Photoacid as an Efficient ICT Probe for Understanding the Ground State Proton Transfer (GSPT) Process from Solute to Solvents
Anas D Fazal , Trupti D Solanky , Abhishek R Patel and Sumit K Panja*
1Tarsadia Institute of Chemical Science, Uka Tarsadia University, Maliba Campus, Gopal Vidyanagar, Bardoli, Mahuva Road, Surat, Gujarat India .
Corresponding author Email: sumitkpanja@gmail.com
DOI: http://dx.doi.org/10.13005/OJPS08.02.01
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Fazal A. D, Solanky T. D, Patel A. R, Panja S. K. Photoacid as an Efficient ICT Probe for Understanding the Ground State Proton Transfer (GSPT) Process from Solute to Solvents. Oriental Jornal of Physical Sciences 2023; 8(2).
DOI:http://dx.doi.org/10.13005/OJPS08.02.01
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Fazal A. D, Solanky T. D, Patel A. R, Panja S. K. Photoacid as an Efficient ICT Probe for Understanding the Ground State Proton Transfer (GSPT) Process from Solute to Solvents. Oriental Jornal of Physical Sciences 2023; 8(2). Available here:https://bit.ly/3Fs1T2C
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Article Publishing History
Received: | 14-08-2023 |
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Accepted: | 20-10-2023 |
Intermolecular interactions play a crucial role for the generation of physiologically active compounds, novel functional materials, and mechanisms for chemical and biological recognition and rational drug design.1-2 The creation of useful novel materials and enhanced understanding of mechanism of formation of cluster in solution depend greatly upon the research of fundamental intermolecular interactions.2 The intermolecular interaction between solvent & solute can be described by intermolecular H-bonding interaction at ground and excited state.3-4 Excited state intermolecular proton transfer (ESPT) process of photoacid has been comprehensively examined so far.5-7 However ground state proton transfer (GSPT) process from solute to solvents are infrequently pragmatic. Photoacid have unique characteristic feature to exhibit microsolvation behavior with protic solvent via intermolecular H-bonding interactions.8-9
Upon electronic excitation, photoacids has shown significant changes of their acidity and exhibit distinct pKa values in ground & excited state.10 Solute-Solvent interaction via intermolecular H-bonding interaction & degree of photoacidity of photoacids are responsible for efficiently GSPT transfer process from solute to solvent.11-12 The microsolvation behavior of photoacid in protic solvents depends upon strength of intermolecular H-bonding interaction & degree of photoacidity at ground and excited state. It is also pragmatic that electron withdrawing group enhances photoacidity of photoacid in solutions and makes photoacids as ICT probe for GSPT and ESPT process from solute to solvents.8-9
Microsolvation is a key phenomenon and has been widely studied in protic solvents, especially in water.13 The microsolvation of photoacids provides better understanding for proton transfer phenomena from solute to solvents, considering solute molecule enclosed by solvent molecule.13-14 Photoacid is an important class of molecule used as molecular probe for determining structural transitions of proteins & water accessibility in biological surfaces.15-16 Electronic structure of hydrated cluster has been calculated to provide molecular level understanding about hydration process of photoacid.17-18 Phenol is considered as simplest photoacid and also works as chromophore in aromatic amino acid in biological system.19-20 The interaction between phenol & solvent molecule is considered as model system for understanding the molecular level microsolvation behavious of phenol clusters.14, 21-22 In neutral condition, phenol behaves as weak ICT probe but in basic solutions, it shows strong ICT probe due to the enhancement of intermolecular charge transfer (ICT) process in solution.23 In homogeneous clusters such as water/aliphatic alcohol, water/aromatic alcohol, aliphatic alcohol/aromatic alcohol and other similar complicated systems are also inspected via UV and IR spectroscopic methods.12 Precise disturbance of the clusters can lead to red shift of O-H vibrational stretching by alternation of H-bonding interaction which happens between solute & solvent in solution.24
Recent studies indicate that microsolvation of photoacids can have a considerable impact on solute in the ground state proton transfer in solution.25 Photoacid has a great importance in different chemical, pharmaceutical and fragrant industries etc. It can also be used for the conformational changes of complex biological systems and in many complex reactions. Further, degree of photoacid related to efficient ICT probe to investigate GSPT from solute to solvent & impact of electron withdrawing group on photoacidity should be studied further applications in complex chemical, pharmaceutical and biological systems.
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