Twelve new cobalt (III) complexes of the types, cisα-[Co (L)(rac (P)-323 or 333NPPN) p+ (L= 2, 4-pentanedionate (acac) and oxalate (ox) ions)(four complexes) and cisβ-[Co (L)(rac (P)- or meso (P)-323 or 333NPPN) p+ (eight complexes) were prepared and characterized by 1 H NMR and absorption spectra, where rac (P)-and meso (P)-323NPPN denote rac (P)-and meso (P)-NH 2 (CH 2) m P (C 6 H 5)(CH 2) m P (C 6 H 5)(CH 2) m NH 2 with m= 3 and n= ...