Temperature-Controlled Syntheses of Substituted 1,2,4-Triazolelead(II) Complexes: Active Lone Pair and N-H•••X (X = Cl, Br, I) Hydrogen Bonds

Three isomorphous lead(II) complexes with a new {N3SX}-coordinated (X = Cl, Br, I) mode have been synthesized and characterized by X-ray diffraction. The structural analyses reveal that the coordination environment around the center metal is distinctly influenced by the stereochemical 6s(2) lone pair and N-H center dot center dot center dot X hydrogen bonds. Additionally, doubly deprotonated trzS(2-) (HtrzSH = 1,2,4-triazole-3-thiol) generated in situ via deamination and dehydrazination of ahtrzS(-) (ahtrzSH = 4-amino3-hydrazino-5-mercapto-1,2,4-triazole) was first observed in a semiconducting three-dimensional coordination network at higher reaction temperature.