
- P-ISSN 1225-0163
- E-ISSN 2288-8985
A cationic water soluble porphyrin (5,10,15,20-tetrakis (l-methyl-pyridinium-4-yl)porphyrin, <TEX>$H_2tmpyp^{4+}$</TEX>) and its metalloporphyrins (MP) were easily extracted into acetonitrile separated by addition of sodium chloride (<TEX>$4mol\;dm^{-3}$</TEX>) in the presence of sodium perchlorate, where M denotes <TEX>$Zn^{2+}$</TEX>, <TEX>$Cu^{2+}$</TEX>, <TEX>$Co^{3+}$</TEX>, <TEX>$Fe^{3+}$</TEX>, and <TEX>$Mn^{3+}$</TEX> and <TEX>$P^{2-}$</TEX> is porphyrinate ion. The extracted ion-pair complexes were completely dissociated to <TEX>$[MP(ClO_4)_3]^+$</TEX>, and <TEX>$[MP(ClO_4)_2]^{2+}$</TEX>. The extraction and the dissociation constants were determined by taking into account of the partition constant of sodium perchlorate (<TEX>$K_D