Reorientation and vibrational energy relaxation of pseudohalide ions confined in reverse micelle water pools

Autor:	Q. Zhong, Jeffrey C. Owrutsky, Andrew P. Baronavski
Rok vydání:	2003
Předmět:	chemistry.chemical_compound Cyclohexane Chemistry Analytical chemistry Solvation Vibrational energy relaxation General Physics and Astronomy Molecule Infrared spectroscopy Physical and Theoretical Chemistry Micelle Order of magnitude Ion
Zdroj:	The Journal of Chemical Physics. 119:9171-9177
ISSN:	1089-7690 0021-9606
DOI:	10.1063/1.1614207
Popis:	Reorientation and vibrational energy relaxation times have been measured by ultrafast transient polarization IR spectroscopy for the antisymmetric stretching band in the 2000–2200 cm−1 region of pseudohalide ions, N3−, NCO−, and NCS−, confined in nanosize water pools of reverse micelles (RMs). The RMs are composed of nonionic nonylphenyl poly-oxyethylene surfactant in cyclohexane. Vibrational energy relaxation times (T1) of the NCO− and NCS− ions are about three times longer in small RMs compared to bulk water, similar to our earlier results on the N3− ion [J. Chem. Phys. 118, 7074 (2003)]. The longer T1 times are attributed to the reduced interaction between the ions and water molecules due to confinement effects and hydration of the surfactant headgroups by water molecules. Reorientation times (TR) of the N3− and NCS− ions are found to be more than one order of magnitude longer in small RMs than in bulk H2O. The observed longer TR times support the notion that water molecules inside RMs have very restri...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d7fcc72547ad544698a11e1274605040 https://doi.org/10.1063/1.1614207 Zobrazit plný text záznamu