Different aliphatic dicarboxylates affected assemble of new coordination polymers constructed from flexible–rigid mixed ligands

Abstract

In this article, seven coordination polymers: [Cd(C 5H 6O 4)(C 10H 8N 2)] n ( 1), [Zn(C 5H 6O 4)(C 10H 8N 2)] n ( 2), [Cd(C 6H 8O 4)(C 10H 8N 2)] n ( 3), {[Mn(C 10H 8N 2)(H 2O) 4] (C 4H 4O 4)·4H 2O} n ( 4), [Mn 5(C 4H 4O 4) 4(O)] n ( 5), [Cd(C 4H 4O 4)(C 10H 8N 2)(H 2O)] n ( 6) and [Zn(C 6H 6O 4)(C 12H 8N 2)(H 2O)] n ( 7) were synthesized and characterized by single-crystallographic X-ray diffraction. Compounds 1 and 2 are two-dimensional layers connected by glutarate anions and 4,4′-bpy. Unlike compounds 1 and 2, compound 3 is a two-fold interpenetration network. Compound 4 is a one-dimensional chain-like structure, which is further extended to two-dimensional supramolecular layer structure with hydrogen bond. During the synthesis of compound 4, to our surprise, we got compound 5; compound 5 is an interesting three-dimensional network composed of pentanuclear Mn(II) building units and succinate anions. Compound 6 is also a two-dimensional supramolecular layer structure composed of one-dimensional chain-like structure with hydrogen bonds and Π–Π interactions. Compound 7 is also a one-dimensional chain-like structure, which is further connected with the same kind of interaction to generate two-dimensional supramolecular layer structure. Furthermore, compounds 1 and 2 both exhibit fluorescent property at room temperature.