Operando UV Resonance Raman study of DNA-ionic liquids gels

Year: 2024

Authors: Rossi B., Catalini S., Mearini S., Matroodi F., Gessini A., Masciovecchio C., Mancini I., Mele A.

Autors Affiliation: Elettra Sincrotrone Trieste, SS 114 Km 163-5, I-34149 Trieste, Italy; Univ Trento, Dept Phys, Lab Bioorgan Chem, Via Sommarive 14, I-38123 Trento, Italy; Univ Perugia, Dipartimento Fis & Geol, Via Pascoli, I-06123 Perugia, Italy; European Lab Nonlinear Spect LENS, Via Nello Carrara 1, I-50019 Sesto Fiorentino, Firenze, Italy; CNR INO, Largo Fermi 6, I-50125 Florence, Italy; Shahid Chamran Univ Ahvaz, Dept Phys, Ahvaz, Iran; Politecn Milan, Dept Chem Mat & Chem Engn G Natta, Piazza L Da Vinci 32, Milan 20133, Italy.

Abstract: Double-stranded DNA dissolved in aqueous solutions of imidazolium-based Ionic Liquids (ILs) exhibits a characteristic gel transition, leading to the formation of DNA ionogels. In this study, we utilize state-of-the-art operando UV Resonance Raman (UVRR) spectroscopy, along with UV and Circular Dichroism (CD) absorption experiments, to monitor the self-assembly of a class of DNA ionogels derived from low-concentration aqueous solutions of DNA in imidazolium-based ILs. Our experimental approach offers insights at the molecular level into the structural organization and interactions that stabilize the gel network. Furthermore, operando UVRR spectroscopy allows efficient monitoring of the different stages of the thermal pathway leading to the self-assembly of DNA/ILs solutions into ionogels. A key achievement of our study is demonstrating that the sol-gel transition in DNA ionogels in the presence of imidazolium-based ILs can be modulated by the length of the alkyl chain of the imidazolium cation to achieve desired premelting, melting, and gelation temperatures.

Journal/Review: JOURNAL OF MOLECULAR LIQUIDS

Volume: 398      Pages from: 124209-1  to: 124209-11

More Information: The authors acknowledge the CERIC-ERIC Consortium for the access to experimental facilities and financial support (proposal 20192179 and 20197165). S.C. thanks the research project FSE-REACT EU financed by National Social Fund-National Operative Research Program and Innovation 2014-2020 (D.M. 1062/2021), personal Grant number 23-G15445-3.; FM gratefully acknowledges funding by TRIL Program of the Abdus Salam International Centre for Theoretical Physics (ICTP).
KeyWords: UV Resonance Raman; DNA; Ionogels; Imidazolium; Ionic liquids
DOI: 10.1016/j.molliq.2024.124209

Citations: 1
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