메뉴 건너뛰기




Volumn 111, Issue 25, 2007, Pages 7291-7302

Solvation and rotational dynamics of coumarin 153 in ionic liquids: Comparisons to conventional solvents

Author keywords

[No Author keywords available]

Indexed keywords

ABSORPTION; ANISOTROPY; EMISSION SPECTROSCOPY; FREE ENERGY; SOLVATION; SOLVENTS;

EID: 34547347270     PISSN: 15206106     EISSN: None     Source Type: Journal    
DOI: 10.1021/jp070923h     Document Type: Article
Times cited : (297)

References (100)
  • 5
    • 0004145285 scopus 로고    scopus 로고
    • Wasserscheid, P, Welton, T, Eds, Wiley-VCH: Weinheim, Germany
    • Wasserscheid, P.; Welton, T., Eds. Ionic Liquids in Synthesis; Wiley-VCH: Weinheim, Germany, 2003.
    • (2003) Ionic Liquids in Synthesis
  • 44
    • 0344737750 scopus 로고    scopus 로고
    • Baker, S. N.; Baker, G. A.; Munson, C. A.; C., F.; Bukowski, E. J.; Cartwright, A. N.; Bright, F. V. Ind. Eng. Chem. Res. 2003, 42, 6457-6463.
    • Baker, S. N.; Baker, G. A.; Munson, C. A.; C., F.; Bukowski, E. J.; Cartwright, A. N.; Bright, F. V. Ind. Eng. Chem. Res. 2003, 42, 6457-6463.
  • 55
    • 84906388762 scopus 로고    scopus 로고
    • -] (to < 30 ppm water) and remeasured the solvation dynamics at 298 K. The results obtained with this drier sample were well within the experimental uncertainties of the earlier results.
    • -] (to < 30 ppm water) and remeasured the solvation dynamics at 298 K. The results obtained with this drier sample were well within the experimental uncertainties of the earlier results.
  • 61
    • 0347646736 scopus 로고    scopus 로고
    • Ionic Liquids: Industrial Applications for Green Chemistry
    • Rogers, R. D, Seddon, K. R, Eds, American Chemical Society: Washington, DC
    • Huddleston, J. G.; Broker, G.; Willauer, H.; Rogers, R. D. In Ionic Liquids: Industrial Applications for Green Chemistry; Rogers, R. D., Seddon, K. R., Eds.; ACS Symposium Series 818; American Chemical Society: Washington, DC, 2002; pp 270-288.
    • (2002) ACS Symposium Series , vol.818 , pp. 270-288
    • Huddleston, J.G.1    Broker, G.2    Willauer, H.3    Rogers, R.D.4
  • 71
    • 84906360536 scopus 로고    scopus 로고
    • It should be noted that Wu and Stark50 have reported a value of 69.9 ×.7 for [Im41, BF4, using a new method that they propose for measuring permittivities of conducting materials. This value differs greatly from the value of 11.7 of Weingärtner and co-workers,48 which we take to be more reliable
    • 48 which we take to be more reliable.
  • 74
    • 84906403466 scopus 로고    scopus 로고
    • rot) of the decays.
    • rot) of the decays.
  • 75
    • 84906360535 scopus 로고    scopus 로고
    • Allowing this parameter to vary in the fitting procedure typically yielded values between 0.36 and 0.38. However, in some cases allowing this parameter to vary led to significantly different values. For consistency we therefore fixed the value to 0.375, which was determined from the value in a glassy medium determined in ref 76.
    • Allowing this parameter to vary in the fitting procedure typically yielded values between 0.36 and 0.38. However, in some cases allowing this parameter to vary led to significantly different values. For consistency we therefore fixed the value to 0.375, which was determined from the value in a glassy medium determined in ref 76.
  • 82
    • 84906403464 scopus 로고    scopus 로고
    • Three direct comparisons can be made. In [Im41, PF6, at 298 K, Sarkar and co-workers reported C153 rotation times of 4.724 and 3.57 ns22 r0 ≈ 0.25, much shorter times than the 12 ± 2 ns measured here. The reason for this large difference is unclear. Funston et al. 29 measured temperature-dependent rotation times of C153 in [N 4441, Tf2N, and [Pr 41, Tf2N, Interpolating their data to 298 K provides values of 28 ns in both cases. Our value of 51 ± 25 ns in [N4441, Tf2N, at 298 K is poorly defined but in general agreement with their more accurate determination. In [Pr41, Tf2N, we measure 3.4 ± 0.5 ns, which is quite far from their correlation time of 28 ns. However, their large correlation ti
    • -] we measure 3.4 ± 0.5 ns, which is quite far from their correlation time of 28 ns. However, their large correlation time reflects the presence of a ∼200 ns component whose reality is presently uncertain and that would be impossible to detect in our experiments. If this component is neglected, then their time reduces to 3.8 ns, in agreement with our value.
  • 90
    • 84906403465 scopus 로고    scopus 로고
    • 43 have made a similar comparison in a fourth ionic liquid with apparently more satisfactory agreement between experiment and dielectric continuum calculations. However, their calculations ignore the missing fast components of ε(ω). Although the dielectric measurements that they employ extend to 90 GHz, even here when unobserved components in ε(ω) are accounted for in the approximate manner described in ref 38, the level of agreement between the calculated and observed solvation response is significantly degraded.
    • 43 have made a similar comparison in a fourth ionic liquid with apparently more satisfactory agreement between experiment and dielectric continuum calculations. However, their calculations ignore the missing fast components of ε(ω). Although the dielectric measurements that they employ extend to 90 GHz, even here when unobserved components in ε(ω) are accounted for in the approximate manner described in ref 38, the level of agreement between the calculated and observed solvation response is significantly degraded.
  • 91
    • 84906388760 scopus 로고    scopus 로고
    • 3.
    • 3.
  • 95
    • 84906360534 scopus 로고    scopus 로고
    • On the basis of observing anomalously small activation energies for rotation of an electron spin resonance probe Evans et al.99 suggested that such a bilayer structure exists in [P14,666, Tf2N, and a related P14,666+ ionic liquid. The simple volumetric behavior observed of [P14,666, Tf2N, and other P14,666, liquids100 would seem to argue against anything so highly organized. It could be that the unusual behavior observed by Evans et al.99 might result from the reorientation being highly nonexponential in these liquids, which could invalidate the line shape analysis used
    • 99 might result from the reorientation being highly nonexponential in these liquids, which could invalidate the line shape analysis used.
  • 98
    • 84906388758 scopus 로고    scopus 로고
    • 29 as a function of viscosity show roughly the same amount of scatter as the majority grouping of solvents in Figure 10. The only clear deviation occurs for the two highest viscosity points (η > 3000 cP) where the times that they report (∼10 ns) are roughly a factor of 3 faster than expected.
    • 29 as a function of viscosity show roughly the same amount of scatter as the majority grouping of solvents in Figure 10. The only clear deviation occurs for the two highest viscosity points (η > 3000 cP) where the times that they report (∼10 ns) are roughly a factor of 3 faster than expected.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.