AGGREGATION AND COUNTER ION BINDING OF PENTYL AND HEXYL ORANGE IN AQUEOUS SOLUTIONS

Autor:	Masaru Mitsuishi, Takako Izumi, Ikuko Hirose, Tohru Takagishi, Toshiyuki Yagi, Tsutomu Ishiwatari, Nobuhiko Kuroki
Rok vydání:	1984
Předmět:	chemistry.chemical_classification Activity coefficient Aqueous solution Chemistry Sodium Inorganic chemistry chemistry.chemical_element Molecule General Medicine Orange (colour) Counterion Ion
Zdroj:	Sen'i Gakkaishi. 40:T37-T43
ISSN:	1884-2259 0037-9875
DOI:	10.2115/fiber.40.t37
Popis:	The mean activity coefficients of sodium 4′-dipentylaminoazobenzene-4-sulfonate (pentyl orange, PeO) and sodium 4′-dihexylaminoazobenzene-4-sulfonate (hexyl orange, HeO) in aqueous solutions having the concentrations from 10-3 to 10-2 mol kg-1 have been determined by means of isopiestic measurements at 60°C. It has been found that the coefficient of HeO is much smaller than that of PeO, both being much smaller than unity. The coefficients are strongly influenced by the hydrophobic groups in the dye molecules. On the basis of spectrophotometric and conductometric studies, it has been concluded that PeO and HeO exist in the aggregates with their counter ions, Na+, being bound, in aqueous solution at a temperature as high as 60°C.
Databáze:	OpenAIRE
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