Shape selectivity stationary-phase chemistry

Their main advantage over organic solvents for applications in analytical chemistry is their low volatility coupled with high thermal stability up to 260°C, which make them useful as solvents for working at high temperatures, and also as stationary phases in GC.101102 They provide symmetrical peak shapes, and because their ranges of solvation-type interaction are different for anions and cations, they exhibit a dual selectivity behavior. 

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