Abstract
A low spin ${d}^{7}{\mathrm{Rh}}^{2+}$ center in NaCl with nearly axial symmetry is studied using Q-band electron nuclear double resonance. The analysis of the interaction of the unpaired electron with the first shell ${\mathrm{Cl}}^{\mathrm{\ensuremath{-}}}$ ions along the ${g}_{z}$ axis of the complex proves that the center has ${C}_{2v}$ symmetry, strongly supporting its identification as a $[{\mathrm{RhCl}}_{6}{]}^{4\ensuremath{-}}$ complex accompanied by two next-nearest-neighbor cation vacancies in a cis configuration. In addition, the twofold symmetry axis of this complex is identified as the g tensor axis corresponding to the largest principal g value. The magnetic resonance properties of this center can be explained by assuming that the central ${\mathrm{Rh}}^{2+}$ ion exhibits an off-center displacement toward the cation vacancies.
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