Electron spin resonance, electron spin echo, and electron nuclear double resonance studies of the photoreduction yield of a series of alkylmethylviologens in sodium dodecyl sulfate and dodecyltrimethylammonium chloride micelles: Effect of the alkyl chain length of the viologen
Journal Article
·
· Journal of Physical Chemistry
- Univ. of Houston, TX (United States)
An electron spin resonance (ESR), electron spin echo (ESR), and proton matrix electron nuclear double resonance (ENDOR) study was carried out on a series of photoreduced alkylmethylviologens solubilized in frozen sodium dodecyl sulfate (SDS) and dodecyltrimethylammonium chloride (DTAC) micelles. Photoreduction yields were measured with ESR, while ESE and ENDOR were used to probe the location of the viologen cation with respect to the polar and nonpolar phases of the micellar suspensions. The ESE and ENDOR results show that the location of the viologen moiety within a DTAC micelle is determined by the length of the pendent alkyl chain. In SDS micelles, the ESE and ENDOR results indicate that the viologen cation radical appears to be bound to the anionic surface of the micelle. The ENDOR data show that SDS micelles have a more ordered interface compared to DTAC micelles. A secondary alkyl radical observed in DTAC is formed by radical conversion from the photoreduced alkylmethylviologen. The location of this alkyl radical was probed using ESE and proton matrix ENDOR spectroscopy, and the data support a micelle model with negligible water penetration into the hydrocarbon interior. 62 refs., 8 figs., 2 tabs.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 457822
- Journal Information:
- Journal of Physical Chemistry, Journal Name: Journal of Physical Chemistry Journal Issue: 13 Vol. 96; ISSN JPCHAX; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
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