A NOVEL KEGGIN UNITS-SUPPORTED COMPLEX: SYNTHESIS, CHARACTERIZATION AND CRYSTAL STRUCTURE OF [(CH_3)_2NH_2]_6[Cu(DMF)_4(GeW_(12)O_(40))_2] centre dot 2DMF

摘要

A novel hybrid compound, [(CH_3)_2NH_2]_6[Cu(DMF)_4(GeW_(12)O_(40))_2] centre dot 2DMF, has been synthesized from H_4GeW_(12)O_(40) centre dot nH_2O, CuCl_2 and N,N-dimethylformamide (DMF) in aqueous solution and characterized by elemental analysis, UV and IR spectra. Single crystal X-ray structure analysis shows that the crystal consists of a alpha-Keggin heteropolyanion-supported anion [Cu(DMF)_4(GeW_(12)O_(40)~(4-))_2]~(6-), two free N,N-dimethyl-formamide molecules, six protonated dimethylamine (DMA) molecules, and that the coordinating atoms of DMF are the oxygen atoms of C=O group. Thermal analysis indicates that the thermal stability of the GeW_(12)O_(40)~(4-) anion in the title compound is stronger than that in acid.