Caffeine and taurine slow down water molecules

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Publication date
Reference W.J. Smit, E.P. Dam, R. Cota and H.J. Bakker, Caffeine and taurine slow down water molecules, J.Phys.Commun. 3, 2: 025010: 1-7 (2019)
Group Ultrafast Spectroscopy

In this work we study the effect of caffeine and taurine on the mobility of water molecules at 298 K using femtosecond mid-infrared and dielectric relaxation spectroscopy. We observe both molecules to have a slowing down effect on the mobility of surrounding water molecules: a single caffeine molecule slows down ~9 water molecules, a single taurine molecule slows down ~4 water molecules. The reorientation time constant of these slow water molecules is 4–5 times longer than the reorientation time constant of 2.5 ps of water molecules in bulk liquid water.