Magnetic properties of (.MU.-(ethylenediaminetetraacetato)-di-.MU.-sulfido-bis{oxomolybdate(V)})2- and (.MU.-(ethylenediaminetetraacetato)-di-.MU.-oxo-bis{oxomolybdate(V)})2- ions.

概要

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Sodium [μ-(ethylenediaminetetraacetato)-di-μ-sulfido-bis{oxomolybdate(V)}]·n-hydrates, n=2 and 3, are antiferromagnetic dimers with an exchange interaction within a pair of Mo(V) ions of about −140 k having an averaged g-value of about 2 for each Mo(V) ion. In these salts, magnetic moments of only about 0.5 Bohr magneton are localized at Mo(V) sites, though Mo(V) has one electron in the 4d orbital. Here a π-bonding looped structure is considered to have a contribution to the diamagnetic susceptibilities of about −5.0×10−5 (CGSemu). Sodium [μ-(ethylenediaminetetraacetato)-di-μ-oxo-bis{oxomolybdate(V)}]·n-hydrates, n=3, 4, and 6, are the antiferromagnetic dimers with an exchange interaction within a pair of Mo(V) ions of about −150 k and an averaged g-value of 1.91. The magnetic moments of only about 0.5 Bohr magneton are localized at Mo(V) sites. In these salts, too, a π-bonding structure in each dimer is considered to make a contribution to the diamagnetic susceptibility of about −4.0×10−5 (CGSemu). A broad minimum of the molar magnetic susceptibility of [μ-(ethylenediaminetetraacetato)-di-μ-oxo-bis{oxomolybdate(V)}] salts was considered due to the conformation interconversion.
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