title: Single crystal EPR study of VO(II) in magnesium potassium phosphate hexahydrate: a case of two substitutional vanadyl ions.
abstract: Single crystal EPR study of VO(II)-doped magnesium potassium phosphate hexahydrate has been carried out at room temperature. Single crystal rotations in the three orthogonal planes indicate that the paramagnetic impurity has entered the lattice in place of magnesium ions by replacing the equatorial and axial coordinated water molecules. The spin Hamiltonian parameters obtained for the two substitutional sites are: site 1: g1=1.9800, g2=1.9774, g3=1.9296, A1=7.25 mT, A2=8.09 mT, A3=18.69 mT and site 2: g1=1.9802, g2=1.9765, g3=1.9296, A1=6.82 mT, A2=8.48 mT, A3=18.75 mT, respectively. Superhyperfine, from protons of ligand water molecules, has been observed at certain orientations. It has been concluded that VO bond directions of the two substitutional ions are orthogonal to each other.
authors.affiliation: Department of Chemistry, Pondicherry University, Pondicherry 605 014, India.
authors.forename: S
authors.initials: S
authors.lastname: Deepa
authors.forename: K
authors.initials: K
authors.lastname: Velavan
authors.forename: I
authors.initials: I
authors.lastname: Sougandi
authors.forename: R
authors.initials: R
authors.lastname: Venkatesan
authors.forename: P
authors.initials: P
authors.lastname: Sambasiva Rao
mesh_terms: D003460:Crystallization; D004578:Electron Spin Resonance Spectroscopy; D007501:Iron; D017616:Magnesium Compounds / Q000737:chemistry*; D010710:Phosphates / Q000737:chemistry*; D014638:Vanadates / Q000737:chemistry*
chemical_list: D017616:Magnesium Compounds; D010710:Phosphates; D014638:Vanadates; D007501:Iron