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  • 1
    Electronic Resource
    Electronic Resource
    On the way to sol–gels: an analysis of the intra- and intermolecular hydrogen bonding in [Ba(OH)I(H2O)4] (2000)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. 1179-1180 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: We have been able, via a new synthetic route, to obtain a complete crystal structure of the title compound, tetraaquabarium hydroxide iodide, [Ba(OH)I(H2O)4], for which the heavy atoms only were characterized by Kellersohn, Beckenkamp & Lutz [Z. Naturforsch. Teil B (1991), 46, 1279–1286]. In the present results, the H-atom positions could be located using X-ray data collection at low temperature. A three-dimensional network is built up via hydrogen bonds. It was also observed that the title compound undergoes hydrolysis and might therefore be regarded as an intermediate in the formation of sol–gels, starting from BaI2 and leading to [Ba(OH)2(H2O)x].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270100009586
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  • 2
    Electronic Resource
    Electronic Resource
    Highly Stereoselective Synthesis of Bicyclo[n.3.0]alkanes by Titanium Tetrachloride Promoted [3 + 2] Cycloaddition of Allylsilanes and 1-AcetylcycloalkenesCycloadditions of Allylsilanes, part 9. Part 8: H.-J. Knölker, P. G. Jones, R. Graf, Synlett 1996, 1155. (1997)
    Weinheim : Wiley-Blackwell
    Chemistry - A European Journal 3 (1997), S. 538-551 
    Details
    ISSN: 0947-6539
    Keywords: allylsilanes ; diastereoselective synthesis ; bicycloalkanes ; cycloadditions ; enones ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The titanium tetrachloride promoted reaction of allylsilanes 1 with 1-acetylcyclohexene is shown to afford the silylbicyclo[4.3.0]nonanes 9 ([3 + 2] cycloaddition products) along with the 1-acetyl-2-allylcyclohexane 4 (Hosomi-Sakurai product). Here we report that systematic variation of the substituents at the silicon atom of 1 allows suppression of the classical Hosomi-Sakurai reaction in favor of the [3 + 2] cycloaddition. Cycloaddition of the allylsilanes 1 d, 1 i, and 1 k with 1-acetylcycloalkenes 10, containing a 5-, 6-, 7-, 8-, or 12-membered ring, gives rise to the corresponding silylbicyclo[n.3.0]alkanes 11 - 13. The cycloaddition of allyltriisopropylsilane (1 k) and 1-acetyl-2-methylcycloalkenes 15 provides silylbicyclo[n.3.0]alkanes 16 with two contiguous quaternary carbon centers. The stereochemistry of the silylbicyclo[n.3.0]alkanes 11 a - c and 14 is unambiguously determined by X-ray analysis and 13C NMR spectroscopy.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chem.19970030409
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesis, Molecular Structure, Fluxional Behavior, and Tricarbonyliron Transfer Reactions of (η4-1-Azabuta-1,3-diene)tricarbonyliron Complexes (1998)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1998 (1998), S. 993-1007 
    Details
    ISSN: 1434-1948
    Keywords: Azabutadienes ; Tricarbonyliron complexes ; Transfer reagents ; Molecular structure ; Fluxionality ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The (η4-1-azabuta-1,3-diene)tricarbonyliron complexes 10 are easily prepared in high yield by condensation of the corresponding arylamines 7 with the cinnamaldehydes 8 and subsequent ultrasound-promoted complexation of the resulting 1-azabuta-1,3-dienes 9 with nonacarbonyldiiron. The complexes 10 are shown to represent excellent reagents for the transfer of the tricarbonyliron fragment onto cyclohexa-1,3-diene (1a). The structural characterization for the complexes 10 is achieved by IR, 1H-NMR, and 13C-NMR spectroscopy, as well as X-ray crystallography of 10b, 10c, and 10l. Using variable temperature 13C-NMR spectroscopy the fluxionality of the complexes 10a, 10b, 10c, 10e, and 2 is investigated and the activation barrier for the turnstile rotation of the tricarbonyliron fragment is determined. The transfer reaction and the structural factors influencing the transfer of the tricarbonyliron fragment are extensively investigated.