Hydrothermal Syntheses and Crystal Structures of Two Novel,Hybrid Materials Based on Secondary Transition-Metal-lncorporated Polyoxovanadate Cluster Backbones:[Cd(dien)_2]_2[(dien)CdAs_8V_(13)O_(41)(H_2O)]centre dot4H_2O and [Cd(en)_2]_2[(en)_2Cd_2As

摘要

Two new cadmium-substituted polyoxovanadates of [Cd(dien)_2]_2[(dien)CdAs_8V_(13)O_(41)(H_2O)]cemtre dpt4H_2O (1) and [Cd(en)_2]_2-[(en)_2Cd_2As_8V_(12)O_(40)] (2),where dien is diethylenetriamine and en is ethylenediamine,have been hydrothermally synthesized and structurally characterized by elemental analyses,IR spectra,EPR spectra,XRD spectra,TG analyses,magnetic properties,and X-ray crystallography.Single-crystal X-ray diffraction analyses reveal that compounds 1 and 2 possess a discrete and 1D structure,respectively.The former contains an inorganic-organic hybrid monocadmium-substituted polyoxovanadate cluster unit that is derived from the well-known {As_8V_(14)O_(42)} cluster,whereas the latter is composed of an inorganic-organic hybrid bicadmium-substituted polyoxovanadate cluster unit that is derived from the well-known {As_8V_(12)O_(40)} cluster.