Magnetic and electronic properties of the iron-containing polyoxotungstate [Fe-4(H2O)(10)(beta-SbW9O33)(2)](6-)

Abstract

The magnetic and x-ray photoelectron spectroscopy (XPS) studies on the transition metal substituted, dimeric polyoxotungstate [Fe-4(H2O)(10)(beta-SbW9O33)(2)](6-) are reported. The magnetic data were analyzed by using an isotropic Heisenberg Hamiltonian. The ground state of the frustrated molecule has a total spin of S=2. The XPS Fe 2p spectra suggest a 2+ formal valence state. The deviation from the contained Fe3+ ions can be explained by charge-transfer effects. (C) 2006 American Institute of Physics.