Nuclear Magnetic Resonance Study of Caesium-133 in Binary Molten Trifluoroacetate Salt Mixtures

The use of molten salts as novel green solvents which may replace conventional media in chemical processes implies a good knowledge of their micro­ scopic structure [1]. As known, high temperature NMR spectroscopy has been applied successfully to molten salts. This technique permits to obtain information about the structure and dynamics of the local environment of most of the nuclei in salt melts [2, 3]. In the present work the chemical shifts 133Cs in molten binary mixtures of caesium trifluoroacetate with lithium, sodium, potassium, and thallium triflu­ oroacetates have been studied as functions of the com­ position of these binary melts. The 133Cs nucleus (natural abundance 100%) has a spin of 7/2 and high NMR receptivity. The moderate chemical shift range of 133Cs is approximately 300 ppm or more [4], However the NMR studies on these nuclei are rather limited, especially at high tempera­ ture.