The synthesis and characterization of Cd2+, Ag+, and Hg2+ complexes with deprotonated tolbutamide and chlorpropanude hgands is described. The crystal and molecular structures of Hg(CH3C6H4SO2NCONH-n-Bu)2 (I) and K[Cd(ClC6H4SO2NCONH-n-Pr)3] (III) are reported. In I the coordination environment around the Hg2+ atom is strictly linear and the sulfonylurea ligand is bound in a predominantly monodentate fashion. The tolbutamide ligand is bound through the deprotonated sulfamido nitrogen atom. The Hg-N distance is 2.052 (17) Å. By comparison the chlorpropamide ligand is coordinated to a Cd2+ atom in a bidentate mode with both the sulfamido nitrogen and the carbonyl oxygen atoms bound to the metal center. The coordination environment around the Cd2+ atom can be best described as trigonal prismatic. The mean Cd-N and Cd-O distances are 2.212 (20) and 2.535 (24) Å, respectively. The counterion K+ slightly interacts with the oxygen of the carbonyl and sulfonyl groups in the anion in such a way as to form a polymeric zigzag K⋯Cd chain parallel to the a axis. The IR spectra show (C..-O) and (C..-N) stretching frequencies characteristic for either mode of sulfonylurea ligand coordination. On the basis of the IR spectra we propose a structure for K[Ag(p-XC6H4SO2NCONHR)2] (tolbutamide, X = CH3 and R = n-Bu; chlorpropamide, X = Cl and R = n-Pr) similar to that of the Hg2+ complexes. The 1H NMR spectra of these compounds are also reported.
|Number of pages||8|
|Publication status||Published - 1987|
ASJC Scopus subject areas
- Inorganic Chemistry