EPR and optical absorption studies of vanadyl ions in potassium oxalate monohydrate

Directed Self‐Assembly, Symmetry Breaking, and Electronic Modulation of Metal Oxide Clusters by Pyramidal Heteroanions

“…160 mT, with the outermost hyperfine lines being clearly resolved. This subspectrum is characteristic of a monovanadium(IV) with its axial symmetry where the parallel hyperfine component, A ∥ , is larger than perpendicular component, A ⊥ (see below) . There are at least three components that comprise the EPR spectrum of 4 , with the broad lines on the isotropic component and a miniscule contribution from two axial signals identical to that seen in 2 .…”

“…The spectrum of 3 was simulated as a single S= 1 / 2 species with a large linewidth that masks the anisotropy and rhombicity of the principal g ‐values. As such it shows the greatest departure from axiality when compared with a single V IV center in related POMs such as [PV IV W 11 O 40 ] 5− ; however, orthorhombic spectra have been diagnosed in related Dawson structures, and more notably in [VO] 2+ ‐doped single crystals . The most stark difference are the small hyperfine coupling constants, which are uniformly smaller than for the single oxovanadium(IV) species, which is to say the A ‐anisotropy remains the same but there is less spin density on the V IV ion.…”

EPR and optical studies of VO2+ doped diglycine calcium chloride tetrahydrate single crystals

“…The optical absorption study provides the structure of energy levels of the metal ion and crystal field parameters. It is also interesting and productive to study the local symmetry and the bonding of the vanadyl complex by correlating EPR and optical absorption data [8][9][10]. EPR and optical studies on VO 2+ ion in a variety of host lattices have been reported [11][12][13][14][15] earlier.…”

Molecular structure identification and position of a dopant ion in diaqua(2,2′-bipyridine)malonatozinc(II) by spectroscopic studies – II: VO(II)

“…Out of these, VO(II), with a single unpaired 3d electron bound to an oxygen atom by a strong bond was well studied. The preferential orientation of the V@O bond in different complexes depends on the type of the ligands [10][11][12][13][14][15][16][17]. Single crystal EPR studies also revealed the location of paramagnetic impurity, i.e., interstitial, substitutional or both.…”