The N, P, N-type ligands bis (2-picolyl) phenylphosphine (1), bis (4, 5-dihydro-2- oxazolylmethyl) phenylphosphine (2), bis (4, 4-dimethyl-2-oxazolylmethyl) phenylphosphine (3) and bis (2-picolyloxy) phenylphosphine (4) were used to synthesize the corresponding pentacoordinated Ni (II) complexes [Ni {bis (2-picolyl) phenylphosphine} Cl2](6),[Ni {bis (4, 5- dihydro-2-oxazolylmethyl) phenylphosphine} Cl2](7),[Ni {bis (4, 4-dimethyl-2- ...