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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 953-958 
    ISSN: 0044-2313
    Keywords: Phosphorane Iminato Complexes of Titanium, Synthesis, Crystal Structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Phosphorane Iminato Complexes of Titanium. The Crystal Structures of [TiCl2(NPPh3)2] and [TiCl3(NPMe2Ph)(CH3CN)]2[TiCl2(NPPh3)2] has been prepared by the reaction of [TiCl3(NPPh3)] with excess Me3SiNPPh3 in a melt at 220°C, forming colourless crystals. [TiCl3(NPMe2Ph)(CH3CN)]2 is formed as yellow, moisture sensitive crystals from acetontrile solutions of [TiCl3(NPMe2Ph)]2, which on its part has been obtained by the reaction of TiCl4 with Me3SiNPMe2Ph. The complexes are characterized by IR spectroscopy and by crystal structure determinations.[TiCl2(NPPh3)2]. Space group Fdd2, Z = 8, structure refinement with 2875 observed unique reflections, R = 0.039. Lattice dimensions at 19°C: a = 2080.9, b = 3308.5, c = 973.6 pm. The compound forms monomeric molecules with bond lengths TiN of 179.0 pm and PN of 156.8 pm, which correspond with double bonds. The bond angle TiNP is 166.6°.[TiCl3(NPMe2Ph)(CH3CN)]2. Space group P1, Z = 1, structure refinement with 2577 unique reflections, R = 0.039 for reflections with I 〉 2σ(I). Lattice dimensions at 20°C: a = 856.6, b = 923.1, c = 1008.3 pm, α = 81.23°, β = 71.63°, γ = 81.41°. The compound forms centrosymmetric, dimeric molecules, in which the titanium atoms are linked via chloro bridges TiCl2Ti with TiCl bond lengths of 243.9 and 270.3 pm. In trans-position to the longer TiCl bonds the nitrogen atoms of the phosphorane iminato groups are coordinated with bond lengths TiN of 173.9 pm and PN of 161.4 pm which again correspond with double bonds. The bond angle TiNP is 156.4°.
    Notes: [TiCl2(NPPh3)2] wird in Form farbloser Kristalle durch Schmelzreaktion von [TiCl3(NPPh3)] mit überschüssigem Me3SiNPPh3 bei 220°C erhalten. [TiCl3(NPMe2Ph) · (CH3CN)]2 bildet gelbe, feuchtigkeitsempfindliche Kristalle, die aus Acetonitrillösung von [TiCl3(NPMe2Ph)]2 erhalten werden, welches seinerseits aus TiCl4 und Me3SiNPMe2Ph entsteht. Die Komplexe werden durch ihre IR-Spektren und durch Kristallstrukturanalysen charakterisiert.[TiCl2(NPPh3)2]. Raumgruppe Fdd2, Z = 8, Strukturverfeinerung mit 2875 beobachteten unabhängigen Reflexen, R = 0,039. Gitterabmessungen bei 19°C: a = 2080,9; b = 3308,5; c = 973,6 pm. Die Verbindung bildet monomere Moleküle mit Abständen TiN von 179,0 pm und PN von 156,8 pm, die Doppelbindungen entsprechen, und einem TiNP-Bindungswinkel von 166,6°.[TiCl3(NPMe2Ph)(CH3CN)]2. Raumgruppe P1, Z = 1, Strukturverfeinerung mit 2577 unabhängigen Reflexen, R = 0,039 für Reflexe mit I 〉 2σ(I). Gitterabmessungen bei 20°C: a = 856,6; b = 923,1; c = 1008,3 pm, α = 81,23°; β = 71,63°; γ = 81,41°. Die Verbindung bildet zentrosymmetrische, dimere Moleküle, in denen die Titanatome über TiCl2Ti-Brücken mit TiCl-Abständen von 243,9 und 270,3 pm verknüpft sind. In den trans-Positionen zu den langen Bindungen befinden sich die N-Atome der Phosphaniminatogruppen mit Abständen TiN von 173,9 pm und PN von 161,4 pm, die wiederum Doppelbindungen entsprechen. Der TiNP-Bindungswinkel beträgt 156,4°.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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