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Tetrakis(dimethylamino)ethen-Dikation: Zwei durch eine CC-Einfachbindung verknüpfte, gegeneinander verdrillte ((CH3)2N)2C⊕-Carbenium-IonenProfessor Edgar Heilbronner gewidmetStrukturen gestörter π-Systeme, 2. Mitteilung, und Elektronentransfer und Ionenpaar-Bildung, 13. Mitteilung. Diese Arbeit wurde von der Deutschen Forschungsgemeinschaft, dem Fonds der Chemischen Industrie und dem Land Hessen gefördert. - 1. Mitteilung: H. Bock, H.-F. Herrmann, D. Fenske, H. Goesmann, Angew. Chem. 100 (1988) 1125; Angew. Chem. Int. Ed. Engl. 27 (1988) 1067; 12. Mitteilung: H. Bock, H.-F. Herrmann, J. Am. Chem. Soc. 111 (1989) 7022. (1989)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 101 (1989), S. 1715-1717 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19891011222
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  • 5
    Electronic Resource
    Electronic Resource
    Strukturen sterisch überfüllter oder ladungsgestörter Moleküle. 9. Tetracyanethen-Kalium-DimethoxyethanProfessor Kurt Dehnicke zum 60. Geburtstage gewidmet (1991)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 595 (1991), S. 275-284 
    Details
    ISSN: 0044-2313
    Keywords: Tetracyano radical anion salt ; single crystal structure ; MNDO calculations ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structures of Sterically Overcrowded or Charge Perturbed Molecules. 9. Tetracyanoethylene Potassium DimethoxyethaneThe single crystal structure of [(NC)2C=C(CN)2 ⊖K⊕(H3CO—CH2CH2—OCH3)] reveals 4 formula units per monoclinic (P21/n) unit cell. The tetracyanoethylene radical anions are stapled within slightly undulated layers exhibiting alternating average intermolecular distances of 315 pm and 360 pm between their central C=C bonds. In- between the closer layers both are interspersed the eight-fold coordinated K⊕ counter cations and the solvating dimethoxyethane molecules with contact distances K⊕…N of 282 to 306 pm and K⊕…O of 279 to 294 pm. The molecular halves of the radical anions (NC)2C=C(CN)2⊖ are twisted by 12° and the C=C, C—C and C≡N bond length amount to 142, 142, and 114 pm, respectively. These structural features are discussed by comparison with those of analogous cyanohydrocarbon salts, with those of the neutral molecule, its largely interaction-free anion and its dianion as well as with results of geometry-optimized MNDO calculations.
    Notes: Die Einkristallstruktur von [(CN)2C=(CN)2 ⊖K⊕(H3CO—CH2CH2—OCH3)] belegt vier Formeleinheiten in der monoklinen (P21/n) Einheitszelle. Die Tetracyanethen-Radikalanionen finden sich in leicht gewellten Schichten gestapelt, welche alternierende mittlere intermolekulare Abstände von 315 pm und 360 pm zwischen den zentralen C=C-Bindungen aufweisen. Zwischen den Schichten mit kürzerem Abstand sind die achtfach koordinierten K⊕-Gegenkationen und die Dimethoxyethan-Solvatmoleküle mit Kontaktabständen K⊕…N zwischen 282 pm und 306 pm sowie K⊕…O zwischen 279 pm und 294 pm eingelagert. Die beiden Molekülhälften der Radikalanionen (NC)2C=C(CN)2⊖ sind um 12° gegeneinander verdrillt und die Bindungslängen C=C, C—C und C≡N betragen 142, 142 und 114 pm. Diese Strukturparameter werden durch Vergleich mit denen ähnlicher Cyankohlenwasserstoff-Salze, denen des Neutralmoleküls und seines weitgehend wechselwirkungsfreien Radikalanions und Dianions sowie anhand der Ergebnisse geometrieoptimierter MNDO-Berechnungen diskutiert.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19915950125
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  • 6
    Electronic Resource
    Electronic Resource
