کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1233529 968811 2011 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Photophysics of representative ketocyanine dyes: Dependence on molecular structure
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Photophysics of representative ketocyanine dyes: Dependence on molecular structure
چکیده انگلیسی

Spectral properties of a new fluorescent ketocyanine dye have been discussed. The energy of maximum absorption/fluorescence of the dye exhibits bathochromic shift with increasing polarity of the medium. Both dipolarity–polarisability and hydrogen bond donation interaction contribute to solvation of the dye. Study of fluorescence parameters points to existence of different emitting states of the dye for aprotic and protic solvents. While the emitting state is the 1(π, π*) state for aprotic solvents, fluorescence supposedly take place from a different emitting state involving H-bond formation in the excited state in protic solvents. Fluorescence parameters of the dye have been compared with those for a structurally similar symmetric ketocyanine dye. The faster decay of the dye relative to its symmetric counterpart has been explained as due to an increase of nonradiative decay.

Variation of decay constant by non-radiative process of a ketocyanine dye as a function of solvent polarity.Figure optionsDownload as PowerPoint slideHighlights
► Optical response of a new ketocyanine dye has been studied in various media.
► Photophysics of the dye in protic media differs from that in aprotic media.
► S1 state for the dye decays at a faster rate than the corresponding symmetric dye.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy - Volume 81, Issue 1, 15 October 2011, Pages 79–84
نویسندگان
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