Journal
TRANSITION METAL CHEMISTRY
Volume 31, Issue 3, Pages 340-346Publisher
SPRINGER
DOI: 10.1007/s11243-005-6432-x
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Two new neutral Keggin-polyoxometalate derivatives: [{Co(2,2'-bipy)(2)(H2O)}(2)] -[PMoVI Mo-7(V) O-5(40)(V-IV O)(2)] ( 1) and [{Ni( phen)(2)(H2O)}(2)](H3O) [PMoVI Mo-10(V) O-2(40)] center dot 4H(2)O ( 2) have been synthesized under hydrothermal conditions and characterized by i. r., t. g. analysis, x. p. s. spectra and single-crystal X-ray diffraction. In the case of ( 1), the polyoxoanion cluster [PMo12O40](8-) is capped by two vanadium atoms via four bridging oxo groups on two opposite {Mo4O4} pits of the Keggin polyoxoanion. Two {Co (2,2'-bipy)(2)(H2O)} fragments are supported on the two vanadium atoms through two terminal oxygen atoms from two vanadium atoms. In ( 2), two {Ni(phen)(2)(H2O)}(2+) moieties are linked to the molybdophosphate cluster [ PMo12O40] core to form a neutral bimetallic cluster. Furthermore, through the linkages of pi - pi stacking interactions and hydrogen bond contacts, extended three-dimensional supramolecular networks in the solid of ( 1) and ( 2) were formed.
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