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  • Crystal Structures  (5)
  • Aromatizität  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Durch benachbarte B-B-Bindungen stabilisierte Carben-Analoga von Bor: doppelaromatische BishomotriboriranideDiese Arbeit wurde von der Deutschen Forschungsgemeinschaft und vom Fonds der Chemischen Industrie unterstützt. G. S. dankt der Alexander-von-Humboldt-Stiftung für ein Postdoktorandenstipendium.Professor Walter Siebert zum 60. Geburtstag gewidmet (1997)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 109 (1997), S. 1567-1569 
    Details
    ISSN: 0044-8249
    Keywords: Ab-initio-Rechnungen ; Aromatizität ; Bor ; Carbene ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19971091334
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  • 2
    Electronic Resource
    Electronic Resource
    Die Kristallstrukturen von (NH4)2[ReCl6], [ReCl2(CH3CN)4]2[ReCl6] · 2CH3CN und [ReCl4(18-Krone-6)] (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 525-530 
    Details
    ISSN: 0044-2313
    Keywords: Rhenium Complexes ; Syntheses ; IR spectra ; Crystal Structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Crystal Structures of (NH4)2[ReCl6], [ReCl2(CH3CN)4]2[ReCl6] · 2CH3CN and [ReCl4(18)(Crown-6)]Brown single crystals of (NH4)2[ReCl6] are formed by the reaction of NH4Cl with ReCl5 in a suspension of diethylether. [ReCl2(CH3CN)4]2[ReCl6] · 2CH3CN crystallizes as brown crystal plates from a solution of ReCl5 in acetonitrile. Lustrous green single crystals of [ReCl4(18-crown-6)] are obtained by the reaction of 18-crown-6 with ReCl5 in a dichloromethane suspension. All rhenium compounds are characterized by IR spectroscopy and by crystal structure determinations.(NH4)2[ReCl6]: Space group Fm3m, Z = 4, 75 observed unique reflections, R = 0.01. Lattice constant at -70°C: a = 989.0(1) pm. The compound crystallizes in the (NH4)2[PtCl6] type, the Re—Cl distance is 235.5(1) pm.[ReCl2(CH3CN)4]2[ReCl6] · 2CH3CN: Space group P1, Z = 1, 2459 observed unique reflections, R = 0.12. Lattice dimensions at -60°C: a = 859.0(1), b = 974.2(7), c = 1287.3(7) pm, α = 102.69(5)°, b̃ = 105.24(7)°, γ = 102.25(8)°. The structure consists of two symmetry-independent [ReCl2(CH3CN)4]+ ions with trans chlorine atoms, [ReCl6]2- ions, and included acetonitrile molecules. In the cations the Re—Cl bond lengths are 233 pm in average, in the anion they are 235 pm in average.[ReCl4(18-crown-6)]: Space group P21/n, Z = 4, 3 633 observed unique reflections, R = 0.06. Lattice dimensions at -70°C: a = 1040.2(4), b = 1794.7(5), c = 1090.0(5) pm, b̃ = 108.91(4)°. The compound forms a molecular structure, in which the rhenium atom is octahedrally coordinated by the four chlorine atoms and by two oxygen atoms of the crown ether molecule.
    Notes: Braune Einkristalle von (NH4)2[ReCl6] entstehen durch Reaktion von NH4Cl mit ReCl5 in einer Diethylethersuspension. [ReCl2(CH3CN)4]2[ReCl6] · 2CH3CN kristallisiert als braune Kristallplättchen aus einer Lösung von ReCl5 in Acetonitril. Leuchtend grüne Einkristalle von [ReCl4(18-Krone-6)] entstehen durch Reaktion von 18-Krone-6 mit ReCl5 in einer Dichlormethansuspension. Die drei Rhenium-Verbindungen werden durch ihre IR-Spektren und durch Kristallstrukturanalysen charakterisiert.(NH4)2[ReCl6]: Raumgruppe Fm3m, Z = 4, 75 unabhängige beobachtete Reflexe, R = 0,01. Gitterkonstante bei -70°C: a = 989,0(1) pm. Die Verbindung kristallisiert im (NH4)2[PtCl6]-Typ, der Re—Cl-Abstand beträgt 235,5(1) pm.[ReCl2(CH3CN)4]2[ReCl6] · 2CH3CN: Raumgruppe P1, Z = 1, 2459 beobachtete unabhängige Reflexe, R = 0,12. Gitterkonstanten bei -60°C: a = 859,0(1); b = 974,2(7); c = 1287,3(7) pm, α = 102,69(5)°; b̃ = 105,24(7)°; γ = 102,25(8)°. Die Struktur besteht aus zwei symmetrieunabhängigen [ReCl2(CH3CN)4]+-Ionen mit trans-ständigen Chloratomen, [ReCl6]2--Ionen und eingelagerten Acetonitrilmolekülen. In den Kationen betragen die Re—Cl-Abstände im Mittel 233 pm, im Anion im Mittel 235 pm.[ReCl4(18-Krone-6)]: Raumgruppe P21/n, Z = 4, 3 633 beobachtete unabhängige Reflexe, R = 0,06. Gitterkonstanten bei -70°C: a = 1040,2(4); b = 1794,7(5); c = 1090,0(5) pm; b̃ = 108,91(4)°. Die Verbindung bildet eine Molekülstruktur, in der das Rheniumatom oktaedrisch von den vier Chloratomen und von zwei Sauerstoffatomen des Kronenethers koordiniert ist.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19956210404
