Synthesis, characterization, and crystal structure of a tricadmium complex of 3,4-diamino-5-methyl-1,2,4-triazole

The ligand 3,4-diamino-5-methyl-4H-1,2,4-triazole (DAMT) and its trinuclear cadmium complex [Cd₃(DAMT)₂(DAMTH)₂cl₈] have been prepared and identified by elemental analyses, infrared, Raman, ¹H and ¹³C NMR spectroscopy, and a single crystal X-ray diffraction. The protonation equilibria of the ligand have been studied by pH-potentiometry, with pK₁ 13.29 and pK₂ 5.40 determined. The free ligand consists of triazole cations (DAMTH) and chloride counter ions. The neutral cadmium compound is a complex of the cationic ligand in which 3Cd's are coordinated by two unidentate cation forms of the ligands (DAMTH), two ambidentate neutral forms of the ligand (DAMT), and eight chlorides. Cadmium ions have slightly distorted octahedral geometry