    Trimethylsilyl-substituierte Amidinatokomplexe von Thallium(III). Die Kristallstruktur von [Ph—C(NHSiMe3)2] [Ph—C(NSiMe3)2 TICI3]Herrn Professor Eberhard Hoyer zum 60. Geburtstage am 26. Mai 1991 gewidmet (1991)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 600 (1991), S. 7-14 
    Details
    ISSN: 0044-2313
    Keywords: Amidinato complexes of thallium(III) ; syntheses ; i.r. spectra ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Trimethylsilyl Substituted Amidinato Complexes of Thallium(III). The Crystal Structure of [Ph—C(NHSiMe3)2] [Ph—C(NSiMe3)2TlCl3]The amidinato complexes [Ph—C(NSiMe3)2TlCl3] and [Ph—C(NHSiMe3)2] [Ph—C(NSiMe3)2TlCl3] have been prepared by the reaction of TlCl3 with N,N,N′-tris(trimethylsilyl)benzamidine in THF solution. They were characterized by IR spectroscopy, [Ph—C(NHSiMe3)2] [Ph—C(NSiMe3)2TlCl3] additionally by an X-ray structure determination. Space group P21/c, Z = 4, 4300 observed unique reflexions, R = 0.053. Lattice dimensions at -43°C: a = 1157.2, b = 2346.3, c = 1536.9 pm, β = 105.98°. The structure consists of amidinium cations, and of anions [Ph—C(NSiMe3)2TlCl3]-, in which the thallium atom is fivefold surrounded by three chlorine atoms and by two nitrogen atoms of the amidinato chelate.
    Notes: Die Amidinatokomplexe [Ph—C(NHSiMe3)2TlCl2] und [Ph—C(NHSiMe3)2TlCl2] [Ph—C(NSiMe3)2TlCl3] entstehen bei der Einwirkung von Thallium(III)-chlorid auf N,N,N′-Tris(trimethylsilyl)benzamidin in Tetrahydrofuranlösung. Sie werden durch ihre IR-Spektren, und [Ph—C(NHSiMe3)2] [Ph—C(NSiMe3)2TlCl3] zusätzlich durch eine Kristallstrukturanalyse charakterisiert. Raumgruppe P21/c, Z = 4, 4300 unabhängige beobachtete Reflexe, R = 5,3%. Die Gitterkonstanten betragen bei -43°C: a = 1157,2; b = 2346,3; c = 1536,9 pm; β = 105,98°. Die Verbindung besteht aus einem Amidiniumkation und einem [Ph—C(NSiMe3)2TlCl3]--Anion, in dem das Thalliumatom verzerrt trigonal-bipyramidal von drei Cl-Atomen und chelatartig von den beiden N-Atomen des Amidinatoliganden umgeben ist.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19916000102
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  • 7
    Electronic Resource
    Electronic Resource
    Phosphaniminato-Komplexe des Antimons. Die Kristallstrukturen von [Sb2Cl5(NPMe3)2][SbCl6] · CH3CN und [SbCl(NPPh3)]2[SbCl6]2 · 6 CH3CN (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 592-598 
    Details
    ISSN: 0044-2313
    Keywords: Phosphorane Iminato Complexes of Antimony ; 121Sb Mössbauer Spectra ; Crystal Structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Phosphorane Iminato Complexes of Antimony. The Crystal Structures of [Sb2Cl5(NPMe3)2][SbCl6] · CH3CN and [SbCl(NPPh3)]2[SbCl6]2 · 6 CH3CNThe title compounds are formed by reaction of antimony pentachloride in acetonitrile solution with the phosphorane iminato complexes SbCl2(NPMe3) and SbCl2(NPPh3), respectively, which themselves are synthesized by reaction of antimony trichloride with Me3SiNPR3 (R = Me, Ph). The complexionic compounds are characterized by 121Sb Mössbauer spectroscopy and by crystal structure determinations.[Sb2Cl5(NPMe3)2][SbCl6] · CH3CN: Space group P41, Z = 4, 3 698 observed unique reflections, R = 0.022. Lattice dimensions at -60°C: a = b = 1 056.0(1), c = 2 709.6(2) pm. The structure consists of SbCl6- ions and cations [Sb2Cl5(NPMe3)2(CH3CN)]+, in which one SbIII atom and one SbV atom are bridged by the N atoms of the phosphorane iminato ligands.[SbCl(NPPh3)]2[SbCl6]2 · 6 CH3CN: Space group P1, Z = 2, 5 958 observed unique reflections, R = 0.033. Lattice dimensions at -60°C: a = 989.4(11), b = 1 273(1), c = 1 396(1) pm, α = 78.33(7), β = 77.27(8)°, γ = 86.62(8)°. The structure consists of SbCl6- ions and centrosymmetric cations [SbCl(NPPh3)(CH3CN)2]22+, in which the antimony atoms are bridged by the N atoms of the phosphorane iminato ligands.
