Fluorescent Probe Solubilization in the Headgroup and Core Regions of Micelles: Fluorescence Lifetime and Orientational Relaxation Measurements | Zendy

Stephan Matzinger | Zendy; Deborah M. Hussey | Zendy; M. D. Fayer | Zendy

Open Access

Fluorescent Probe Solubilization in the Headgroup and Core Regions of Micelles: Fluorescence Lifetime and Orientational Relaxation Measurements

Author(s) -

Stephan Matzinger,

Deborah M. Hussey,

M. D. Fayer

Publication year - 1998

Publication title -

the journal of physical chemistry b

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.864

H-Index - 392

eISSN - 1520-6106

pISSN - 1520-5207

DOI - 10.1021/jp981860t

Subject(s) - chromophore , micelle , chemistry , fluorescence , relaxation (psychology) , fluorescence anisotropy , population , photochemistry , bromide , counterion , analytical chemistry (journal) , chemical physics , aqueous solution , inorganic chemistry , organic chemistry , ion , optics , membrane , psychology , social psychology , physics , demography , sociology , biochemistry

Experimental results demonstrate that the fluorescent probes 2-(N-hexadecylamino)-naphthalene-6-sulfonate (HANS) and 2-(N-decylamino)-naphthalene-6-sulfonate (DANS) are solubilized in two distinct regions, that is, the headgroup and core, within micelles of cetyltrimethylammoniumbromide (CTAB), tetradecyltrimethylammoniumbromide (TTAB), dodecyltrimethylammoniumbromide (DTAB), cetyltrimethylammoniumchloride (CTAC), and tetradecyltrimethylammoniumchloride (TTAC). The fluorescence lifetime decays for both chromophores are biexponential in all the different micelles. The population associated with the shorter lifetime (τ1 ≅ 4−5 ns) is located in the Stern layer, where reduction of the fluorescence lifetime occurs because of quenching induced by the bromide counterions. The second population of chromophores is located in the hydrocarbon core region of the micelle. In this environment the chromophores have a considerably longer lifetime (τ2 ≅ 19−20 ns) because there is no significant quenching by bromide counte...

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