Amidinatokomplexe von Bor, Aluminium, Gallium, Indium und Zinn Die Kristallstrukturen von Ph-C(NSiMe3)2AICI2 und Ph-C(NSiMe3)2SnCl3

Christ ina Ergez inger , Frank Weller und Kurt Dehnicke* Fachbereich Chemie der Universität Marburg, Hans-Meerwein-Straße, D-3550 Marburg/Lahn Z. Naturforsch. 43b, 1621-1627 (1988); eingegangen am 18. August 1988 N,N'Bis-(trimethylsilyl)amidinato Complexes, Synthesis, IR Spectra. Crystal Structure The trichlorides of aluminium, gallium, and indium, as well as boron tribromide and tin tetrachloride react with N,N,N'-tris(trimethylsilyl)benzamidine to form the monomeric N.N'-bis(trimethylsilyl)benzamidinato complexes Ph-C(NSiMe,)2MX2 (M = B, Al. Ga, In; X = Cl, Br) and Ph —C(NSiMe3)2SnCl3, respectively. All compounds have been characterized by their IR spectra, two of them by X-ray diffraction studies. Ph — C(NSiMei)2AlCl2: Space group C2/c, Z = 4, 1152 independent observed reflexions, R = 0.052. Lattice dimensions (19 °C): a = 1558.6(1), b = 1116.6(1), c = 1307.0(1) pm, ß = 115.17(1)°. The compound forms monomeric molecules, in which the aluminium atom is tetrahedrally coordinated by two chlorine atoms and by the two nitrogen atoms of the benzamidinato chelate. Bond length A1N = 188.2 pm. Ph — C(NSiMe^)2SnCU: Space group P I , Z = 2, 3293 independent observed reflexions, R = 0.034. Lattice dimensions (19 °C): a = 980.1(1), b = 1025.9(1), c = 1230.5(2) pm. a = 68.40(1)°, ß = 87.71(1)°, y — 68.92(1)°. The compound forms monomeric molecules, in which the tin atom is five-coordinated by three chlorine atoms and by the two nitrogen atoms of the benzamidinato chelate. Bond lengths SnN = 213.5 and 215.2 pm.