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Effect of pH on the construction of Cd II coordination polymers involving the 1,1′‐[1,4‐phenylenebis(methylene)]bis(3,5‐dicarboxylatopyridinium) ligand
Author(s) -
Shao Zhi-Chao,
Meng Xiang-Ru,
Hou Hong-Wei
Publication year - 2019
Publication title -
acta crystallographica section c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 17
ISSN - 2053-2296
DOI - 10.1107/s2053229619010192
Subject(s) - methylene , ligand (biochemistry) , chemistry , coordination polymer , coordination complex , polymer , medicinal chemistry , stereochemistry , crystallography , crystal structure , organic chemistry , biochemistry , receptor , metal
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′‐[1,4‐phenylenebis(methylene)]bis(3,5‐dicarboxylatopyridinium) ( L 2− ), namely catena ‐poly[[[tetraaquacadmium(II)]‐μ 2 ‐1,1′‐[1,4‐phenylenebis(methylene)]bis(3,5‐dicarboxylatopyridinium)] 1.66‐hydrate], {[Cd(C 22 H 14 N 2 O 8 )(H 2 O) 4 ]·1.66H 2 O} n , (I), and poly[{μ 6 ‐1,1′‐[1,4‐phenylenebis(methylene)]bis(3,5‐dicarboxylatopyridinium)}cadmium(II)], [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 2− ligands, forming a one‐dimensional chain structure. In the crystal, these chains are further connected through O—H…O hydrogen bonds, leading to a three‐dimensional hydrogen‐bonded network. In polymer (II), each hexadentate L 2− ligand coordinates to six Cd II ions, resulting in a three‐dimensional network structure, in which all of the Cd II ions and L 2− ligands are equivalent, respectively. The IR spectra, thermogravimetric analyses and fluorescence properties of both reported compounds were investigated.