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Zeitschrift für Physikalische Chemie

International journal of research in physical chemistry and chemical physics

Ed. by Rademann, Klaus

12 Issues per year

IMPACT FACTOR 2016: 1.012

CiteScore 2016: 0.99

SCImago Journal Rank (SJR) 2016: 0.463
Source Normalized Impact per Paper (SNIP) 2016: 0.470

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Volume 221, Issue 4 (Apr 2007)


Solvation-Shell Effect on the Cyanine-Dye Fluorescence in Binary Liquid Mixtures

N. Kh. Petrov / M. N. Gulakov / M. V. Alfimov / G. Busse / S. Techert
Published Online: 2009-09-25 | DOI: https://doi.org/10.1524/zpch.2007.221.4.537

The steady-state fluorescence anisotropy and the relative quantum yield of fluorescence of cyanine dyes, 3,3′-diethyl-thiacarbocyanine iodide (DTCI) and chloride (DTCC), were measured in toluene/dimethyl sulfoxide (DMSO) liquid mixtures. It has been found that in toluene-rich mixtures the fluorescence quantum yield of DTCC is larger by about one order of magnitude than that of DTCI, the fluorescence quantum yields being the same for both cyanines in neat DMSO. Estimations based on the Perrin formula show that on decreasing DMSO volume fraction (less than 20 vol.%) the size of the preferential solvation shell around the DTCI increases up to 23 DMSO molecules at 3 vol.% DMSO as the solvation shell of DTCC does not vary. The influence of nearby solvent environment on the cyanine dye photophysics can be explained in terms of the Onsager model by taking into account the effect of the dynamic properties of DMSO solvation shell on the dye fluorescent rate constant.

Keywords: Photophysics; Cyanine Dyes; Binary Mixtures; Nanoclusters; Preferred Orientation

About the article

Received: 2007-01-18

Accepted: 2007-01-29

Published Online: 2009-09-25

Published in Print: 2007-04-01

Citation Information: Zeitschrift für Physikalische Chemie, ISSN (Online) 2196-7156, ISSN (Print) 0942-9352, DOI: https://doi.org/10.1524/zpch.2007.221.4.537.

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