Abstract

Chemical exchange of species among different molecules occurs in many reactions. For solvent reactions, this exchange can occur on a time scale of picoseconds and is impossible to follow with conventional methods such as nuclear magnetic resonance. In his Perspective, [Dlott][1] discusses results reported in the same issue by [ Zheng et al. ][2] in which infrared laser pulses were used to observe chemical exchange reactions as phenol molecules formed solvent complexes in benzene liquid on a time scale of picoseconds. The method opens the possibility of a general method for studying fast chemical exchange in aqueous solvents and biomolecules. [1]: http://www.sciencemag.org/cgi/content/full/309/5739/1333 [2]: http://www.sciencemag.org/cgi/content/short/309/5739/1338

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