    Notes: Die Titelverbindungen entstehen durch Reaktion von Antimonpentachlorid in Acetonitrillösungen mit den Phosphaniminatokomplexen SbCl2(NPMe3) bzw. SbCl2(NPPh3), die ihrerseits aus Antimontrichlorid und Me3SiNPR3 (R = Me, Ph) hergestellt werden. Die ionisch aufgebauten Komplexe werden durch ihre 121Sb-Mößbauer-Spektren und durch Kristallstrukturanalysen charakterisiert.[Sb2Cl5(NPMe3)2][SbCl6] · CH3CN: Raumgruppe P41, Z = 4, 3 698 beobachtete unabhängige Reflexe, R = 0,022. Gitterabmessungen bei -60°C: a = b = 1 056,0(1); c = 2 709,6(2) pm. Die Struktur wird aus SbCl6--Ionen und Kationen [Sb2Cl5(NPMe3)2(CH3CN)]+ gebildet, in denen ein SbIII- und ein SbV-Atom über die N-Atome der Phosphaniminatoliganden verknüpft sind.[SbCl(NPPh3)]2[SbCl6]2 · 6 CH3CN: Raumgruppe P1, Z = 2, 5 958 beobachtete unabhängige Reflexe, R = 0,033. Gitterkonstanten bei -60°C: a = 989,4(11); b = 1 273(1); c = 1 396(1) pm; α = 78,33(7)°; β = 77,27(8)°; γ = 86,62(8)°. Die Verbindung besteht aus SbCl6--Ionen und zentrosymmetrischen Kationen [SbCl(NPPh3)(CH3CN)2]22+, in denen die beiden Antimonatome über die N-Atome der Phosphaniminatoliganden verknüpft sind.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946200404
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  • 8
    Electronic Resource
    Electronic Resource
    Phosphaniminato-Trichloroselenate(II): Synthese und Kristallstrukturen von [SeCl(NPPh3)2]+SeCl3- und [Me3SiN(H)PMe3]2+[Se2Cl6]2-Professor Wilhelm Preetz zum 60. Geburtstage gewidmet (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1301-1306 
    Details
    ISSN: 0044-2313
    Keywords: Phosphorane Iminato Complexes of Selenium ; Chloroselenates(II) ; Syntheses ; Crystal Structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Phosphorane Iminato-Trichloroselenates(II): Syntheses and Crystal Structures of [SeCl(NPPh3)2]+SeCl3- and [Me3SiN(H)PMe3]2+[Se2Cl6]2-[SeCl(NPPh3)2]+SeCl3- has been synthesized by the reaction of Se2Cl2 with Me3SiNPPh3 in acetonitrile solution, forming orangered crystals, whereas red crystals of [Me3SiN(H)PMe3]2+[Se2Cl6]2- were obtained by the reaction of Me3SiNPMe3 with SeOCl2 in acetonitrile solution. Both complexes were characterized by X-ray structure determinations.[SeCl(NPPh3)2]+SeCl3-: Space group P21/n, Z = 4, structure solution with 7 489 observed unique reflections, R = 0.057. Lattice dimensions at -60°C: a = 1 117.0; b = 2 241, c = 1 407.5 pm, β = 95.61°. In the cation [SeCl(NPPh3)2]+ the selenium atom is ϕ-tetrahedrally coordinated by the chlorine atom and by the nitrogen atoms of the phosphorane iminato ligands, whereas the anion SeCl3- has a T-shaped structure with ϕ-trigonal-bipyramidale surrounding of the selenium atom.[Me3SiN(H)PMe3]2+[Se2Cl6]2-: Space group P21/c, Z = 4, structure solution with 2 093 observed unique reflections, R = 0.080. Lattice dimensions at -70°C: a = 956, b = 828, c = 1 973 pm, β = 93.80°. The structure consists of [Me3SiN(H)PMe3]+ ions and planar [Se2Cl6]2- anions, in which the selenium atoms are bridged nearly symmetrically by two chlorine atoms.
