Journal
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume 255, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2021.119708
Keywords
Alloxazine; Tautomerization; Double Proton Transfer; Reverse Micelle; Nano-droplet
Categories
Funding
- DST-SERB, India [EMR/2017/000387]
- CSIR, India
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Alloxazine phototautomerization occurs through an excited state double proton transfer mechanism involving cyclic intermolecular hydrogen-bonded complexes with hydroxylic solvents. In AOT/alkane dispersions, water addition switches on the tautomerization process by forming water nano-droplets, while phototautomerization is hindered in Glycerol due to steric considerations.
Alloxazine phototautomerization is believed to occur through an excited state double proton transfer (ESDPT) mechanism involving cyclic intermolecular H-bonded complexes between Alloxazine and hydroxylic solvents like water and alcohols. In AOT/alkane dispersions in the absence of any polar liquid, Alloxazine molecules reside inside the polar core of the AOT reverse micelle nanoparticles, where they involve in H-bonding with the anionic sulfonate head-groups of the AOT molecules, but are unable to generate the appropriate cyclic intermolecular H-bonded complexes conducive to ESDPT. However, tautomerization is switched on with addition of water and formation of water nano-droplet at the core of reverse micelle. Evidently, the Alloxazine center dot center dot center dot center dot AOT H-bonds are now replaced by Alloxazine... Water H bonds, promoting ESDPT. On the other hand, Alloxazine phototautomerization is hindered in Glycerol, irrespective of whether the latter is in the bulk liquid state or in the form of a polar nano-droplet. This may be explained by steric considerations. (c) 2021 Elsevier B.V. All rights reserved.
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