Hydrothermal Assembly and Photocatalytic Characterization of Polyoxometalate-Based CuII and CuI Hybrid Coordination Framework with 4-Amino-1,2,4-triazole

Under hydrothermal conditions, two novel polyoxometalate (POM)-based Cu-II and Cu-I hybrid materials, namely [Cu-2(4-NH2-trz)(4)(Mo8O26)(H2O)(4)]center dot 5H(2)O (1) and [Cu-4(4-NH2-trz)(4)Mo8O26] (2) (4-NH2-trz=4-amino-1,2,4-triazole) have been designed and synthesized. Their crystal structures have been determined by single crystal X-ray diffraction, FT-IR infrared spectra and powder X-ray diffraction analysis. In 1, bi-dentate 4-NH2-trz ligands bridge two neighboring Cu-II centers forming dinuclear structural units, which are further linked by Mo8O264- ions and arranged into a one-dimensional (1D) hybrid coordination framework. In 2, bidentate 4-NH2-trz ligands also link neighboring Cu-I centers to generate unique 1D [Cu-4(4-NH2-trz)(4)](n) helical chains. Further these infinite right-hand and left-hand helical chains are linked by (beta-Mo8O26)(4-) anions to form a 2D hybrid framework. Photocatalytic activities for decomposition of different organic dyes (methylene blue (MB), rhodamine B (RhB) and methyl orange (MO)) have been investigated for 1 and 2, indicating that 1 and 2 are good candidates for the photocatalytic degradation of these organic dyes. CCDC: 1554212, 1; 1473507, 2.