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      https://www.ias.ac.in/article/fulltext/jcsc/119/02/0175-0183

    • Keywords

       

      Photoinduced electron transfer; exciplex; fluorescence; naphthalene-aza-crown ethers; napthocrown ethers; fluorescence lifetimes.

    • Abstract

       

      A comparative time-resolved emission studies of several naphtho-crown ethers I-V, where metal ions can be complexed in a predetermined orientation with respect to the naphthalene (Naph) 𝜋- plane and naphthalene-linked aza crown ethers (L1 and L2) have been presented. In both the systems, crown ethers and aza crown ethers, naphthalene fluorescence gets quenched. In the systems I to V, the quenching is mainly due to efficient spin-orbit coupling (SOC) leading to greater population of the lowest triplet state of naphthalene. This SOC depends on the orientation of the crown ring with respect to the Naph-𝜋-plane. However, in the systems L1 and L2, the quenching is due to photoinduced electron transfer (PET) from nitrogen lone pair of the aza crown ring to naphthalene moiety and consequent exciplex formation. The results have been interpreted using the time-resolved emission studies of all the compounds in various solvents, their alkali metal ion complexes, and protonated ligands.

    • Author Affiliations

       

      Subhodip Samanta1 Pinki Saha Sardar1 Shyam Sundar Maity1 Anirban Pal1 Maitrayee Basu Roy1 Sanjib Ghosh1

      1. Department of Chemistry, Presidency College, Kolkata 700 073
    • Dates

       
  • Journal of Chemical Sciences | News

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