Syntheses, Crystal Structure and Fluorescence Properties of a Cd (Ⅱ) coordination polymer based on pyridinium zwitterionic ligand

Abstract

With pyridinium zwitterionic ligand H2LCl2 (1,1'-((2,3,5,6-tetramethyl-1,4-phenylene)bis(methylene))bis(4-carboxypyridin-1-ium)chloride) as the main connection point, a novel Cd (Ⅱ) coordination polymer namely [Cd(L)2(SO4)2(H2O)2][Cd(H2O)6]·4H2O (CP 1) and a partially deprotonated HLClO4·H2O were obtained by room temperature volatilization method. X-ray diffraction studies reveal that HLClO4·H2O crystallizes in the monoclinic P21/n space group, with a bowl shape partially deprotonated HL+ cation as the main structure, and the ClO4-anion which balances the charge just exists outside. When the ligand reacts with CdSO4‧8/3H2O, CP 1 crystallized in the triclinic P-1 space group with two distinct Cd (Ⅱ) centers was obtained. Abundant hydrogen bonds produce the 3D supramolecular structure of CP 1. Elemental analysis, powder X-ray diffraction, infrared spectrum, thermogravimetric analysis, solid-state fluorescence properties and CIE analysis of CP 1 were studied. Results indicate that the CP 1 has good thermal stability and has potential applications in blue luminescent materials.