G. Krishnamoothy et Sk. Dogra, Effect of micelles on the prototropic equilibrium of 2-(4 '-N,N-dimethylaminophenyl)pyrido[3,4-d]imidazole, PHYS CHEM P, 2(11), 2000, pp. 2521-2528
The spectral characteristics of 2-(4'-N,N-dimethylaminophenyl)pyrido[3,4-d]
imidazole (DMAPPI) were studied in sodium docecyl sulfate (SDS), cetyltrime
thylammonium bromide (CTAB) and Triton X-100 (TX-100) micelles at various a
cid concentrations. Of the three kinds of monocations (MC1, MC2 and MC3) in
DMAPPI, MC1 and MC3 are present in the S-0 state but MC2 and MC3 are prese
nt in the S-1 state in SDS. MC2 in SDS, similarly to that in aqueous medium
, is formed by biprotonic phototautomerism. In CTAB and TX-100, whereas MC1
and MC2 are present in the aqueous and micellar phase, respectively, MC3 i
s distributed between both the micellar and aqueous phase in the S-0 state,
but only MC2 and MC3 are present in both phases in the S-1 state. MC3 indu
ces micellization of SDS whereas none of the monocation induces micellizati
on of CTAB or TX-100.