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Anomalous Dynamics in <i>tert</i>-Butyl Alcohol–Water and Trimethylamine <i>N</i>‑Oxide–Water Binary Mixtures: A Femtosecond Transient Absorption Study
In this article, we have investigated
the unusual dynamics of <i>tert</i>-butyl alcohol (TBA)–water
and trimethylamine <i>N</i>-oxide (TMAO)–water binary
mixtures using solvation
dynamics as a tool. For this purpose, femtosecond transient absorption
spectroscopy has been employed. Although these two molecules are isosteres
to each other, a significant difference in water dynamics has been
observed. The solvation times in TBA–water binary mixtures
are found to be between 1.5 and 15.5 ps. On the contrary, we have
observed very fast dynamics in TMAO–water binary mixtures (between
210 and 600 fs). Interestingly, unusual retardation in dynamics is
observed at 0.10 mole fraction of TBA and TMAO in both the binary
mixtures