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Unusual Excited State Characteristics of 6-aminobenzothiazole with β-cyclodextrin

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Abstract

The interaction between 6-aminobenzothiazole (6ABT) and β-cyclodextrin (β-CDx) has been investigated in solution and solid state. The stoichiometry and binding constants of the complex between 6ABT and β-CDx in solution have been determined by steady state and time-resolved fluorescence spectroscopy. Fluorescence intensity of neutral form decreases during complexation which is contrary to the usual observation. This is explained by hydrogen bonding interaction between lone pair of nitrogen with OH groups of β-CDx. The FT-IR spectral study and SEM images of solid complex confirmed the formation of inclusion complex. Excited state acidity constants for 6ABT have been determined in aqueous and β-CDx medium and discussed.

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Acknowledgement

We are grateful thank to The National Centre for Ultrafast Processes (NCUFP), University of Madras, Chennai, for fluorescence lifetime measurements.

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Authors and Affiliations

  1. Department of Chemistry, SKP Institute of Technology, Tiruvannamalai, 606 611, India

    Rajamohan Rajaram

  2. Department of Chemistry, Annamalai University, Annamalainagar, 608 002, India

    Swaminathan Meenakshisundaram

  3. Chemistry Section, FEAT, Annamalai University, Annamalainagar, 608 002, India

    Kothai Nayaki Sundararajalu

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  1. Rajamohan Rajaram
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  2. Kothai Nayaki Sundararajalu
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  3. Swaminathan Meenakshisundaram
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Correspondence to Swaminathan Meenakshisundaram.

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Rajaram, R., Sundararajalu, K.N. & Meenakshisundaram, S. Unusual Excited State Characteristics of 6-aminobenzothiazole with β-cyclodextrin. J Fluoresc 21, 521–529 (2011). https://doi.org/10.1007/s10895-010-0738-6

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  • DOI: https://doi.org/10.1007/s10895-010-0738-6

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