Two photoluminescent pentanuclear homo- and hetero-metal complexes based on benzotriazole bridge

Abstract

Two new discrete Btz-bridged pentanuclear metal complexes, [HDMF][NaHg₄(Btz)₆I₄] (1) and [Zn₅(Btz)₆(L)₃(Ac)] · 0.5MeOH · 0.5H₂O (2) (Btz = deprotonated benzotriazole, L = p-aminobenzoate, HDMF = protonated DMF, and Ac = acetate), were synthesized using three-layered diffusion and natural evaporation methods, respectively. In 1, the pentanuclear anion [NaHg₄(Btz)₆I₄]⁻ is composed of a tetrahedral arrangement of four four-coordinate Hg(II) ions centered on the six-coordinate Na(I), and thereby forming a rare Btz-bridged hetero-metal complex. Compound 2 is a neutral pentanuclear homo-metal complex, consisting of a tetrahedral arrangement of four five-coordinate Zn(II) ions centered on the fifth six-coordinate Zn(II). The thermal stabilities and solid-state photoluminescence of the two complexes have been investigated.

Keywords:

• Pentanuclear metal complex
• Benzotriazole
• Crystal structure
• Fluorescence
• Thermal properties

Acknowledgments

We gratefully acknowledge financial support from the National Natural Science Foundation of China (no. 20771094) and the Science and Technology Key Task of Henan Province (no. 0524270061).