Electron Paramagnetic Resonance of VO2+ in M2Zn(SeO4)2 · 6H2O(M=K, Rb) Single Crystals

The EPR spectrum of VO2+ has been studied in single crystals of K2Zn(SeO4)2 · 6H2O and Rb2Zn(SeO4)2 ∼ 6H2O at ∼9.45 GHz. VO2+ substitutes for Zn2+ have preferential orientations in the lattice. The V = O of the intense vanadyl center is nearly along the longest ZnH2O direction. Spin-Hamiltonian parameters have been evaluated from single crystal as well as from powder spectra.