EPR and optical absorption studies on VO2+ ions in zinc lactate trihydrate

Electron paramagnetic resonance and optical study of VO2+-doped zinc ammonium phosphate hexahydrate single crystals

“…Equations ( 2)-( 4), obtained considering |x y as the ground state (discussed later), yield the parameter values as: Dq = 1497, Ds = −2524, and Dt = 940 (in cm −1 ). These values are in agreement with the values reported for a lattice under strong tetragonal distortion (C 4ν symmetry) [46] and compare well with those listed in table 5 for other host lattices [13,17,18,24,[26][27][28][29][30][31][32].…”

“…In different crystal field environments, interesting changes in EPR spectra have been found due to vanadyl ions and these changes are reflected in the values and anisotropy of the g and A tensors. Due to this, VO 2+ ions are used extensively in EPR studies as dopants in different lattices [9][10][11][12][13][14][15][16][17][18][19][20] to investigate defect properties, structural changes and host lattice effects on molecular ions. Since the VO 2+ ion shows different types of absorption spectra depending upon the type of site symmetry of the complexes, valuable information can be obtained from electronic spectral data [21][22].…”

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

“…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. The present paper reports the X-band EPR and optical absorption studies on VO 2+ ion in diglycine calcium chloride tetrahydrate (DGCCT) single crystal at room temperature.…”

Magneto-optical activity of crude oil and its heavy fractions

“…In most cases, the visible and UV spectra are described by rather smooth curves [3], which do not contain characteristic peaks and, therefore, are considered to be less infor mative. However, the absence itself of characteristic features in these spectra is directly related to the prop erties of heavy oil fractions.…”

“…A strong covalent bond, which is deter mined by a short V-O distance, leads to an axial dis tortion of the nearest environment of the vanadium ion and, as a consequence, to a strong dependence of optical and magnetic resonance spectra on the proper ties of the compound that contains VO 2+ complexes. This particular feature allowed researchers to success fully use the ESR method and the optical absorption spectroscopy for obtaining information on the local symmetry, degree of covalence, structure of electron levels, presence of defects in the matrix, etc., in com pounds that contain vanadyl complexes (e.g., [3][4][5]). …”