Abstract
ENDOR measurements at 25 K have been used to determine the hyperfine coupling tensors for all ten protons in the VO(H2O)5 2+ ion in single crystals of Mg(NH4)2(SO4)26H2O. The traceless components of all the tensors are close to axial and their use in a point dipole treatment enables a very plausible geometrical model of the complex ion to be constructed. Six of the protons in the equatorial water molecules have substantial positive isotropic couplings and it is suggested that these reflect the direct admixture of hydrogen 1s components into the singly occupied orbital.
Published Version
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