An acid-base resistant polyoxometalate-based metal–organic framework constructed from {Cu4Cl}7+ and {Cu2(CO2)4} clusters for photocatalytic degradation of organic dye.

The construction of acid-base resistant materials for elimination of organic contaminations in water under the sunlight conditions is very important for the protection of our living surroundings. Metal-organic frameworks (MOFs) are promising candidates for photocatalytic applications, but many of them suffer from poor framework stability under the acidic or basic conditions. In this study, by using a bifunctional ligand 4-(4-carboxyphenyl)-1,2,4-triazole (HCPT) featuring both carboxylate and azole groups, a new polyoxometalate-based MOF formulated as {[Cu 8 Cl 5 (CPT) 8 (H 2 O) 4 (HSiW 12) (H 2 O) 20 (CH 3 CN) 4 } n (1) has been prepared via a solvothermal approach. Complex 1 shows a 3D 2-fold interpenetrating scu -type network based on the four-connected {Cu 2 (CO 2) 4 } and eight-connected {Cu 4 Cl}7+ clusters, and could be stable in a wide range of pH values f0 to 14). Apart from its excellent framework stability, complex 1 shows a high photocatalytic efficiency for the degradation of rhodamine B (RhB) by visible light irradiation and nearly 97% of the RhB was degraded within 70 ​min. To our knowledge, complex 1 represents the first case of polyoxometalate-based MOFs constructed from the mixed-cluster units. A new polyoxometalate-based MOF has been prepared via using a bifunctional ligand 4-(4-carboxyphenyl)-1,2,4-triazole featuring both carboxylate and azole groups. The as-prepared MOF shows a 3D 2-fold interpenetrating scu -type network based on the four-connected {Cu 2 (CO 2) 4 } and eight-connected {Cu 4 Cl}7+ clusters, and could be stable in a wide range of pH values (0–14). This MOF shows a high photocatalytic efficiency for the degradation of rhodamine B (RhB) by visible light irradiation with nearly 97% of the RhB was degraded within 70 ​min, and it represents the first case of polyoxometalate-based MOFs constructed from the mixed-cluster units. Image 1 [ABSTRACT FROM AUTHOR]