The electron spin resonance of MnO4 2- has been studied at 4.2 K in single crystal K2SO4. The principal values of the g and A tensors are gx=1.9757, gy=1.9696, gz=1.9445, Ax=-21.0×10-4 cm-1, Ay=-25.5×10-4 cm-1, and A z=-147.6×10-4 cm-1. Az and gz make an angle of 7.8° and the only element of symmetry in the MnO4 2- tetrahedron is a xz mirror plane. The ground state is dxy similar to that of MnO4 2- in K 2CrO4 but different from the dz2 ground state of MnO4 2- in BaSO4 and BaSeO4. It is suggested that a dz2 ground state will be stabilized whenever the host XO4 tetrahedron is distorted so that the angle O(1)-X-O(2) is greatly different from the angle O(3)-X-O(3′) where O(l) and O(2) lie in the mirror plane.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry