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      https://www.ias.ac.in/article/fulltext/jcsc/130/10/0134

    • Keywords

       

      Cyclodextrins; donor–acceptor systems; inclusion binding; PET; supramolecular assembly.

    • Abstract

       

      Equimolar amounts of native β-cyclodextrin (β-CD), pyrene-linked adamantane (PYAD) and tert-butylpyromellitic diimide (PMDI) when dissolved in water self-assembled to form the supramolecular donor-acceptor system PYAD⊐β-CD>PMDI. The high affinity of adamantane derivatives for inclusion bindingin the β-CD cavity and the propensity of PMDI to undergo rim-binding at the narrow rim of β-CD led to the formation of PYAD⊐β-CD>PMDI. The ternary complex PYAD⊐β-CD>PMDI was thoroughly characterized using various spectroscopic techniques. β-CD performs three functions in the self-assembled complex: (1) encapsulate the adamantane unit and keep the pyrene (PY) moiety above the secondary rim, (2) rim-bind PMDI and keep it at the primary rim, and (3) act as a spacer between pyrene and PMDI. Thus, the ternary complex canfunction as a donor-spacer-acceptor system capable of undergoing photoinduced electron transfer (PET). Upon excitation of the pyrene moiety in PYAD⊐β-CD>PMDI an electron is transferred from the excited pyrene tothe PMDI ground state. Steady state and time resolved fluorescence experiments were carried out to study the PET in PYAD⊐β-CD>PMDI. Existence of the ternary system and PET processes taking place within it are further supported by laser flash photolysis experiments.

    • Author Affiliations

       

      RETHEESH KRISHNAN1 2 SUMESH BABU KRISHNAN1 3 BIJITHA BALAN1 4 KARICAL RAMAN GOPIDAS1 3

      1. Photosciences and Photonics, Chemical Sciences and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology, Council of Scientific and Industrial Research, Thiruvananthapuram 695 019, Kerala, India
      2. Department of Chemistry, Government College for Women, Thiruvananthapuram 695 014, Kerala, India
      3. Academy of Scientific and Innovative Research (AcSIR), New Delhi 110 001, India
      4. Department of Chemistry, Government College Kariavattom, Thiruvananthapuram 695 581, Kerala, India
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