Photonics of benz [c, d] indole-based Polymethine Dyes molecules and singlet oxygen sensitization

Niyazbek Ibrayev; Gulnur Amanzholova; Amina Aymagambetova

doi:10.31489/2026N3/37-43

Authors

Niyazbek Ibrayev Doctor of Physico-Mathematical Sciences, Professor, Institute of Molecular Nanophotonics, Buketov Karaganda National Research University, Karaganda, Kazakhstan
Gulnur Amanzholova PhD, Senior Researcher, Institute of Molecular Nanophotonics, Buketov Karaganda National Research University, Karaganda, Kazakhstan
Amina Aymagambetova Master, Junior Researcher, Institute of Molecular Nanophotonics, Buketov Karaganda National Research University, Karaganda, Kazakhstan

DOI:

https://doi.org/10.31489/2026N3/37-43

Keywords:

benz[c, d]indole, polymethine dyes, intersystem crossing, triplet state, singlet oxygen, photodynamic therapy

Abstract

This study presents a comparative study of the photophysical properties of the basic polymethine dye bcd based on benz[c,d]indole and its modified derivative 2848SL. Replacing the phenyl groups (Ph) at the nitrogen atoms with butyl radicals (Bu), as well as introducing phenylmercapto groups (-SPh) into the 2848SL molecule, improves electron conjugation, resulting in a bathochromic shift of the absorption and fluorescence maxima to the near-IR region. This modification was found to increase the lifetime of the triplet state from 21.1 to 33.2 μs and leads to an increase of the quantum yield of singlet oxygen generation O2(1∆g) to 0.10. The obtained results confirm the effectiveness of triplet-triplet energy transfer, making the 2848SL derivative a promising agent for photodynamic therapy.

Author's detail

Niyazbek Ibrayev, Doctor of Physico-Mathematical Sciences, Professor, Institute of Molecular Nanophotonics, Buketov Karaganda National Research University, Karaganda, Kazakhstan

Ibrayev, Niyazbek - Doctor of Physico-Mathematical Sciences, Professor, Institute of Molecular Nanophotonics, Buketov Karaganda National Research University, Karaganda, Kazakhstan; SCOPUS Author ID: 9333698600; Web of Science Researcher ID: C-2957-2015; https://orcid.org/0000-0002-5156-5015; niazibrayev@mail.ru

Gulnur Amanzholova, PhD, Senior Researcher, Institute of Molecular Nanophotonics, Buketov Karaganda National Research University, Karaganda, Kazakhstan

Amanzholova, Gulnur - PhD, Senior Researcher, Institute of Molecular Nanophotonics, Buketov Karaganda National Research University, Karaganda, Kazakhstan; SCOPUS Author ID: 57204729767; Web of Science Researcher ID: U-6122-2018; https://orcid.org/0000-0002-0201-2692; gulnur_as@inbox.ru

Amina Aymagambetova, Master, Junior Researcher, Institute of Molecular Nanophotonics, Buketov Karaganda National Research University, Karaganda, Kazakhstan

Aymagambetova, Amina - Master, Junior Researcher, Institute of Molecular Nanophotonics, Buketov Karaganda National Research University, Karaganda, Kazakhstan; SCOPUS Author ID: 59365258300; https://orcid.org/0009-0002-2414-9005; fiz.tekh@mail.ru

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Photonics of benz [c, d] indole-based Polymethine Dyes molecules and singlet oxygen sensitization