Correlation of some recoil features in the water-soluble metalloporphyrin ion associate solid system with structural factors

The recoil feature of central metal atoms in the bi-component solid system of water-soluble metalloporphyrin ion associates was investigated in bremsstrahlung and thermal neutron irradiation at very low temperatures. Very preferable substitution of stable Zn central metal atoms by the Cu* recoil was observed in the system of [M(TMPyP)][M'(TCPP)] (M,M' = Cu, Zn) in both irradiations, while no such tendency was seen in the system of [M(TMPyP)][M'(TPPS)] (M,M' = Cu, Zn). The predominant factor for the difference of the recoil feature is discussed. (H2TMPyP: tetrakis(4-N-methylpyridyl)-porphine, H2TCPP: tetra(p-carboxyphenyl)porphine, H2TPPS: tetra(p-sulfophenyl)-porphine). (author)