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Spectroscopic Evaluation of Novel Adenine/Thymine-Conjugated Naphthalenediimides: Preference of Adenine-Adenine over Thymine-Thymine Intermolecular Hydrogen Bonding in Adenine- and Thymine-Functionalized Naphthalenediimides

  • Digambara PatraEmail author
  • Nadine Al Homsi
  • Sara Jaafar
  • Zeina Neouchy
  • Jomana Elaridi
  • Ali Koubeissi
  • Kamal H. BouhadirEmail author
ORIGINAL ARTICLE
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Abstract

The synthesis and spectroscopic characterization of novel nucleobase (adenine/thymine)-conjugated naphthalenediimides (NDIs), namely, NDI-AA, NDI-TT, and NDI-AT have been successfully achieved. NDI-AA, NDI-TT and NDI-AT have similar absorption in the 300–400 nm region. The effect of solvent on the absorption spectrum indicates aggregation, either through intermolecular π-σ interaction among the main chromophore or through intermolecular hydrogen bonding between adenine and adenine group. Addition of water does not assist hydrogen bond formation between thymine-thymine, rather increasing the polarity of the solvent encourages π-σ interaction among NDI-TTs. No spectral change for NDI-TT with increasing temperature confirms hydrogen bonding is not playing a crucial role in NDI-TT. A fluorescence study on NDI-AA also establishes excimer formation along with ground state aggregation. As the water content in the solvent mixture increases, aggregation of NDI-AA is discouraged due to adenine-adenine hydrogen bonding in accordance with earlier results. At the same time, the NDI-TT emission spectrum does not shift to the blue region and the intensity of the peak around 535 nm increases at the expense of fluorescence in 411 nm. Thus, increasing water content in the solvent mixture facilitates aggregation through π-σ interaction in NDI-TT as thymine-thymine hydrogen bonding is less pronounced.

Keywords

Naphthalenediimide Adenine Thymine Absorption Fluorescence Hydrogen bonding 

Notes

Acknowledgements

The authors are grateful to the Lebanese National Council for Scientific Research (LNCSR), the University Research Board (URB) and the Kamal Shair CRSL research fund at the American University of Beirut for financial support.

Supplementary material

10895_2018_2340_MOESM1_ESM.docx (1.4 mb)
ESM 1 (DOCX 1443 kb)

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • Digambara Patra
    • 1
    Email author
  • Nadine Al Homsi
    • 1
  • Sara Jaafar
    • 1
  • Zeina Neouchy
    • 1
  • Jomana Elaridi
    • 2
  • Ali Koubeissi
    • 1
  • Kamal H. Bouhadir
    • 1
    Email author
  1. 1.Department of ChemistryAmerican University of BeirutBeirutLebanon
  2. 2.Department of Natural SciencesLebanese American UniversityBeirutLebanon

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