000			a
999			_c8518 _d8518
003			OSt
005			20190315103055.0
008			190313b xxu||||| |||| 00| 0 eng d
040			_aAIKTC-KRRC _cAIKTC-KRRC
100			_98040 _aMelavanki, Raveendra
245			_aEffect of hydrogen bonding and solvent polarity on the fluorescence quenching and dipole moment of 2-methoxypyridin-3-yl-3-boronic acid
250			_aVol. 56(12), December
260			_aNew Delhi _bNISCAIR _c2018
300			_a989-996
520			_aTwo photophysical properties namely, fluorescence quenching and dipole moment (both ground state and excited state) of 2-methoxypyridin-3-yl-3-boronic acid (2MPBA) have been investigated in alcohol environment using steady state fluorescence technique at 300 K. In quenching studies, a rare but not unusual observation; negative Stern-Volmer (S-V) deviation has been noticed. It has been explained using the concept of solute’s conformational changes in the ground state due to inter-molecular and intra-molecular hydrogen bonding in alcohol environment. The spectroscopic data has been processed using Lehrer equation and thereby Stern-Volmer constant (KSV) has been evaluated. It has been found to be above 100 for most of the solvents used. The data related to dipole moment has been examined using different solvent polarity functions. Theoretical calculation of dipole moment in the ground state has been done using Gaussian software. The general solute–solvent interactions and hydrogen bond interactions have been found to be operative. An appreciable red shift of about 25 nm in the emission spectra has been identified with the rise in solvent polarity and decrease in molar mass of alcohols. It confirms the π→π* transition as well as the possibility of intra-molecular charge transfer (ICT) character in the emitting singlet state of 2MPBA.
650		0	_94639 _aPHARMACEUTICS
700			_98041 _aGeethanjali, H. S.
700			_98042 _aThipperudrappa, J.
773	0		_dNew Delhi CSIR-NISCAIR _x0019-5596 _tIndian journal of pure & applied physics (IJPAP)
856			_uhttp://nopr.niscair.res.in/handle/123456789/45461 _yClick here
942			_2ddc _cAR