Organometallic nickel(II) complexes with substituted benzonitrile ligands. Synthesis, electrochemical studies and non-linear optical properties. The X-ray crystal structure of [Ni(¿5-C5H5)P(C6H5)3(NCC6H4NH2)][PF6] - Dias, Alberto R.; Garcia, M.Helena; Mendes, Paulo; Piedade, M.Fátima M.; Duarte, M.Teresa; Calhorda, Maria J.; Mealli, Carlo; Wenseleers, W.; Gerbrandij, A.W.; Goovaerts, Etienne (1998)