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Effect of viscosity on the singlet-excited state dynamics of some hemicyanine dyes

Publication Type : Journal Article

Publisher : Research on Chemical Intermediates

Source : Research on Chemical Intermediates, Volume 29, Number 3, p.293–305 (2003)

Url : http://dx.doi.org/10.1163/156856703764929958

Campus : Amritapuri

School : School of Arts and Sciences

Department : Chemistry

Year : 2003

Abstract : Photophysical properties of hemicyanine dyes (1 - 3) were investigated in solvents of varying polarity and viscosity. Hemicyanines possess relatively low fluorescence quantum yields (≤1{%}) in polar solvents. A significant increase in fluorescence quantum yield and lifetimes was observed with increase in viscosity of the solvent medium. The radiative, as well as nonradiative decay channels from the singlet-excited state were investigated by varying the viscosity of the medium. The viscosity-dependent radiationless relaxation observed in hemicyanine dyes is suggestive of a restricted rotor motion in the singlet excited state.

Cite this Research Publication : Dr. Zeena S. Pillai, P. K. Sudeep, and K. George Thomas, “Effect of viscosity on the singlet-excited state dynamics of some hemicyanine dyes”, Research on Chemical Intermediates, vol. 29, pp. 293–305, 2003

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