Quantitative EPR studies of transition metal ions in oxide, aluminosilicate and polymer matrices
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The importance of the proper choice of diamagnetic diluent used for preparation of standards for quantitative EPR measurements is shown by the example of CuSO4 and VOSO4 standards. The results of determination of the stability of chemical composition of VOSO4-K2SO4 standards stored for various periods of time, performed by different analytical methods, are compared. The examples are given to illustrate application of quantitative EPR measurements in the studies of structure and properties of transition metal ions dispersed in various matrices. Changes in the coordination sphere of surface transition metal ions occurring upon adsorption of gas molecules, the degree of dispersion of these ions and the extent of Mn+−Mn+ interactions derived from quantitative EPR measurements are described. The results of investigation of the mechanism of adsorption and catalytic reactions occurring on dispersed transition metal ions are presented.
KeywordsAcrylic Acid Vanadyl Sulfate Seal Quartz Tube Paramagnetic Substance Integral Signal Intensity
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