An electron paramagnetic resonance (EPR) study on exchange coupling in thebimetallic chain compound copper(II) bisethylenediamine manganese(II) tetrachloride (CEMC) and interpretation of EPR linewidth data of two other Cu-Mn bimetallic chain compounds

Investigations of the linewidth, lineshape and intensity of the X-band EPR line observed in several crystallographic planes of the bimetallic chain co mpound copper(II) bis ethylenediamine manganese(II) tetrachloride (CEMC) ar e carried out at room and liquid nitrogen temperatures. The observed angula r anisotropy of the linewidth has been satisfactory explained on the basis of the anisotropic exchange model and of the effective spin S = 2 formalism . It is inferred that the CEMC crystal is well described as constituted of FM coupled Cu-Mn dimeric chains oriented parallel to the c-axis of the mono clinic crystal. Within each Cu-Mn dimer exchange coupling is, however, of A FM type. The above model has also been successfully applied to interpret an isotropic linewidth data obtained in two other Cu-Mn bimetallic chain monoc linic compounds, namely, MnCu (Dba) (H2O)(3).2H(2)O and MnCu(pbaOH) (H2O)(3 ).