Influence of pseudohalide anions on the structural assembly of Cd(II) coordination polymers with 3,4-bis(3-pyridyl)-5-(4-pyridyl)-1,2,4-triazole.

Four Cd II coordination polymers, namely {[Cd(L 334 )(Cl) 2 ](CH 3 OH)} n ( 1 ), [Cd(L 334 )(Cl)(dca)] n ( 2 ), {[Cd(L 334 )(Cl) 1.33 (N 3 ) 0.67 ](H 2 O)} n ( 3 ), and {[Cd(L 334 )(SCN) 2 (H 2 O)](H 2 O) 1.5 (CH 3 OH)} n ( 4 ), have been synthesized by the conventional reactions of CdCl 2 and 3,4-bis(3-pyridyl)-5-(4-pyridyl)-1,2,4-triazole (L 334 ) or in the presence of different pseudohalides dicyanamide (dca), azide (N 3 ), and thiocyanate (SCN), respectively as auxiliary ligands. Complexes 1 – 3 exhibit the isostructural 2D layered network structures, whereas complex 4 shows a distinct 2D network with dimeric Cd II subunits. The structural discrepancy in 1 – 4 indicates the significant influence of pseudohalide anions on the structural assembly of Cd II coordination polymers with 3,4-bis(3-pyridyl)-5-(4-pyridyl)-1,2,4-triazole. In addition, thermogravimetric and fluorescent properties for all complexes and the ligand have also been investigated. [ABSTRACT FROM AUTHOR]