Solvothermal Syntheses and Characterization of Three One-dimension Cadmium Selenidoarsenates [Ni(1,2-dap)3][As2CdSe4],[Zn(1,2-dap)3][As2CdSe4] and [Ni(en)3][As2CdSe4]

Three new cadmium selenidoarsenates,[Ni(1,2-dap)₃] [As₂CdSe₄](1)(1,2-dap=1,2-diaminopropane),[Zn(1,2-dap)₃] [As₂CdSe₄](2) and[Ni(en)₃] [As₂CdSe₄](3)(en=ethylenediamine), were synthesized under solvothermal conditions. And they are isostructural and monoclinic crystalls. As seen from their structures,they exhibited one-dimensional(1D) chains composed of[As₂CdSe₄]^2- anions and[TM(amine)₃]²⁺(TM=Ni, Zn; amine=1,2-dap, en) cations. Their absorption edges are 2.32, 1.84 and 2.38 eV, and they show the properties of the semiconductor. These compounds were also characterized by means of single-crystal X-ray diffraction(XRD), powder X-ray diffraction (PXRD), solid-state optical absorption spectrometry, and so on.