Evolutional mechanism of 1-ethyl-3-methyl-imdazolium acetate uptaking water from air detected with a new coupled method: Two-dimensional correlation difference spectroscopy

A new coupled spectroscopy, i.e., two-dimensional correlation difference spectroscopy 2D-CODS, by combining two-dimensional correlation spectroscopy 2D-COS and difference spectroscopy DS, is proposed for the first time, illustrated with several simulated spectra, and then utilized to explore the dynamic atmospheric water sorption mechanism in ionic liquid [EMIM][Ac].87