Spectroscopic Study on Functional Micelis Provided by Anthracene- and Benzophenone-labeled Surfactants

Abstract

As a basis of molecular: aggregate:: electron transport-sensitizers, micelle structure was spe-ctroscopically studied by using following surfactants containing anthryl or benzoylphenyl group. These were sodium 10-dodecy1-9-anthrylraethanestrifenate-(SDAS), (p-benzoylbenzyl)-triethyl-ammonium bromide (BBTEABr), (p-benzoylbenzyl) dodecyldimethylammonium bromide (BBDD-ABr), sodium 10-(4-behigylphenoxy)-decane-1-sulfonate (BPDSNa) 'sodium, 6(4-benzoylphen-oxy) -1-hexane' sulfpnate (BPHSNa), and [10-(4-bermoylplienoxy)deol]oimetylammonium bromide (BPDTABr). Even below CMC; the anthryl groups..isi SDAS aggregated to form a stable dimer-like structure (Figs, 3, 6(a), and Tablel 1). Above, CMC, however, aggregation of anthryl groups became Iooser ; that was expected to result in a favorable micelle structure to mimic therole of antena pigmeritsby promoting energy migration amOng_.anthril groups. The measurements of π-π* and n-π* transitions of benzoylphenyl groups (Fig.7 and Table 4) indicated-that :lienzpylphenyL grpups were located in the polar boundary layer of the micelles regardless of the structure of surfactants. The structures of the micelles containing benzoyl-phenyl or anthryl group were schematically shown (Figs. 8, 9) based on spectroscopic inf or-mation.