Peculiarities of coordination of silaoxaphenanthrene with the tricarbonylchromium group. Cyrstal and molecular structure of tricarbonyl[1-4 a(10 a)-η-10,10- dimethyl-10-sila-9-oxa-9,10-dihydrophenanthrene]chromium and tricarbonyl[5-8 a(4 b)-η-10,10-dimethyl-10-sila-9-oxa-9,10- dihydrophenanthrene]chromium

• Published in: Journal of organometallic chemistry Vol. 306; no. 1; pp. 55 - 62
• Main Authors: Kirillova, N.I., Gusev, A.I., Sharapov, V.A., Afanasova, O.B., Zubarev, Yu.E., Alekseev, N.V., Chernyshev, E.A., Struchtov, Yu.T.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 20.05.1986
• ISSN: 0022-328X; 1872-8561
• DOI: 10.1016/S0022-328X(00)98933-2

An X-ray crystal structural analysis of two tricarbonylchromium complexes formed by 10,10-dimethyl-10-sila-9-oxa-9,10-dihydrophenanthrene (I) and having the same composition [ C 6H 4(SiMe 2O)C 6 H 4]Cr(CO) 3 (II and III) was carried out. The complexes are isomers in which wherein different aromatic fragments of the ligand are coordinated with the Cr atom. The silicon-subsituted fragment is linked with the metal atom in complex II, the oxygen-substituted fragment is coordinated in complex III. In both cases the tricyclic system of the ligand is nonplanar with the dihedral angle between benzene rings being 20.4° in II and 15.5° in III. The chromium atom is displaced from the centre of the coordinated ring in the direction opposite to the ring junction carbon atoms by 0.032 Å in II and 0.064 Å in III. The final R-factors are 0.029 and 0.027 for structures II and III, respectively.