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

Abstract

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.