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Ionic deep eutectic solvents (DESs) made of acetamide and electrolyte are good reaction media and hold the promise to become cheaper alternative to ionic liquids in many applications. Interestingly, these DESs remain as stable liquids at temperatures much lower than the individual melting temperatures of the constituents. These liquids, as formed via avoiding crystallization via deep depression of freezing points, possess a certain degree of spatio-temporal heterogeneity.1-13 This heterogeneous solution character has been reflected through substantial excitation wavelength dependence of fluorescence emission energy of a dissolved dipolar probe, and strong decoupling of the probe’s average rotation and solvation times in them.6,7,9-13 In this talk, the solution structural aspect of acetamide/LiX DESs, with and , will be discussed with the help of simulations results exploring ion-amide and amide-amide interactions, and formation of the corresponding clusters. The size and lifetime distributions of such clusters and their dependence on anion will be presented. In addition, cluster-size and lifetime distributions will be connected to several anion dependent dynamic heterogeneity features and to the experimentally observed viscosity decoupling of rotation and solvation timescales in these media. |