Electron spin resonance and electron spin echo modulation studies on photoinduced charge separation from N-alkylphenothiazines in sodium dodecyl sulfate micelles: Effect of {alpha}- and {beta}-cyclodextrin addition
- Pukyong National Univ., Pusan (Korea, Republic of)
- Univ. of Houston, TX (United States)
Photoinduced electron transfer from N-alkylphenothiazines (PC{sub n}, n = 3, 9, 12, 16) to D{sub 2}O at a micellar interface was monitored versus the alkyl chain length of PC{sub n} and versus cyclodextrin (CD) addition into the micelle by determining the photoproduced radical yield by electron spin resonance. The photoyield of PC{sub n} in sodium dodecyl sulfate micelles monotonically decreases with increasing concentration of {alpha}-CD. This results from an increased electron transfer distance between the phenothiazine moiety and interface D{sub 2}O by replacing some interface D{sub 2}O with {alpha}-CD. Addition of {beta}-CD shows a different trend for the photoyield. The photoyield increases with increasing concentration of {beta}-CD up to 10 mM and thereafter monotonically decreases. The increased photoyields up to 10 mM {beta}-CD result from a decreased interaction distance between the phenothiazine moiety and D{sub 2}O at the micellar interface by intercalation of {beta}-CD between the headgroups of the surfactant molecules. The decrease of photoyield above 10 mM {beta}-CD results from an initial increased interaction distance between the phenothiazine moiety and interface water by replacing some D{sub 2}O at the micellar interface to 15 mM {beta}-CD and thereafter disrupting the micellar structure by the high concentration of {beta}-CD. 49 refs., 9 figs.
- OSTI ID:
- 501919
- Journal Information:
- Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical, Journal Name: Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical Journal Issue: 4 Vol. 101; ISSN 1089-5647; ISSN JPCBFK
- Country of Publication:
- United States
- Language:
- English
Similar Records
Electron magnetic resonance studies on the photoionization of n-alkylphenothiazines in micellar solutions: Effect of urea on the radical photoyield
Comparative electron spin resonance and electron spin echo modulation studies of the photoionization of positively and negatively charged and neutral alkylphenothiazines in cationic dioctadecyldimethylammonium chloride, neutral dipalmitoylphosphatidylcholine, and anionic dihexadecyl phosphate vesicles at 77K