Synthesis and properties of a POM-based trinuclear copper(ii) triazole framework.

A novel POM-based trinuclear copper(ii) triazole framework, namely, [H 2 {Cu 6 (trz) 6 (μ 3 -OH) 2 }Mo 5 O 18 ]·3H 2 O (1) was isolated using a hydrothermal method, which displays a 3D network constructed from trinuclear copper(ii) units and triazole ligands with [Mo 5 O 18 ] 6- anions as templates. 1 has been identified by single crystal X-ray diffraction, elemental analysis, thermogravimetric analysis, powder X-ray diffraction and FT-IR. Magnetic studies indicate that antiferromagnetic interactions exist in 1. In addition, 1 exhibits good Lewis acid catalytic activity for the synthesis of cyclohexanone ethylene ketal with 95% conversion. The HOMO-LUMO gap ( E g ) of 1 is 2.34 eV calculated using the Kubelka-Munk equation ( Fhν ) 0.5 , indicating that its forbidden bandwidth belongs to the semiconductor category. Visible-light photodegradation of RhB catalyzed by 1 was investigated, which shows high activity with an above 98% degradation rate.