Two new d10 metal-directed coordination polymers based on an unsymmetrical ligand 3-pyrimidin-5-ylbenzoic acid

Abstract

Two novel d 10 metal coordination polymers [Cd(3,5-PMBC) 2 (H 2 O) 2 ] ( 1 ) and {[Zn(3,5-PMBC) 2 (H 2 O) 2 ]⋅2H 2 O} ( 2 ) (3,5-PMBC = 3-pyrimidin-5-ylbenzoic acid) have been synthesized under solvothermal conditions, and characterized by IR spectroscopy, powder and single crystal X-ray diffractions. In 1 and 2 , the d 10 metal ions (Zn 2+ and Cd 2+ ) directed the self-assemblies to form two types of significantly different coordination structures: 1 exhibits one-dimensional double-stranded chain, while 2 displays a unique two-dimensional undulated double layer. Both are further stacked via hydrogen-bond interactions to assemble three-dimensional supramolecular structures. Thermal and photoluminescent properties of 1 and 2 are also investigated in details. Two novel d 10 metal-directed coordination polymers [Cd(3,5-PMBC) 2 (H 2 O) 2 ] ( 1 ) and {[Zn(3,5-PMBC) 2 (H 2 O) 2 ]2H 2 O} ( 2 ) have been prepared and characterized. compound 1 exhibits one-dimensional double-stranded chain, while 2 displays an unique two-dimensional undulated double layer. Both are further stacked via hydrogen-bond interactions to form three dimensional supramolecular structures. ► Coordination polymers based on the unsymmetric ligand 3-pyrimidin-5-ylbenzoic acid are not reported so far. ► The first two novel d 10 metal coordination polymers [Cd(3,5-PMBC) 2 (H 2 O) 2 ] ( 1 ) and {[Zn(3,5-PMBC) 2 (H 2 O) 2 ]2H 2 O} ( 2 ) (3,5-PMBC = 3-pyrimidin-5-ylbenzolate) have been synthesized and structurally characterized. ► The strong fluorescence emissions for 1 and 2 have been observed in the solid state.