Electron spin-echo studies of weak hyperfine interactions with ligands in some VO²⁺ complexes in frozen glassy solutions

Methods of envelope modulation function calculations in the case of paramagnetic centers having an axially symmetric g factor are described. Parameters of the hyperfine interactions between unpaired electrons of VO²⁺ ions and molecular deuterons have been obtained from the analysis of envelope modulation patterns for the two- and three-pulse electron spin echo of VO²⁺ complexes with D₂O, CH₃OD, and CD₃OH. On this basis structural parameters of the first coordination sphere of VO²⁺ complexes with water and methyl alcohol have been determined.