Hydrothermal synthesis, crystal structure and characterization of a new 1-D supramolecular ladder based on a binuclear Cd~(II) complex [Cd_2L_4(3,5-DNBA)_2](H_2O) with L as a bridging ligand (L = 3-(2-pyridyl)pyrazole; 3,5-DNBA = 3,5-dinitrobenzoate)

摘要

A new 1-D cadmium(II) mixed ligand dimer supramolecular ladder [Cd_2L_4(3,5-DNBA)_2]H_2O (1), (L = 3-(2-pyridyl)pyrazole and 3,5-DNBA = 3,5-dinitrobenzoate) was synthesized by hydrothermal methods. X-ray structural analysis of complex 1 revealed that two cadmium(II) cores are bridged by two deprotonated pyrazole groups of L, leading to dinuclear cadmium(II) [Cd_2L_4(3,5-DNBA)_2]. The dimers are joined by hydrogen-bonding interactions between two different cadmium(II) dimers to form a one-dimensional ladder-like framework and stabilized by weak pie-pie interactions. Moreover, the fluorescence spectrum of compound 1 exhibits blue fluorescent emission in the solid state at room temperature.