The EPR evidence of local hydrogen bond distortion evoked by ions in crystals

Abstract

An investigation of the influence of the proton subsystem on the EPR spectra of ions in is performed. The EPR superhyperfine structure from protons and their temperature dependences manifest the existence of asymmetrical configurations of protons at low temperatures. The preserving of the double-minimum character of proton potential on bonds in the near vicinity of ions is realized. It is suggested to be caused by redistribution of electron charges.

Site determination of vanadyl impurity in cadmium sodium sulphate hexahydrate: single crystal EPR and optical studies

“…Electron paramagnetic resonance (EPR) studies on the single crystals of paramagnetic ions doped in diamagnetic host lattices generally provide a detailed description of the nature of symmetry imposed by the ligands around paramagnetic ions [1,2]. The vanadyl ion has been used to study the symmetrical nature of paramagnetic ions in the crystal lattice, the bonding nature with the ligands [3][4][5] and the structural phase transitions of the host lattice, because it is the most stable oxy-cation among the paramagnetic transition metal ions [6][7][8][9][10][11][12][13][14][15][16][17][18]. Cadmium sodium sulphate hexahydrate (CSSH) lattice is selected to understand the nature of the vanadyl impurity.…”

Identification of doped paramagnetic vanadyl impurity in dipotassium diaquabis(malonato-κ2O,O′) zincate dihydrate single crystal using EPR and optical techniques

“…Even though the vanadium can exist in several oxidation states, the tetravalent vanadyl ion has been the subject of investigation by many authors, because of its interesting results furnished by the orientation of the short V=O bond in the lattice [6]. As the EPR spectrum is very sensitive to the crystalline environment, extensive EPR studies on VO(II) ions have been carried out in a variety of lattices [7][8][9][10][11][12][13][14].…”