Anion-induced structural varieties of Cu^II coordination complexes with 3-phenyl-4-(3-pyridyl)-5-(4-pyridyl)-1,2,4-triazole

Two CuII coordination complexes {[Cu(L430)(H2O)2](NO3)2}n (I) and {[Cu(L430)2(H2O)2](ClO4)2(H2O)0.3}n (II) have been synthesized based on 3-phenyl-4-(3-pyridyl)-5-(4-pyridyl)-1,2,4-triazole (L430) in the presence of different anions (CIF file CCDC nos. 1489348 (I) and 1489349 (II)). Notably, complex I shows a 2D coordination network while polymer II represents a 1D box-like structure. Further, extended supramolecular architectures are constructed via secondary interactions in both structures. The structural distinction on both compounds fully demonstrates the role of lattice anions NO3– or ClO4– in the assembly of infinite coordination solids. In addition, complex II exhibits some certain efficiency for dichromate (Cr2O72−) capture in the water system.