    Notes: [SeCl(NPPh3)2]+SeCl3- entsteht in Form orangeroter Kristalle bei der Reaktion von Se2Cl2 mit Me3SiNPPh3 in Acetonitrillösung, während [Me3SiN(H)PMe3]2+[Se2Cl6]2- als rote Kristalle durch Einwirkung von Me3SiNPMe3 auf SeOCl2 in Acetonitrillösung gebildet wird. Beide Verbindungen wurden kristallographisch charakterisiert.[SeCl(NPPh3)2]+SeCl3-: Raumgruppe P21/n, Z = 4, Strukturlösung mit 7 489 beobachteten unabhängigen Reflexen, R = 0,057. Gitterabmessungen bei -60°C: a = 1 117,0; b = 2 241; c = 1 407,5 pm, β = 95,61°. In dem Kation [SeCl(NPPh3)2]+ ist das Selenatom ϕ-tetraedrisch von dem Chloratom und von den N-Atomen der beiden Phosphaniminatoliganden umgeben, während das Anion SeCl3- T-förmige Gestalt hat mit ϕ-trigonal-bipyramidaler Umgebung des Selenatoms.[Me3SiN(H)PMe3]2+[Se2Cl6]2-: Raumgruppe P21/c, Z = 4, Strukturlösung mit 2 093 beobachteten unabhängigen Reflexen, R = 0,080. Gitterabmessungen bei -70°C: a = 956; b = 828; c = 1 973 pm, β = 93,80°. Die Struktur besteht aus [Me3SiN(H)PMe3]+-Ionen und planaren Anionen [Se2Cl6]2-, in denen die Selenatome über nahezu symmetrische Chlorobrücken zentrosymmetrisch verknüpft sind.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946200726
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  • 9
    Electronic Resource
    Electronic Resource
    Synthese, Eigenschaften und Kristallstrukturen der Titan(III)-Amido-Komplexe Ti[N(SiMe3)2]3, [TiCl2{N(SiMe3)2}(THF)2] und [Na(12-Krone-4)2][TiCl2{N(SiMe3)2}2] (1996)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 129 (1996), S. 1401-1405 
    Details
    ISSN: 0009-2940
    Keywords: Amido complexes ; Titanium(III) compounds ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Syntheses, Properties, and Crystal Structures of the Titanium(III) Amido Complexes Ti[N(SiMe3)2]3, [TiCl2{N(SiMe3)2}(THF)2], and [Na(12-Crown-4)2][TiCl2{N(SiMe3)2}2]TiCl3(THF)3 reacts with NaN(SiMe3)2 to furnish [TiCl2{N(SiMe3)2}(THF)2] (1), whereas in the presence of 12-crown-4 the ionic amido complex [Na(12-crown-4)2][TiCl2{N(SiMe3)2}2] (5) is obtained besides [Na(12-crown-4)2][TiCl4(THF)] (4). On the other hand, the titanium(III) amido complex Ti[N(SiMe3)2]3 (2), the crystal structure of which was solved, reacts with NaN(SiMe3)2 in the presence of 12-crown-4 with deprotonation of one of the methyl groups to give the carbometalated complex [Na(12-crown-4)2][Ti{N(SiMe3)2}2{N(SiMe 3CH2)}] (3).