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  • 3
    Electronic Resource
    Electronic Resource
    Reaktionen von MoNCl3 und WNCl3 mit elementarem Fluor. Kristallstrukturen von [MoO2F2(THF)2] und [WF4(NCl)(CH3CN)] (1996)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 1195-1199 
    Details
    ISSN: 0044-2313
    Keywords: Tetrafluoro-N-chloro-Imido Complexes of Molybdenum and Tungsten ; Donor-Acceptor Complexes ; Crystal Structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions of MoNCl3 and WNCl3 with Elemental Fluorine. Crystal Structures of [MoO2F2(THF)2] and [WF4(NCl)(CH3CN)]The nitrido chlorides MoNCl3 and WNCl3 as well as WCl4(NCl) react with elemental fluorine forming the N-chloro imido complexes MoF4(NCl) and WF4(NCl), which were characterized by IR spectroscopy. With tetrahydrofurane MoF4(NCl) reacts to give [MoF4(NCl)(THF)], which in THF solution slowly converts into [MoO2F2(THF)2]. From WF4(NCl) with acetonitrile the complex [WF4(NCl)(CH3CN)] is obtained. Both donor acceptor complexes were characterized by crystal structure determinations.[MoO2F2(THF)2]: Space group P21/n, Z = 4, structure solution with 1823 unique reflections, R = 0.033 for reflections with I 〉 2σ(I). Lattice dimensions at -40°C: a = 636.2, b = 1119.5, c = 1625.2 pm; β = 93.92(1)º. The compound has a monomeric molecular structure with the fluorine atoms in trans-position to one another and with the oxygen atoms of the THF molecules in trans to the oxo ligands.[WF4(NCl)(CH3CN)]: Space group P21/m, Z = 2, structure solution with 1119 unique reflections, R = 0.038 for reflections with I 〉 2σ(I). Lattice dimensions at 20°C: a = 511.7, b = 714.9, c = 1002.5 pm; β = 102.59(10)º. The compound has a monomeric molecular structure in which the nitrogen atom of the acetonitrile molecule coordinates in trans-position to the N-chloro imido group W≡N—Cl. The structural parameters of this group are WN = 172.2 pm, NCl = 161.1 pm, WNCl = 178.6º.
    Notes: Die Nitridochloride MoNCl3 und WNCl3 reagieren ebenso wie WCl4(NCl) mit elementarem Fluor unter Bildung der N-chlorimido-Komplexe MoF4(NCl) und WF4(NCl), die durch ihre Spektren charakterisiert werden. Mit Tetrahydrofuran reagiert MoF4(NCl) unter Bildung von [MoF4(NCl)(THF)], das sich in THF-Lösung langsam in MoO2F2(THF)2 umwandelt. WF4(NCl) bildet mit Acetonitril den Komplex [WF4(NCl)(CH3CN)]. Von beiden Donor-Akzeptor-Komplexen wurden Kristallstrukturanalysen angefertigt.[MoO2F2(THF)2]: Raumgruppe P21/n, Z = 4, Strukturlösung mit 1823 unabhängigen Reflexen, R = 0,033 für Reflexe mit I 〉 2σ(I). Gitterkonstanten bei -40°C: a = 636,2; b = 1119,5; c = 1625,2 pm; β = 93,92(1)º. Die Verbindung hat eine monomere Molekülstruktur, in der die F-Atome in trans-Position zueinander und die O-Atome der THF-Moleküle in trans-Stellung zu den Oxoliganden angeordnet sind.[WF4(NCl)(CH3CN)]: Raumgruppe P21/m, Z = 2, Strukturlösung mit 1119 unabhängigen Reflexen, R = 0,038 für Reflexe mit I 〉 2σ(I). Gitterkonstanten bei 20°C: a = 511,7; b = 714,9; c = 1002,5 pm; β = 102,59(10)º. Die Verbindung hat eine monomere Molekülstruktur, in der das N-Atom des Acetonitrilmoleküls in trans-Stellung zur N-chlorimido-Gruppe W≡N—Cl angeordnet ist. Die Strukturparameter dieser Gruppe sind WN = 172,2 pm, NCl = 161,1 pm, WNCl 178,6º.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19966220715
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  • 4
    Electronic Resource
    Electronic Resource
    Funktionalisierte Alkinkomplexe von Wolfram(VI). Synthese und Kristallstrukturen von [WCl4(Et—Se—C≡C—Se—Et)(THF)] und [WCl4(Et—Te—C≡C—Te—Et)(THF)]Professor Gerhard Fritz zum 75. Geburtstag gewidmet (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 388-392 
