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MO: Fachverband Molekülphysik
MO 14: Vibrational and Rotational Spectroscopy
MO 14.4: Vortrag
Mittwoch, 11. März 2020, 15:15–15:30, f142
Contact Ion Pairs of Phosphate Groups in Water — •Jakob Schauss, Achintya Kundu, Benjamin P. Fingerhut, and Thomas Elsaesser — Max-Born-Institut, Berlin, Deutschland
Negatively charged phosphate groups in the RNA backbone are key to the formation of an ordered solvation shell around the molecule. Interactions of these phosphate groups with alkali and alkaline earth ions in the surrounding solvent strongly impact RNA structure and folding dynamics. Dynamics of ionic arrangements as well as molecular coupling mechanisms of these interactions still escape our current understanding.
In our investigations we employ 2D infrared spectroscopy and microscopic density functional theory simulations on phosphate vibrations. Using the model system dimethyl phosphate in water with an added excess of Mg2+, Ca2+, and Na+ ions we were able to observe and analyze the formation of contact ion pairs. [1]
[1] Schauss et al., J. Phys. Chem. Lett., 10, 6281-6286 (2019)