Fig. 2: Molecular Structure of a Contact Ion Pair | Two-Dimensional Infrared Spectra (IMAGE)
Caption
Top: Molecular structure of a contact ion pair consisting of dimethylphosphate (DMP) and a magnesium ion Mg2+ embedded in water. The arrows mark the elongations of the phosphorus-oxygen bonds in the asymmetric PO2- stretching vibration. Bottom: Two-dimensional infrared (2D-IR) spectra of the asymmetric PO2- stretching vibration measured at a waiting time T=500 fs after vibrational excitation. The vibrational response is shown as a function of the infrared excitation and the detection frequencies and consists of a component P1 from DMP molecules without a magnesium ion in the neighborhood and the contribution P2 from contact ion pairs. The latter is shifted to higher frequencies due to the interaction between PO2- and Mg2+.
Credit
MBI Berlin
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