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19961291115
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  • 10
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    Electronic Resource
    Synthese und Kristallstrukturen der Wolfram(VI)-Alkin-Komplexe [W2(O)(OMe)6(Et—Se—C≡C—Se—Et)2] und Li[W(OMe)5(Et—Te—C≡C—Te—Et)]Professor Karl-Heinz Thiele zum 65. Geburtstag gewidmet (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 393-399 
    Details
    ISSN: 0044-2313
    Keywords: Alkoxy-Alkyne Complexes of Tungsten ; Synthesis ; Crystal Structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Crystal Structures of the Tungsten(VI)-alkyne Complexes [W2(O)(OMe)6(Et—Se—C≡C—Se—Et)2] and Li[W(OMe)5(Et—Te—C≡C—Te—Et)]The title compounds have been prepared by reactions of lithium methanolate with [WCl4(Et—Se—C≡C—Se—Et)(THF)] and [WCl4(Et—Te—C≡C—Te—Et)(THF)], respectively, in diethylether suspensions. Both complexes were characterized by crystal structure determinations.[W2(O)(OMe)6(Et—Se—C≡C—Se—Et)2]: Space group P1, Z = 2, structure determination with 4 320 observed unique reflections, R = 0.041. Lattice dimensions at -70°C: a = 949.3, b = 1 225.3, c = 1 285.0 pm, α = 82.48°; γ = 82.44°; β = 81.44°. The tungsten atoms are bridged by three μ2-O-atoms of the OMe groups; the alkyne ligands are coordinated side-on in a metallacyclopropene-like fashion.Li[W(OMe)5(Et—Te—C≡C—Te—Et)]: Space group P1, Z = 2, structure determination with 9 381 observed unique reflections, R = 0.038. Lattice dimensions at -70°C: a = 983.4, b = 1606.9, c = 1971.5 pm, α = 66.09°, β = 84.29°, γ = 79.83°. The lithium ions link the [W(OMe)5(Et—Te—C≡C—Te—Et)]- anions to a trimeric ion ensemble via the O atoms of three OMe groups of each anion.
    Notes: Die Titelverbindungen werden durch Reaktion von Lithiummethanolat mit [WCl4(Et—Se—C≡C—Se—Et)(THF)] bzw. mit [WCl4(Et—Te—C≡C—Te—Et)(THF)] in Diethylether hergestellt und durch Kristallstrukturanalysen charakterisiert.[W2(O)(OMe)6(Et—Se—C≡C—Se—Et)2]: Raumgruppe P1, Z = 2, Strukturlösung mit 4 320 beobachteten unabhängigen Reflexen, R = 0,041. Gitterabmessungen bei -70°C: a = 949,3; b = 1225,3; c = 1285,0 pm, α = 82,48°; β = 82,44°; γ = 81,44°. Die beiden Wolframatome sind über drei μ2-OMe-Brücken verknüpft; die Alkinliganden sind seitlich entsprechend von Metallacyclopropengruppen koordiniert.Li[W(OMe)5(Et—Te—C≡C—Te—Et)]: Raumgruppe P1, Z = 2, Strukturlösung mit 9 381 beobachteten unabhängigen Reflexen, R = 0,038. Gitterabmessungen bei -70°C: a = 983,4; b = 1606,9; c = 1971,5 pm, α = 66,09°; β = 84,29°; β = 79,83°. Die Lithiumionen verknüpfen die [W(OMe)5(Et—Te—C≡C—Te—Et)]--Anionen über die O-Atome dreier OMe-Gruppen zu einem trimeren Ionenensemble.
    Additional Material: 2 Ill.
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    URL: http://dx.doi.org/10.1002/zaac.19956210309
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