IRIDIUM AND RHODIUM NITROSYL COMPLEXES WITH METHYLATED 1,10-PHENANTHROLINE AND 2,2'-BIPYRIDINE LIGANDS

Dicationic nitrosyl complexes of rhodium and iridium with methyl-substituted 1,10-phenanthroline and 2,2′-bipyridine have been synthesized and characterized. The general formula for these complexes is of the type [M(NO)(N--N)(PPh3)2]* where M = Rh and Ir, and (N-N) is the nitrogen chelating ligand. The 1H and31P n.m.r. spectra of these complexes have been studied in order to establish the geometric conformation of these pentacoordinate nitrosyl complexes. On the basis of i.r and1 H and31 P n.m.r. data a formal octahedral geometry, with linear apical nitrosyl group, equatorial phosphines and chelating ligands and coordinated water, is proposed. Trigonal bipyramid and square pyramid geometries are discussed. © 1979 Verlag Chemie, GmbH.