Syntheses, Crystal Structures and Properties of Two Novel Mixed Anion Hybrids with Formulas of Pb6O2(BO3)2(C2O4) and Pb4(CO3)2(C2O4)(OH)2

Abstract

AbstractIt has been regarded as an ideal strategy to design and synthesize new compounds by combining different functional groups together. Based on numerous experiments, it is successful to assemble two kinds of mixed anion groups together and obtain two novel mixed‐anion hybrids, namely, Pb6O2(BO3)2(C2O4) (1) and Pb4(CO3)2(C2O4)(OH)2 (2) under hydrothermal condition. In compound 1, three oxolead polyhedra share edges into a Pb3O6 cluster which is further connected by other four similar ones via corner‐sharing into 2D fluctuant square layers. BO3 units fill in the voids of oxolead layers into [Pb6O2(BO3)2]2+ layers which are connected by C2O42− anions into a 3D structure. Compound 2 displays [Pb4(CO3)2(OH)2]2+ layers which can be described as an alternating connection of [PbO6(OH)] and flat [CO3] triangles and are further linked by C2O42− anions into 2D Pb4(CO3)2(C2O4)(OH)2 layered framework. Photoluminescent investigations indicate that their emission spectra consist of several broad bands centered around 430, 620 nm and 450, 610, 720 nm for compounds 1 and 2, respectively. And interestingly, the intensity of the emission bands can be tuned through changing the excitation wavelengths.