Synthesis, Crystal Structure, and Characterization of Two New Zinc(II) Complexes With (4-Amino-1,2,4-triazole- 3,5-diyldithio)diacetic Acid and N-Containing Ligands

Abstract

Two new complexes, [Zn(phen)(H₂O)₄]·(atda)·(H₂O)₅ (1) and [Zn(4,4′-bipy)₂(H₂O)₄]·(atda) (2) (H₂atda = (4-amino-1,2,4-triazole-3,5-diyldithio)diacetic acid, phen = 1,10-phenanthroline, 4,4′-bipy = 4,4′-bipyridine), have been synthesized and characterized. X-ray analyses revealed that in two complexes, the atda²⁻ ligands act only as counteranions and three-dimensional (3D) supramolecular architectures are constructed via series of hydrogen-bonding interactions. Though the Zn(II) centers are both coordinated by four water molecules and two N atoms, the different arrangement style of coordinated water molecules in two complexes and the occurrence of lattice water molecules in complex 1 lead to different 3D structures. The IR and thermal analyses further confirmed the structural results.

Keywords:

• crystal structure
• flexible carboxylate ligand
• supramolecular compounds
• Zn(II) complexes

Acknowledgments

This work was supported by the National Natural Science Foundation of China (Nos. 20871106 and 91010008) and the China Postdoctoral Science Foundation (No. 20080441028).