Structural diversity in trinuclear nickel(II) complexes of 3,5-diamino-1,2,4-triazole.

Zhang, Guo-Fang; Gao, Ling; Li, Ping; Zhao, Feng-Qi; Fan, Xue-Zhong; Chen, Ning; Xiang, Xiao-Ping; Gao, Han-Chen; Wang, Jie

Two trinuclear 3,5-diamio-1,2,4-triazole(Hdatz)-derived nickel(II) compounds, [Ni3(Hdatz)6(H2O)6]Br6 · 4H2O (1) and [Ni3(Hdatz)6(datz)2(H2O)4]Cl4 · 6H2O (2), are reported. Structural analyses reveal that in 1 the six Hdatz ligands are bidentate N1, N2-bridging coordination. However, the X-ray diffraction analysis shows that in 2 there are eight triazole ligands, six of which are neutral and two deprotonated. Four neutral triazoles are N1, N2-bridging and two monodentate; the deprotonated triazoles (datz) are bidentate N1, N2-bridging. The coexistence of both neutral and anionic triazole ligands as well as different coordination modes in one compound is relatively rare. The difference in coordination modes is believed to be anion-controlled. Both compounds are additionally characterized by elemental analysis, IR, and UV-Vis spectroscopy.

MICROSTRUCTURE; NICKEL compounds; AMINO group; TRIAZOLES; COORDINATION compounds; X-ray diffraction

Journal of Coordination Chemistry, 2011, Vol 64, Issue 20, p3551

0095-8972

Academic Journal

10.1080/00958972.2011.626406