Abstract: The EPR spectra of binuclear copper (Ⅱ) cluster
·4DMF (1)
in solide and solution at room temperature and 77K have been measured. Three groups of lines are observed. They are attributed to two station of the unpaired elec-tron, in the title compound respectively. One is similar to those of a mononuclcar copper sen which present spectra of groups Ⅰ and Ⅱ, while the spectrum of group Ⅲ manifests itself as a triplet state of two coppers coupling dimer.
In this paper, the EPR parameters for the triplet state of dimeric copper are calculated by spin Hamiltonian formula H_S=βHgS+DS_z²+E(S_x²-S_y²)-(2)/3D
By comparison of the title compound (1) with
·4DMF (2)
it is found that there are some differences in the ligand structure, i. e. the difference in the position of Benzenering connecting to CH₃ (the former, meta whereas the latter, patra), resulting in the differences of magnetic parameters (effect magnetic mo ment, parameter of the magnetic exchange interaction J, relative electron spin concentration ρ and h. f. s. parameters).

Key words: Binuclcar copper cluster, EPR, Triple state effect magnetic moment