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<p>This paper reports the investigations to explore mechanisms of nonradiative electron transfer (ET) processes involved within donor (amino part) and acceptorfluorene of an organic short-chain dyad (E)-4-(((9H-fluorene-2yl)imino)-methyl)-N,N-dimethylaniline(NNDMBF). Furthermore,this study explores a novel aspect where Graphene Quantum Dots (GQDs) act as electron acceptors, facilitating additional electron transfer (ET) reactions within the nanocomposite system involving the donor part of the dyad and GQDs. The combined ET reaction provides valuable insight into enhancing charge separation and stability in such systems. This investigation utilizes a comprehensive array of spectroscopic techniques, including steady-state and time-resolved, alongside femtosecond (fs) transient absorption spectroscopic studies conducted across various delay times on the pristine as well as nanocomposite systems comprising (NNDMBF) the short-chain dyad and graphene quantum dots (GQDs).Since due to significant signal reduction of transient absorption species of the dyad nanocomposite systems no conclusive evidences on the formation of charge –separated species could be made possible, we have to focus our attention to the results observed from time resolved fluorescence studies. Comparing the outcomes with the pristine dyad, the results unveil a compelling narrative. The nanocomposite system appears to be a better light energy converter in comparison to pristine dyad, owing to its enhanced capacity to retain excited trans-configurations of elongated nature. This provides a significant advancement in our study on the ET mechanisms of the dyad-GQD system.</p>

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A dual electron transfer pathway: the impact of graphene quantum dots on photophysics of a short-chain organic dyad system

  • 期刊论文

  • 发表日期：

    2026年4月6日

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  • Ishani Mitra,
  • Soumi Mondal,
  • Madhurima Chakraborty,
  • Toushif Alam,
  • Tapan Ganguly

摘要

This paper reports the investigations to explore mechanisms of nonradiative electron transfer (ET) processes involved within donor (amino part) and acceptorfluorene of an organic short-chain dyad (E)-4-(((9H-fluorene-2yl)imino)-methyl)-N,N-dimethylaniline(NNDMBF). Furthermore,this study explores a novel aspect where Graphene Quantum Dots (GQDs) act as electron acceptors, facilitating additional electron transfer (ET) reactions within the nanocomposite system involving the donor part of the dyad and GQDs. The combined ET reaction provides valuable insight into enhancing charge separation and stability in such systems. This investigation utilizes a comprehensive array of spectroscopic techniques, including steady-state and time-resolved, alongside femtosecond (fs) transient absorption spectroscopic studies conducted across various delay times on the pristine as well as nanocomposite systems comprising (NNDMBF) the short-chain dyad and graphene quantum dots (GQDs).Since due to significant signal reduction of transient absorption species of the dyad nanocomposite systems no conclusive evidences on the formation of charge –separated species could be made possible, we have to focus our attention to the results observed from time resolved fluorescence studies. Comparing the outcomes with the pristine dyad, the results unveil a compelling narrative. The nanocomposite system appears to be a better light energy converter in comparison to pristine dyad, owing to its enhanced capacity to retain excited trans-configurations of elongated nature. This provides a significant advancement in our study on the ET mechanisms of the dyad-GQD system.