PREPARATION AND CHARACTERIZATION OF COBALT(III) COMPLEXES CONTAINING 4,7-DIPHENYL-4,7-DIPHOSPHADECANE-1,10-DIAMINE AND 4,8-DIPHENYL-4,8-DIPHOSPHAUNDECANE-1,11-DIAMINE, NH2NCH2)3P(C6H5)-(CH2)NP(C6H5)(CH2)3NH2 (N=2,3)

Twelve new cobalt(III) complexes of the types, cis-alpha-[Co(L)(rac(P)-323 or 333NPPN)]p+ (L = 2,4-pentanedionate (acac) and oxalate (ox) ions) (four complexes) and cis-beta-[Co(L)(rac(P)- or meso(P)-323 or 333NPPN)]p+ (eight complexes) were prepared and characterized by H-1 NMR and absorption spectra, where rac(P)- and meso(P)-323NPPN denote rac(P)- and meso(P)-NH2(CH2)mP(C6H5)(CH2)mNH2 with m = 3 and n = 2, and 333NPPN the ligand with m = 3 and n = 3. Reactivities of the complexes towards hydrochloric acid were examined and compared with those of the corresponding 222NPPN (m = 2, n = 2) and 232NPPN (m = 2, n = 3) complexes. All the cis-alpha isomers yield the cis-alpha-dichloro complexes, the 333NPPN and 222NPPN complexes being more reactive than the 232NPPN and 323NPPN complexes in which five- and six-membered chelate rings of NPPN are involved. For the cis-beta isomers, the acac complexes afford [Co(acac)(Cl)(mnmNPPNH+)]2+ except the rac(P)- and meso(P)-333NPPN complexes which give the trans-dichloro complexes, while all the ox complexes liberate the ox ion to yield the dichloro complex of the cis-alpha, cis-beta, or trans configuration. For both cis-beta-acac and -ox isomers, the 222NPPN and 232NPPN complexes are more reactive than those of 323NPPN and 333NPPN, and the meso(P)-complexes are more reactive than the rac(P)-complexes.