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Solvent-dependent changes in molecular reorientation dynamics: the role of solvent-solvent interactions


Reference:

Hay, C. E., Marken, F. and Blanchard, G. J., 2010. Solvent-dependent changes in molecular reorientation dynamics: the role of solvent-solvent interactions. The Journal of Physical Chemistry A, 114 (14), pp. 4957-4962.

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Official URL:

http://dx.doi.org/10.1021/jp912217r

Abstract

We report on the rotational diffusion dynamics of two different chromophores, resorufin and 6-(N-(7-nitrobenz-2-oxa-1,3-diazol-4-yl)amino)hexanoic acid (NBDHA) in water and N-octyl-2-pyrrolidone (NOP) solvents. We measure the induced orientational anisotropy function, R(t), using time-correlated single photon counting. Our data show that both chromophores exhibit single exponential anisotropy decays in aqueous solution and two-component exponential anisotropy decays in NOP. The change of the anisotropy decay functionality indicates that the effective rotor shape swept out by solute rotational motion is different in the two solvents. We interpret these findings in the context of Chuang and Eisenthal's theory of fluorescence depolarization by rotational diffusion. The similarity in the behavior of the two different chromophores in these solvent systems points to solvent-solvent interactions and local organization as the dominant factors in mediating motional dynamics.

Details

Item Type Articles
CreatorsHay, C. E., Marken, F. and Blanchard, G. J.
DOI10.1021/jp912217r
DepartmentsFaculty of Science > Chemistry
RefereedYes
StatusPublished
ID Code18672

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