A series of new organic-inorganic compounds templated by the [SiW12O40]4- polyanion

Two couples of new compounds templated by the polyanion [SiW12O40](4-),[Hbix][Cu-1(bix)](3)[SiW12O40]center dot 4H(2)O (1) and [Cu-II(H2O)(Hbix)(2)(bix)](2)[Cu-II(H2O)(2)(Hbix)(2)(bix)][SiW12O40]3 center dot 4H(2)O (2) (bix = 1,4-Bis(imidazol-1-ylmethyl)benzene), [Cu-I(bbi)](4)[SiW12O40]center dot 2H(2)O (3) and [Cu-II(bbi(2))](2)[SiW12O40] (4) (bbi = 1,1'-(1,4-butanediyl)bis(imidazole)) were hydrothermally synthesized, and characterized by elemental analyses, IR spectroscopy, thermogravimetric analyses and single X-ray diffraction. Compounds 1 and 2 were synthesized from the same reactants but exhibited distinct structures which could be ascribed to the different ratios of the reactant bix to Cu-II. In compound 1, the higher ratio of bix results in the transformation of the Cu-II to Cu-I, the [SiW12O40](4-) templates direct the Cu-I-bix coordination polymers to form a 3D supramolecular framework with grid-like channels along two directions. The [SiW12O40](4-) templates in compound 2 locate in the voids of the 3D supramolecular network constructed by Cu-II-bix coordination polymers, which exhibits the interdigitation fashion in both the formation of the 2D layer and the 3D framework. Compounds 3 and 4 were synthesized similar to 1 and 2, except for the change of bix to bbi. In compound 3, the Cu-I-bbi polymers form a supramolecular metal-organic host framework with rhombic channels in which the SiW12 templates reside. Compound 4 shows a framework with hexagonal channels constructed by Cu-II-bbi coordination polymers which accommodated the SiW12 templates. (C) 2010 Elsevier Masson SAS. All rights reserved.