    Details
    ISSN: 0044-2313
    Keywords: Functionalized Alkyne Complexes of Tungsten ; Synthesis ; IR spectra ; Crystal Structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Functionalized Alkyne Complexes of Tungsten(VI). Syntheses and Crystal Structures of [WCl4(Et—Se—C≡C—Se—Et)(THF)] and [WCl4(Et—Te—C≡C—Te—Et)(THF)]The title compounds have been prepared by reactions of [WCl4(SEt2)2] with the alkynes Et—X—C≡C—X—Et (X = Se, Te) in CCl4 solution and subsequent addition of tetrahydrofurane. Both complexes were characterized by crystal structure determinations.[WCl4(Et—Se—C≡C—Se—Et)(THF)]: Space group P21/n, Z = 4, structure determination with 2942 unique reflections, R = 0.038. Lattice dimensions at 20°C: a = 934.2, b = 1639.5, c = 1189.5 pm, β = 96.497°.[WCl4(Et—Te—C≡C—Te—Et)(THF)]: Space group P21/n, Z = 4, structure determination with 4097 unique reflections, R = 0.067, Lattice dimensions at -70°C: a = 899.2, b = 1691.9, c = 1213.3 pm, β = 96.82°.The complexes have monomeric molecular structures with the oxygen atom of the THF molecules in trans-position to the side-on bound alkyne ligands.
    Notes: Die Titelverbindungen werden aus [WCl4(SEt2)2] und den Alkinen Et—X—C≡C—X—Et (X = Se, Te) in CCl4-Lösung nach Zusatz von Tetrahydrofuran erhalten und durch Kristallstrukturanalysen charakterisiert.[WCl4(Et—Se—C≡C—Se—Et)(THF)]: Raumgruppe P21/n, Z = 4, Strukturverfeinerung mit 2942 unabhängigen Reflexen, R = 0,038. Gitterabmessungen bei 20°C: a = 934,2; b = 1639,5; c = 1189,5 pm, β = 96,497°.[WCl4(Et—Te—C≡C—Te—Et)(THF)]: Raumgruppe P21/n, Z = 4, Strukturverfeinerung mit 4097 unabhängigen Reflexen, R = 0,067. Gitterabmessungen bei -70°C: a = 899,2; b = 1691,9; c = 1213,3 pm, β = 96,82°.Beide Verbindungen haben monomere Molekülstrukturen, in denen sich das O-Atom des THF-Moleküls in trans-Position zum seitlich gebundenen Alkinliganden befindet.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19956210308
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  • 5
    Electronic Resource
    Electronic Resource
    Reduktion von Dicarbapentaboranen(5) zu 1,2-Diborata-4-boracyclopentadienen: antiaromatische Verbindungen mit 4π-ElektronensystemProfessor Gerhard E. Herberich zum 60. Geburtstag gewidmetDiese Arbeit wurde von der Deutschen Forschungsgemeinschaft und vom Fonds der Chemischen Industrie gefördert. (1997)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 109 (1997), S. 879-882 
    Details
    ISSN: 0044-8249
    Keywords: Ab-initio-Rechnungen ; Aromatizität ; Bor ; Carborane ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19971090814
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  • 6
    Electronic Resource
    Electronic Resource
    Synthese und Kristallstrukturen der silylierten Tris-Phosphanimine R—C(CH2PPh2NSiMe3)3 mit R = H und CH3Professor Rudolf Hoppe zum 75. Geburtstag gewidmet (1997)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 1739-1743 
    Details
    ISSN: 0044-2313
    Keywords: Silylated λ5-Phosphazenes ; Synthesis ; NMR spectra ; 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 Silylated λ5-Phosphazenes R—C(CH2PPh2NSiMe3)3 with R = H and CH3The title compounds are obtained by Staudinger reaction from the corresponding tripodal phosphanes R—C(CH2PPh2)3 and trimethylsilylazide. Both complexes are characterized by their IR and NMR spectra and by crystal structure analyses.H—C(CH2PPh2NSiMe3)3 (1): Space group P21/c, Z = 4, structure determination with 7833 independent reflections, R = 0.055. Lattice dimensions at -50°C: a = 1399.5, b = 2311.4, c = 1678.9 pm, β = 112.92°.CH3—C(CH2PPh2NSiMe3)3 (2): Space group P1, Z = 2, structure determination with 9251 independent reflections, R = 0.057. Lattice dimensions at -50°C: a = 1276.5, b = 1386.9, c = 1790.2 pm; α = 85.55°, β = 69.39°, γ = 62.99°.1 and 2 form monomeric molecules which are distinguished by their conformation.
