AZULENE AS A LIGAND IN CATIONIC RHODIUM AND IRIDIUM COMPLEXES. CRYSTAL STRUCTURE OF PF6

Article abstract of DOI:10.1016/0022-328X(84)80605-1

Rhodium or iridium complexes of formula ⁺ have been prepared by treating 2 complexes with silver salts and azulene, and also by treating ⁺ with azulene.The reactions of some representative complexes have been studied.Reaction of ²⁺ with azulene appears to give dinuclear diazulene cationic complexes.The crystal structure of compound PF6 has been solved by X-ray methods.It crystallizes in the space group P2₁/c with cell constants 8.4241(4), 16.6911(8), 15.0026(7) Angstroem, 95.897(6) deg.Refinement gave R=0.027 and R_w=0.032 for 2991 observed reflexions.The Rh atom is coordinated to the five-membered ring, with Rh-C distances shortest for the atoms which are trans to the diolefinic double bonds.The bonding scheme within the azulene ligand differs from that in the parent hydrocarbon.