Effect of pH on the construction of Cd^II coordination polymers involving the 1,1′-[1,4-phenylenebis(methylene)]bis(3,5-dicarboxylatopyridinium) ligand

Abstract

Changing the pH value of a reaction system can result in polymers with very different compositions and architectures. Two new coordination polymers based on 1,1 0 -[1,4-phenylenebis(methylene)]bis (3,5- [Cd(C 22 H 14 N 2 O 8 )] n , (II), have been prepared in the presence of NaOH or HNO 3 and structurally characterized by single-crystal X-ray diffraction. In polymer (I), each Cd II ion is coordinated by two halves of independent L 2À ligands, forming a one-dimensional chain structure. In the crystal, these chains are further connected through O-HÁ Á ÁO hydrogen bonds, leading to a three-dimensional hydrogen-bonded network. In polymer (II), each hexadentate L 2À ligand coordinates to six Cd II ions, resulting in a three-dimensional network structure, in which all of the Cd II ions and L 2À ligands are equivalent, respectively. The IR spectra, thermogravimetric analyses and fluorescence properties of both reported compounds were investigated.

Synthesis and Structure Elucidation of Two Essential Metal Complexes: In-Vitro Studies of Their BSA/HSA-Binding Properties, Docking Simulations, and Anticancer Activities

“…Furthermore, relatively strong π–π interactions can be found between the tetrazole rings of adjacent layers. In complex 2 , the distance between two adjacent centroids is 3.4909(10) Å, which is within the normal range for π–π interactions [ 35 , 36 , 37 ]. Similar to complex 2 , the centroid–centroid distance is 3.4977(12) Å in complex 1 .…”