The hydrolysis of antimony(III) ions was investigated through solvent extraction with dithizone–carbon tetrachloride solutions. In a 3 M (H, Na)ClO4 solution, a tracer concentration of antimony(III) (<10−8M) was found in the form of a monovalent cation, Sb(OH)2+ or SbO+, and a neutral species, Sb(OH)3 or SbO(OH). The former is predominant in strongly acidic media, while the latter becomes abundant in the weakly acidicto-neutral region. One of the constants of successive hydrolysis, K1=[Sb(OH)2+][Sb(OH)3]−1[H+]]−1, was calculated from the distribution ratios, giving the result: logK1=1.236±0.06. The chemical composition of the extracted species was estimated to be Sb(HDz)3.

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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)]IM'(TPPS)] (M,M'=Cu, Zn). The predominant factor for the difference of the recoil feature is discussed. (H2TMPyP: tetrakis(4-Nmethylpyridyl)-porphine, H2TCPP: tetra(p-carboxyphenyl)porphine, H2TPPS: tetra(p-sulfophenyl)-porphine).

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