Development of EPR spectroscopy of the d-element coordination compounds inthe Kurnakov Institute of General and Inorganic Chemistry RAS

The results of EPR studies are reported for the d-element coordination comp ounds containing at least one chelate ligand. The following problems are di scussed: the influence of various factors such as the composition of coordi nation sphere, geometric structure, and distant substituents at the chelate ligands on the character of metal-ligand bond; hyperfine structure from th e central metal atoms and ligand atoms; electron delocalization in molecule s; specific features of the ore-ion complexation with chelating ligands; in fluence of the low-symmetry distortions of chelate group on the parameters of spin Hamiltonian and rotational isomerism; stabilization of the unusual oxidation states of metal atom in coordination compounds; exchange interact ions in cluster compounds; cis and trans isomerism in the second coordinati on sphere of the copper(II) complexes with hydroxamic acids and anomalous l ine broadening in the EPR spectra of paramagnetic compounds in the presence of singlet dioxygen.