PHOSPHANYL-AMINO COMPLEXES OF NICKEL(II) - SYNTHESIS AND STRUCTURE

New neutral pentacoordinate nickel(II) complexes of the type [NiCl2(PR 3)((PN)-N-boolean AND)] [PR3 = PMe3, PMe2Ph, PMePh2; (PN)-N-boolean AN D = 2-(diphenylphosphanyl)aniline ((PNH2)-N-boolean AND), N-methyl-2-( diphenylphosphanyl)aniline ((PNHMe)-N-boolean AND), N,N-dimethyl-2-(di phenylphosphanyl)aniline ((PNMe2)-N-boolean AND)], as well as cationic tetracoordinate nickel(II) complexes of the type [NiCl(PR3)((PN)-N-bo olean AND)](+) have been synthesized and characterized both in the sol id state and in solution. Interesting X-ray structural data have been collected for each class of compounds, which show, inter alia, that th e pentacoordinate neutral complexes can be isolated in two different m olecular forms, namely square-pyramidal or bipyramidal-trigonal.