A novel reduced alpha-Keggin type polyoxometalate coordinated to two and a half copper complex moieties: [Cu(2,2 '-bipy)(2)][(PMo8Mo4O40)-Mo-VI-O-V {Cu(2,2 '-bipy)}(2.5)]center dot H2O

摘要

A novel reduced polyoxometalate derivative [Cu(2,2'-biPY)(2)][(PMo8Mo4O40)-Mo-VI-O-V{Cu(2,2'-bipy)}(2.5)]-H2O 1 has been hydrothermally synthesized and characterized by IR and XPS spectra, TG analysis and single-crystal X-ray diffraction. Compound 1 crystallizes in the monoclinic system, space group P2(1)/c, a=21.620(4) angstrom, b=19.070(4) angstrom, c=17.810(4) angstrom, beta=109.99(3)degrees, V=6901(2) angstrom(3), Z=4. The result of structure determination shows that the reduced alpha-Keggin polyoxoanion [(PMo8Mo4O40)-Mo-VI-O-V](7-) is capped by two divalent Cu atoms through four bridging oxo groups on two opposite {Mo4O4} faces or pits and supports a half {Cu(2,2'-bipy)} complex via the surface bridging oxygen atoms. (c) 2005 Elsevier B.V. All rights reserved.