Titan-stickstoff-verbindungen
| Autor: | K. Wiegel, D.J. Brauer, H. Bürger |
|---|---|
| Rok vydání: | 1978 |
| Předmět: |
Chemistry
Organic Chemistry Cyclohexane conformation Ionic bonding Crystal structure Triclinic crystal system Biochemistry Inorganic Chemistry symbols.namesake Crystallography Molecular geometry Materials Chemistry symbols Proton NMR Physical and Theoretical Chemistry Raman spectroscopy Single crystal |
| Zdroj: | Journal of Organometallic Chemistry. 150:215-231 |
| ISSN: | 0022-328X |
| DOI: | 10.1016/s0022-328x(00)84724-5 |
| Popis: | Novel cyclotrisilazane complexes X2Ti[N(SiMe2NMe)2SiMe2]2, X = Cl, Br and C6H5CH2 (VI), and chelate amido compounds (C6H5CH2)2Ti(NMeSiMe2)2 Y, Y = −, NMe and CH2, have been prepared and were characterized by 1H NMR and, in part, infrared and Raman spectroscopy. Pyrolysis of the bis(benzyl) derivatives apparently proceeds by an ionic mechanism, VI being remarkably stable with decomposition above 140°C. The crystal structure of VI was determined by single crystal X-ray methods. The compound forms triclinic crystals with a 14.629(3), b 17.461(4), c 17.593(2) A, α 88.447(8), β 80.673(8), γ 70.92(2)°, Z 4, P 1, D o 1.14 and D c 1.147 g cm −3 . Large block least-squares refinement, only the Ti and Si atoms are anisotropic, converged with an R index of 0.108 for 4820 counter measured reflections with I ⩾ 2σ(I). The Ti atoms possess distorted tetrahedral coordination with bond distances TiN 1.92(2) A, and TiC 2.09(3) A, and bond angles NTiN 120(1)° and CTiC 99(1)°. The large TiCC valency angles (117(1)–129(1)°) are indicative of the σ nature of the TiC(benzyl) bond. The cyclotrisilazane ligands have a boat conformation. |
| Databáze: | OpenAIRE |
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