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The manganese(r1) 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 manganese(I1) 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(I1) compounds with comparable types of chemical bonding.

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