Synthesis and Characterization of Mixed Ligands Cadmium (II) Complexes with N-Hydroxymethylsaccharinate and diphosphines

Reaction of cadimium(II) chloride CdCl2.6H2O with two equivalents of N-hydroxymethylsaccharin (Sac-CH2OH) (1) in the presence of NEt3 afforded the presumably tetrahedral complex [Cd(K2-Sac-CH2O)2] (2). The Sac-CH2O- ligand behaves as a bidentate chelate. Reaction of (2) with one equivalent of the bidentate ligands (dipos); Ph2P(CH2)nPPh2, (n = 1 dppm; 2 dppe; 3 dppp; 4 dppb), Ph2P(S)(CH2)P(S)Ph2 (dppmS2) afforded tetrahedral complexes of the type [Cd(K1-Sac-CH2O)2(diphos)] (3-7). The reaction with two equivalents of the monodentate ligands (phos); Ph3P or Ph3PS gave [Cd(K1-Sac-CH2O)2(phos)2] (8,9). The N-hydroxymethylsaccharinate anion acts as a monodentate ligand to the cadmium center through the hydroxymethyl oxygen atom. The complexes were characterized by physico-chemical and spectroscopic methods.