Magnetic properties of N,N′-ethylenebis(salicylideneiminato) copper(II)

Abstract

This paper reports the electron paramagnetic resonance spectra and magnetic susceptibility data on N,N′-ethylenebis(salicylideneiminato)copper(II). The results show that the ground state of the complex is of triplet multiplicity with the first excited state being a singlet, at 18·5 cm −1 higher in energy. EPR measurements confirm the existence of spin-spin coupling, and a value of D = 0·0365 cm −1 was obtained from the low-field parallel lines. The g value obtained from the triplet state spectra were g ∥ = 2·244, g ⊥ = 2·025, and 〈g〉 = 2·098. Cryomagnetic measurements for the low-temperature range 3·7–61°K in conjunction with a best fitting procedure yielded the magnetic parameters 2 J = +18·5 cm −1 and π = −2·15°K. A superexchange mechanism based on both intraatomic and interatomic electron transfer is proposed to account for the experimental data.