01993nas a2200169   4500008004100000022001400041245008100055210006900136260000900205300001400214490000800228520141400236100002301650700002701673700001801700856010501718       2022                        eng d  a1520-610600aDoes viscosity drive the dynamics in an alcohol-based deep eutectic solvent?0 aDoes viscosity drive the dynamics in an alcoholbased deep eutect  cOCT   a8331-83370 v1263 a<p>
	Deep eutectic solvents, consisting of heterogeneous nano-domains of hydrogen-bonded networks, have evolved into a range of viscous fluids that find applications in several fields. As viscosity is known to influence the dynamics of other neoteric solvents like ionic liquids, understanding the effect of viscosity on deep eutectic solvents is crucial to realize their full potential. Herein, we combine polarization-selective pump-probe spectroscopy, two-dimensional infrared spectroscopy, and molecular dynamics simulations to elucidate the impact of viscosity on the dynamics of an alcohol-based deep eutectic solvent, ethaline. We compare the solvent fluctuation and solute reorientation time scales in ethaline with those in ethylene glycol, an ethaline constituent. Interestingly, we find that the solute's reorientation apparently scales the bulk viscosity of the solvent, but the same is not valid for the overall solvation dynamics. Using the variations in the estimated intercomponent hydrogen bond lifetimes, we show that a dissolved solute does not sense the bulk viscosity of the deep eutectic solvent; instead, it senses domain-specific local viscosity determined by the making and breaking of the hydrogen bond network. Our results indicate that understanding the domain-specific local environment experienced by the dissolved solute is of utmost importance in deep eutectic solvents.</p>
1 aChatterjee, Srijan1 aDeshmukh, Samadhan, H.1 aBagchi, Sayan  uhttps://library.ncl.res.in/content/does-viscosity-drive-dynamics-alcohol-based-deep-eutectic-solvent