    Notes: Die Titelverbindungen werden durch Staudinger-Reaktion aus den entsprechenden tripodalen Phosphanen R—C(CH2PPh2)3 und Trimethylsilylazid hergestellt und durch ihre IR- und NMR-Spektren sowie durch Kristallstrukturanalysen charakterisiert.H—C(CH2PPh2NSiMe3)3 (1): Raumgruppe P21/c, Z = 4, Strukturbestimmung mit 7833 unabhängigen Reflexen, R = 0,055. Gitterkonstanten bei -50°C: a = 1399,5; b = 2311,4; c = 1678,9 pm; β = 112,92°.CH3—C(CH2PPh2NSiMe3)3 (2): Raumgruppe P1, Z = 2, Strukturbestimmung mit 9251 unabhängigen Reflexen, R = 0,057. Gitterkonstanten bei -50°C: a = 1276,5; b = 1386,9; c = 1790,2 pm; α = 85,55°; β = 69,39°; γ = 62,99°.1 und 2 bilden monomere Moleküle, die sich durch ihre Konformation unterscheiden.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19976231112
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  • 7
    Electronic Resource
    Electronic Resource
    Manganorganische Phosphaniminato-Komplexe mit HeterocubanstrukturProfessor Rainer Mattes zum 60. Geburtstag gewidmet (1997)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 351-356 
    Details
    ISSN: 0044-2313
    Keywords: Organomanganese Compounds ; Phosphoraneiminato Complexes ; Syntheses ; Crystal Structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Organomanganese Phosphoraneiminato Complexes with Heterocubane StructureThe organomanganese phosphoraneiminato complexes [MnR(NPEt3)]4 (R = Me, C=C—Ph, C=C—Tol, C=C—CMe3, C=C—SiMe3) with heterocubane structures have been prepared by reaction of the bromo derivative [MnBr(NPEt3)]4 with the corresponding lithium reagents LiR in THF/hexane solution, forming shiny red, very reactive compounds which are well soluble in hydrocarbons. They were characterized by mass spectroscopy, IR spectroscopy and by crystal structure determinations. According to these the compounds form nearly perfect Mn4N4 heterocubane frameworks with m̈3-N bridges of the phosphoraneiminato groups with Mn—N bond lengths of 214.5 pm in average which leads to Mn … Mn contacts of 299.5 pm in average. The organic residues R are terminal bonded with Mn—C distances Mn—Me of 219.5 pm and Mn—C=C—R of 207.6 pm in average.
    Notes: Die organisch substituierten Phosphanimi nato-Komplexe des Mangan(II) mit Heterocubanstruktur [MnR(NPEt3)]4 (R = Me, C=C—Ph, C=C—Tol, C=C—CMe3, C=C—SiMe3) werden durch Reaktion des Bromoderivates [MnBr(NPEt3)]4 mit den entsprechenden Lithium-Reagentien LiR in THF/Hexan als leuchtend rote, sehr reaktive, in Kohlenwasserstoffen leicht lösliche Verbindungen erhalten. Sie werden durch die Massen- und IR-Spektren sowie durch Kristallstrukturanalysen charakterisiert. Danach werden je vier Manganatome über je vier m̈3-N-Atome der Phosphan-iminato-Gruppen zu nur wenig verzerrten m̈3-N4-Kuben mit Mn—N-Abständen von im Mittel 214,5 pm verbrückt, was zu Mn … Mn-Kontakten von 299,5 pm führt. Die Reste R sind terminal gebunden mit Mn—C-Abständen Mn—Me von 219,5 pm und Mn—C=C—R von im Mittel 207,6 pm.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19976230156
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