The EPR spectra of powder samples of a number of metalorganic compounds containing Cu2+ ions are investigated. These compounds are characterized by the presence of identical chains of octahedra forming the local environment of Cu2+, but they differ strongly in their interchain ligand structure. The resonance absorption bands permit determination of the components of the effective g factor and linewidth of individual powder particles and also their temperature dependence. It is found that the orbital singlet |x2−y2〉 is the ground state of the copper ion in all the compounds, and the exchange interaction parameters in them are estimated. The maximum exchange is observed in the system with the simplest geometry of the interchain structure in the series of compounds studied.