = 404,9(2), c = 889.3(4) pm, R = 0.025), and NdMnSbO (a = 416.5(1), c = 946.2(2) pm, R = 0.021) for 107, 190, and 124 structure factors, respectively, and 11 variable parameters each. Chemical bonding in these compounds is briefly discussed. 
  Reference    Z. Naturforsch. 52b, 560—564 (1997); received December 17 1996 
  Published    1997 
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 Identifier    ZNB-1997-52b-0560 
 Volume    52 
98Author    X. =. Cl, I. V. Br, W. Lorenzen, PreetzRequires cookie*
 Title    Kristallstrukturen von Oi-Bu4N)  
 Abstract    [B6C16], (w-Bu4N)[B6Br6] und (Ph3P=N=PPh3)[B6I6] sowie Schwingungsspektren und Normal-koordinatenanalyse der Hexahalogeno-c/osö-Hexaboratradikal-anionen [B6X6]~, X = Cl, Br, I Crystal Structures of («-Bu4N)[B6C16], (rc-Bu4N)[B6Br6], and (Ph3P=N=PPh3)[B6I6], and Vibrational Spectra and Normal Coordinate Analysis of the Hexahalogeno-c/oso-hexaborate Radical Anions [B6X6]-, Oxidation of hexahalogeno-c/oso-hexaborates [B6X6]2_, X = Cl, Br, I, with (NH4)2[Ce(N03)6] in ethanol yields coloured radical ions [B6X6]~. X-ray structure determina­ tions have been performed on single crystals of («-Bu4N)[B6Cl6] (1) (monoclinic, space group P2,/c,a = 13.144(2),6 = 12.594(2),c = 17.688(5) A,ß = 107.29(2)°,Z=4),(«-B u4N)[B6Br6] (2) (monoclinic, space group P2,/c, a = 13.529(5), b = 13.096(5), c = 17.863(5) Ä, ß = 107.20(5)°, Z = 4) and (Ph3P=N=PPh3)[B6I6] (3) (triclinic, space group P I, a = 9.3137(8), b = 10.6988(10), c = 11.8760 A, a = 102.220(7), ß = 99.34J(8), 7 = 96.030(7)°, Z = 1). The average B-B distan­ ces are nearly equal (1.733 Ä (1), 1.728 A (2), 1.728 A (3)) while the B-X distances increase (1.762 A (1), 1.912 A (2), 2.120 A (3)). Using the molecular parameters, normal coordinate analyses have been performed and a good agreement of observed and calculated frequencies of 11B and 1 'B labelled derivatives has been achieved. The valence force constants fd(BB) and fd(BX) of [B6X6]" are 1.17 and 4.17 (X = Cl), 1.18 and 3.34 (Br) and 1.18 and 2.60 mdyn/A (I), respectively. 
  Reference    Z. Naturforsch. 52b, 565—572 (1997); eingegangen am 19. Februar 1997 
  Published    1997 
  Keywords    Hexahalogenohexaborates( 1 -), Crystal Structure, Vibrational Spectra, Normal Coordinate Analysis 
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 Identifier    ZNB-1997-52b-0565 
 Volume    52 
99Author    Herbert Schumann, Alexander Lentz, Roman WeimannRequires cookie*
 Title    Synthese und Röntgenstrukturanalyse von [Fe(r?6-C6H4{l,3-(CH3)2})(»7s -Cs(C6H5)5]+ [FeCI4]' Synthesis and X-Ray Structure Analysis of [Fe(f76-C6H4{1 ,3 -(C H 3)2})(T75-C 5(C 6H 5)5]+ [FeCl4]  
 Abstract    Iron, Ferrocene, Xylene Complex Fe[C5(C6H5)5](CO)2Br (1) reacts with m-xylene at 80°C followed by hydrolysis with diluted HC1 in the presence of air, to give [Fe(7?6-C6H4{l,3-(CH3)2})(775-C5(C6H5)5)]+[FeCl4]_ (3). The 'H, i3C NMR and mass spectra as well as the single crystal X-ray diffraction analysis confirm the proposed sandwich cation structure. 3 crystallizes in the space group P 2|In with a = 984,0(1), b = 2201,0(7), c = 1684,9(2) pm, ß = 91,94(1)° and V = 3647(1) x 10~30 m3. The final refinement resulted in R = 0,054 for 2982 
  Reference    Z. Naturforsch. 52b, 573—576 (1997); eingegangen am 21. Januar 1997 
  Published    1997 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0573.pdf 
 Identifier    ZNB-1997-52b-0573 
 Volume    52 
100Author    Wolfram Uhlig, HerrnRequires cookie*
 Title    Funktionalisierung und Vernetzung von Poly(silylenmethylenen) Functionalization and Cross-Linking of Poly(silylenemethylenes)  
 Abstract    Functionalized 1,3-disilacyclobutanes (RSiX-CH2)2 have been prepared by protodesilylation of aminosubstituted 1,3-disilacyclobutanes with triflic acid and by conversions with nucleo­ philes. The ring-opening polymerisations of these compounds lead to novel high molecular weight poly(silylenemethylenes), which are characterized by a linear structure and alternating silicon and carbon atoms in the main chain. The hydrosilylation reaction between the po-ly(silylenemethylenes) (RSiH-CH2)n and (RSiVi-CH2)n results in a polymer network which may serve as an interesting preceramic material. The structures of the polymers were proven by NMR spectroscopy (29Si, 13C, 'H). 
  Reference    Z. Naturforsch. 52b, 577—586 (1997); eingegangen am 5. Februar 1997 
  Published    1997 
  Keywords    Poly(silylenemethylenes), Silyltriflates, Disilacyclobutanes, Ring-opening Polymerization 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0577.pdf 
 Identifier    ZNB-1997-52b-0577 
 Volume    52 
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