title: An organic-inorganic hybrid semiconductor material based on Lindqvist polyoxomolybdate and a tetra-nuclear copper complex containing two different ligands.
abstract: A 3D organic-inorganic hybrid compound based on the Lindqvist-type polyoxometalate, [{Cu(phen)}3{Cu(μ2-ox)3}{Mo6O19}] (1) (phen = 1,10-phenanthroline, ox = oxalate), has been synthesized under hydrothermal conditions and structurally characterized by elemental analysis, IR, TG, PXRD, XPS, UV-vis, and single-crystal X-ray diffraction. In compound 1, three C2O4(2-) ligands bridge one Cu atom and three Cu(phen) fragments to form a tetra-nuclear copper(II) coordination complex [{Cu(phen)}3{Cu(μ2-ox)3}](2+) unit. The six-node [Mo6O19](2-) clusters are interweaved by the 6-connected tetranuclear copper(II) complex units into an intricate 3D network structure, exhibiting a 4(12)·6(3)-nbo (sodium chloride-type) topology. Compound 1 exhibits the highest connectivity of Lindqvist-type POM hybrid materials. The electrochemical behavior of 1-CPE has been investigated in detail. Furthermore, a diffuse reflectivity spectrum of 1 reveals the presence of an optical band gap and the nature of semiconductivity with a large energy gap. A magnetic susceptibility study reveals predominant antiferromagnetic interactions between the Cu(II) bridge units.
authors.affiliation: Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, School of Chemistry and Chemical Engineering, Harbin Normal University, Harbin 150025, People's Republic of China. hlyukai188@163.com zhou_bai_bin@163.com.
authors.forename: Zhi-Kun
authors.initials: ZK
authors.lastname: Qu
authors.forename: Kai
authors.initials: K
authors.lastname: Yu
authors.forename: Zhi-Feng
authors.initials: ZF
authors.lastname: Zhao
authors.forename: Zhan-hua
authors.initials: ZH
authors.lastname: Su
authors.forename: Jing-Quan
authors.initials: JQ
authors.lastname: Sha
authors.forename: Chun-Mei
authors.initials: CM
authors.lastname: Wang
authors.forename: Bai-Bin
authors.initials: BB
authors.lastname: Zhou