X-Ray Absorption Fine Structure Spectroscopic Study of (NH4)(2)ReF6
SN Applied Sciences
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The (NH4)(2)ReF6 (X= F, Cl, Br, I) salts have been investigated by x-ray absorption fine structure spectroscopy. The Re-F distance determined by EXAFS in (NH4)(2)ReF6 (i.e., 1.95 angstrom) is in good agreement with the one determined by single crystal x-ray diffraction in A(2)ReF(6) salts (A= K, Rb, Cs). The XANES studies of (NH4)(2)ReF6 (X= F, Cl, Br, I) indicates that the positions of the absorption edge and of the white line are shifted to higher energy when moving from Ito F. These shifts have been explained in terms of the crystal field splitting parameter and covalent charge carried by the Re atoms. Calculations of the XANES spectra of the ReX62- (X= F, CI, Br, I) anions at the Re-L-3 edge have been performed and the calculated shifts and intensity of the white lines reproduce well the experimental observations.
Rhenium; Halogen; Fluorine; X-ray absorption fine structure spectroscopy
Chemistry | Physical Sciences and Mathematics | Radiochemistry
Mariappan Balasekaran, S.,
Sattelberger, A. P.
X-Ray Absorption Fine Structure Spectroscopic Study of (NH4)(2)ReF6.
SN Applied Sciences, 1(11),