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Temperature-dependent Time-resolved Fluorescence Study of Cinchonine Alkaloid Dication

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Abstract

Photo induced excited state dynamical processes of cinchonine alkaloid dication (C++) have been studied over a wide range of temperature using steady state and nanosecond time-resolved fluorescence spectroscopic techniques. The temperature-dependent fluorescence studies of C++ clearly indicate the existence of two distinct emitting species having their own characteristic decay rates. The shorter-lived species shows a usual temperature dependence with increasing non-radiative deactivation at higher temperatures, while the longer-lived species show features resembling to the excited state solvent relaxation process with a large solvent relaxation time (τ r ∼ 6 ns). The species emitting in the lower energy side, having longer decay time is found to be more sensitive towards chloride ion quenching and has a charge transfer character. Further, concentration quenching with decrease in τ r of long lived species shows the possibility of energy migration along with solvent relaxation in C++.

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Acknowledgment

One of the authors (HM) is thankful to CSIR and DST, New Delhi, India for the financial assistance. Dr. Supriya Tilvi, MBU, IISc, Bangalore is acknowledged for the critical reading of the manuscript. The authors are thankful to DST and CSIR, New Delhi, India for the financial assistance. The authors are also thankful to the reviewers for their helpful comments.

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Authors and Affiliations

  1. Molecular Biophysics Unit, Indian Institute of Science, Bangalore, 560012, India

    Hirdyesh Mishra

  2. Photophysics Laboratory, Department of Physics, Kumaun University, Nainital, 263001, India

    Hirdyesh Mishra, Sanjay Pant & Hera B. Tripathi

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  1. Hirdyesh Mishra
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  2. Sanjay Pant
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  3. Hera B. Tripathi
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Correspondence to Hirdyesh Mishra.

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Mishra, H., Pant, S. & Tripathi, H.B. Temperature-dependent Time-resolved Fluorescence Study of Cinchonine Alkaloid Dication. J Fluoresc 18, 17–27 (2008). https://doi.org/10.1007/s10895-007-0229-6

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  • DOI: https://doi.org/10.1007/s10895-007-0229-6

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