Cryobiology and Cryotechnology
Online ISSN : 2424-1555
Print ISSN : 1340-7902
Molecular Behavior of 2-(1-pyridinio)benzimidazolate in Aqueous Solutions and in Saccharide Glasses
Atsushi TOYOAkifumi MATSUMOTOChikashi OTAYutaka NAGASAWA
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2019 Volume 64 Issue 2 Pages 91-95

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Abstract
We report solvatochromic shift of the absorption spectrum and fluorescent red-edge effect (REE) of a betaine molecule, 2-(1-pyridinio)benzimidazolate (SBPa) in saccharide glasses. Interestingly, SBPa exhibits REE even in aqueous solution, where the microscopic environmental inhomogeneity is normally averaged over time by the solvent thermal fluctuation. We conclude that SBPa exists in an equilibrium state between betaine and protonated form in aqueous solution. Thus, frequency shift of absorption and fluorescence spectra of SBPa could be not only a measure of solvent polarity but also that of solvent acidity, and the data are reanalyzed by the new knowledge. Nevertheless, Stokes shift of SBPa in trehalose glass is the smallest compared to other saccharide glasses measured in this study, indicating significant suppression of molecular fluctuation by trehalose glass.
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© 2019 Japanese Society of Cryobiology and Cryotechnology
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