Hydrothermal synthesis and characterization of a new three-dimensional hybrid zinc phosphate [Zn 2(HPO 4) 2(4,4′-bipy)]·3H 2O with neutral porous framework

Abstract

Employing 4,4′-bipyridine as a bridged ligand, a new three-dimensional (3-D) hybrid zinc phosphate [Zn 2(HPO 4) 2(4,4′-bipy)]·3H 2O has been prepared under hydrothermal conditions and characterized by single crystal X-ray diffraction. This compound crystallizes in the monoclinic space group C2/ c, with cell parameters, a = 21.188 ( 4 ) Å , b = 10.229 ( 2 ) Å , c = 9.0656 ( 18 ) Å , β = 90.21 ( 3 ) ° , V = 1964.8 ( 7 ) Å 3 and Z = 4 . The connectivity of the ZnO 3N and HPO 4 tetrahedra results in a 2-D neutral layer that with interesting 4,8 2 net along the bc plane. Furthermore, the 4,4′-bipyridine molecule links the 4,8 2 net into a 3-D structure. The water molecules sit in the middle of the channels and interact with the framework via hydrogen bonds. The compound exhibits intense photoluminescence at room temperature.