Electron spin resonance study of the manganese(II) chelate of tetrasodium 3,10,17,24-tetrasulphonatophthalocyanine

Abstract

The manganese(II) chelate of 3,10,17,24-tetrasulphonatophthalocyanine exists in aqueous solution in high-spin and low-spin forms, with the low-spin form being favoured in slightly alkaline solution as a result of an axial interaction of the central mangenese(II) with the hydroxide anion. The low-spin form of the chelate possesses a characteristic e.s.r. spectrum from which the magnetic spin Hamiltonian parameters have been obtained by computer simulation of the experimental spectrum and compared with those of other low-spin manganese(II) compounds with comparable types of chemical bonding.