Pyrene bichromophores composed of polyaminopolycarboxylate interlink: pH response of excimer emission

Autor:	Iliana C. Muñoz, Lorena Machi, Mario Sánchez, Motomichi Inoue, Refugio Pérez-González
Rok vydání:	2009
Předmět:	chemistry.chemical_compound Deprotonation Chemistry Amide Pyrene Protonation Density functional theory General Chemistry Excimer Photochemistry Fluorescence Dissociation (chemistry)
Zdroj:	Supramolecular Chemistry. 21:665-673
ISSN:	1029-0478 1061-0278
Popis:	Fluorescent response to pH has been studied on water-soluble pyrene-based bichromophores, (edtapy)H2 and (dtpapy)H3, in which two pyrenyl groups are linked by an ethylenediaminetetraacetate (EDTA) and a diethylenetriaminepentaacetate (DTPA) unit, respectively, through amide linkages. The excimer emission of the EDTA derivative is strengthened sharply with increasing pH at two steps; the first step is associated with the dissociation of acidic hydrogen from amino nitrogen in partially protonated species (edtapy)H− and the second step is attributable to the amide group. The excitation spectra have evidenced the formation of a static excimer in the ground state of completely deprotonated species (edtapy)2 − . The close contact between pyrenyl groups in (edtapy)2 − has been confirmed by density functional theory, which has also shown that the close contact is broken when amino nitrogen is protonated. The DTPA derivative exhibits a strong excimer emission, which shows an intensity–pH profile of an ‘off–on–of...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::fb00f48457dfae279e9bca7760c20861 https://doi.org/10.1080/10610270802709360 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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