Anisotropic rotational behaviour of quinizarin in solution

Palit, D. K. ; Pal, H. ; Mukherjee, T. ; Mittal, J. P. (1988) Anisotropic rotational behaviour of quinizarin in solution Chemical Physics, 126 (2-3). pp. 441-452. ISSN 0301-0104

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Steady state polarised absorption spectra of quinizarin embedded in stretched polyethylene film and the fluorescence polarisation studies in glycerol indicate that 248, 320 and 470 nm absorption bands are long-axis polarised while that at 280 nm is short-axis polarised. The decay of the emission anisotropy of quinizarin in glycerol, over the temperature range of 15 to 40° C, could be analysed as a double exponential function for all the excitation wavelengths. The calculated rotational correlation times were independent of excitation wavelength, but were dependent on temperature, whereas, the pre-exponential terms were independent of temperature but dependent on the excitation wavelength, as expected from geometrical considerations. The rotational dynamics suggest that the quinizarin molecule rotates as a disk with the slipping boundary conditions and the ratio of the diffusion coefficients about the axes perpendicular and parallel to the plane of the disk is 10 ± 1.

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ID Code:25700
Deposited On:04 Dec 2010 11:52
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