Calcium-ion induced color changes of a porphyrin solution

Autor:	Hiroyasu Imai, Astuko Osada, Hiroki Munakata, Yoshio Uemori
Rok vydání:	2006
Předmět:	Denticity Metal ions in aqueous solution Photochemistry Porphyrin Spectral line Inorganic Chemistry Hydrophobic effect chemistry.chemical_compound chemistry Polymer chemistry Materials Chemistry Ethanesulfonic acid Titration Physical and Theoretical Chemistry Pyrrole
Zdroj:	Inorganica Chimica Acta. 359:4594-4600
ISSN:	0020-1693
DOI:	10.1016/j.ica.2006.07.060
Popis:	Interactions between the porphyrin-bearing multidentate ligands and group II metal ions in aqueous solution were studied. Changes in the visible spectra of 5 × 10−5 M solution of the porphyrin in 0.01 M 2-[4-(2-hydroxyethyl)-1-piperazinyl] ethanesulfonic acid (pH 7.4) containing 0.1 M KCl were observed upon titration of Ca2+ at 25 °C. From the analyses of NMR and visible spectral data, we proposed that the spectral changes are due to the formation of an associate between the porphyrin and Ca2+ via the following three interactions: (i) formation of a complex between the attached NTA groups and Ca2+; (ii) hydrophobic interaction among porphyrin rings; and (iii) interaction between the pyrrole nitrogens and Ca2+.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5442958357e2feffed58854826ec57e0 https://doi.org/10.1016/j.ica.2006.07.060 Zobrazit plný text záznamu Full Text from ScienceDirect