Analytical Sciences
Online ISSN : 1348-2246
Print ISSN : 0910-6340
ISSN-L : 0910-6340
Ion-Pair Extraction of Lithium Ion by a Water-Soluble Porphyrin
Sun HAIPINGJun NISHIMOTOMasaaki TABATA
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1997 Volume 13 Issue Supplement Pages 119-122

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Abstract
The equilibrium of ion-pair extraction of lithium porphyrin [octabromoporphyrin: 2, 3, 7, 8, 12, 13, 17, 18-octabromo-5, 10, 15, 20-tetrakis(4-sulfonatophenyl)porphyrin, Hobtpps4-; HP4-] with tetrabutylammonium ion (X) was studied at 25°C and I=0.1 (NaCl, NaOH). Extraction and dissociation constants of the ion-pair complexes of free base porphyrin, deprotonated porphyrin and lithium porphyrin, defined as Kex(Hp)=[XHP]/[HP4-][X], Kex(HP)=[XHP]/[HP5+][X], K"ex(Lip)=[XLiP]/[LiP5-][X], Kdisl(HP)=[XHP][X][XHP] and K"disl(Lip)=[XLiP][X]/[XLiP], were determined. These values were found to be Kex(HP)=(9.5±1.5)×1013 (mol-4dm12), Kdisl(H2P)=(3.5± 0.7)×10-7 (mol dm-3), Kex(HP)=(4.7±0.4)×1016 (mol-5dm15) and K"ex(LiP)K"disl(Lip)=(8.4±0.7)×1012 (mol-4dm12), respectively.
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© The Japan Society for Analytical Chemistry
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