Chemical Research in Chinese Universities ›› 2015, Vol. 31 ›› Issue (2): 179-186.doi: 10.1007/s40242-015-5033-2

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Two New Supramolecular Hybrids Based on Bi-capped Keggin {PMo12V2O42} Clusters and Transition Metal Mixed-organic-ligand Complexes

DUAN Weijie, JIAO Shihui, LIU Xu, CHEN Jinlei, CAO Xuan, CHEN Yan, XU Wei, CUI Xiaobing, XU Jiqing, PANG Guangsheng   

  1. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China
  • Received:2015-01-26 Revised:2015-02-25 Online:2015-04-01 Published:2015-02-12
  • Contact: CUI Xiaobing, PANG Guangsheng E-mail:cuixb@jlu.edu.cn;panggs@jlu.edu.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China(No.21371066).

Abstract:

Two supramolecular compounds [Cu(imz)2][Cu(phen)(imz)]2{[Cu(phen)]2[PMo6VIMo6VV2IVO42]}(1) and [Co2(2,2'-bpy)4(C2O4)][Co(2,2'-bpy)3][PMo7VIMo5VV2IVO42](2,2'-bpy)0.5·H2O(2)(phen=1,10'-phenanthroline, imz= imidazole, 2,2'-bpy=2.2'-bipyridine) have been synthesized hydrothermally and characterized by elemental analyses, infrared spectrum, UV-Vis, X-ray photoelectron spectroscopy(XPS), electron spin resonance(ESR) spectra, thermogravimetry analyses and single crystal X-ray diffraction analyses. Single-crystal X-ray diffraction analyses revealed that both the compounds represent the examples of compounds based on the bi-capped Keggin polyoxoanion {PMo12V2O42} and transition metal mixed-organic-ligand coordination complexes. Compound 1 consists of bi-capped Keggin polyoxoanion [PMo12V2O42]5- supported copper coordination groups, which are further inter- connected with two types of copper complex fragments forming a 3D supramolecular framework via ππ stacking, C—H…O and N—H…O hydrothermal bonding interactions. Compound 2 is a new hybrid consisted of polyoxoanion [PMo12V2O42]4-, [Co2(2,2'-bpy)4(C2O4)]2+ and [Co(2,2'-bpy)3]2+. There are no direct interactions in compound 2, but the polyoxoanions together with two different cobalt complex groups construct a 3D supramolecular network through C—H…O hydrogen bonding interactions.

Key words: Transition metal mixed-organic-ligand complex, Keggin polyoxometalate, Hydrogen bond, π&pi, Stacking interaction