Metal complexes of sulfur-nitrogen chelating agents. IV. Complexes of Ni(II), Pd(II), Pt(II), and Rh(III) with methyl ester of 2-Amino-1-cyclopentene-1-carbodithioic acid

Abstract

The methyl ester of 2-amino-1-cyclopentene-1-carbodithioic acid (HE) acts both as an unidentate and a bidentate ligand. With Ni(II) and Pd(II) the deprotonated chelates of the ME₂ type are obtained readily, the corresponding Pt(II) complex being obtained on the addition of an equivalent amount of alkali. In these compounds, bond formation takes place from the nitrogen and the sulfur atoms and there is strong delocalization in the chelate ring. Unidentate bonding behavior of the ligand is observed in the complexes Pt(HE)₂Cl₂ and Rh(HE)₃Cl₃, where the bonding takes place through the nitrogen atom only.