Three d(10) coordination polymers assembled from 3,5-bis(imidazole-1-yl)pyridine and different polycarboxylates: Syntheses, structures and luminescence properties

摘要

Three novel Zn(II)/Cd(II) coordination polymers, [Cd-2(bip)(2)(m-bdc)(2)(H2O)(2)center dot 3H(2)O](n) (1), [Zn-2(bip)(2)(pbdc)(2)center dot 2.5H(2)O](n) (2) and [Zn(bip) (p-bdc)center dot 3H(2)O](n) (3), where bip = 3,5-bis(imidazole-1-yl) pyridine, m-H(2)bdc = 1,3-benzenedicarboxylic acid, p-H(2)bdc = 1,4-benzenedicarboxylic acid, have been successfully synthesized under solvothermal conditions. The linkage of different ligands with Cd(II) ions in compound 1 affords a (3,5)-connected layer. Furthermore, 2D/3D parallel polycatenation occurs wherein the layers are polycatenated with the adjacent two parallel layers to form a 3D framework. In 2 and 3, the poly-carboxylates act as pillars to combine the metal-bip chains, yielding the layered structures. These 2D networks are extended to the final 3D supramolecular architectures by pi-pi stacking interactions. The results show that bip can act as a versatile building block for the construction of various coordination polymers. Moreover, the fluorescent properties of 1-3 in the solid state at room temperature have been investigated. (C) 2017 Elsevier Masson SAS. All rights reserved.