LAUSR

Abstract The trinity of triethylamine, L-glutamic acid and water show the special property of reversible type inverse cooling phenomena which is the transformation of a transparent liquid to highly viscous quasi-liquid state with the increase of temperature, whereas, the mixture is capable of reversibly transform from the highly viscous quasi-liquid state to transparent liquid state on cooling of the system in a particular temperature range of 35 °C–55 °C. The binary mixture of triethylamine and water also show the similar behaviour in the temperature range of 40 °C–50 °C. Experimental evidences like temperature dependent viscosity, 1H NMR along with morphological studies support towards the temperature mediated alterations of supramolecular hydrogen bonding patterns within the system that might be responsible for the unusual observation.