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Abstract: Two isostructural 3D coordination polymers (CPs) {[M(L242)2](ClO4)2} n (MII=CdII for 1 and ZnII for 2) have been constructed from metal perchlorates and a tripyridyltriazole ligand 4-(4-pyridyl)-3,5-bis(2-pyridyl)-1,2,4-triazole (L242). The host framework of each CP comprises two interpenetrating lvt topological networks. Three types of 1D channels with different chirality (achirality and left-handed or right-handed helicity) are observed to hold the perchlorate guest anions. Interestingly, both CPs materials have the exclusive and irreversible anion-exchange behaviors for acetate (OAc−), which however, are unavailable to chloride (Cl−), fluoroborate (BF4 −), or nitrate (NO3 −) anion. CPs 1 and 2 also show ligand-based solid-state fluorescent emissions at room temperature. [Copyright &y& Elsevier]

Abstract: To investigate the effect of positional isomerism of ligands on the construction of coordination polymers, three Cd(II) complexes with tripyridyltriazole tectons and thiocyanate anions have been prepared and characterized, namely, [Cd(L 4 )(μ-SCN)(SCN)] n (1), [Cd(L 5 )(SCN)2] n (2), and [Cd(L 6 )(μ-SCN)2] n (3) (L 4 =3,4-bis(2-pyridyl)-5-(3-pyridyl)-1,2,4-triazole, L 5 =3-(2-pyridyl)-4,5-bis(3-pyridyl)-1,2,4-triazole, and L 6 =3-(2-pyridyl)-4-(4-pyridyl)-5-(3-pyridyl)-1,2,4-triazole. Crystal structure analysis indicates that the isomeric effect of ligands plays a crucial role in regulating the distinct 1D coordination patterns for 1–3, with the aid of the versatility of thiocyanate anion. The solid-state properties such as thermal stability and fluorescence of 1–3 have also been studied. [Copyright &y& Elsevier]

Abstract: Under hydrothermal conditions using a triazole derivative ligand 3-carboxylic acid-4H-1,2,4-triazole (HL) and corresponding lead(II) salts, a novel two-dimensional(2D) lead(II) complex {[Pb(L)(μ2-Cl)(H2O)} n (1) has been isolated. In 1 Pb2Cl2(H2O)2 building blocks can be observed, which are extended by tetra-dentate coordinated L ligands to form a 2D corrugated layered structure. 1 also represents a novel example of luminescent lead(II) frameworks with triazole derivatives. Solid-state fluorescence spectrum of 1 exhibits the excited peak at 376nm while the emission peak at 604nm. [Copyright &y& Elsevier]