Filming the Birth of Molecules and Accompanying Solvent Rearrangement

Jae Hyuk Lee, Michael Wulff, Savo Bratos, Jakob Petersen, Laurent Guerin, Jean-Claude Leicknam, Marco Cammarata, Qingyu Kong, Jeongho Kim, Klaus Braagaard Møller, Hyotcherl Ihee

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Abstract

Molecules are often born with high energy and large-amplitude vibrations. In solution, a newly formed molecule cools down by transferring energy to the surrounding solvent molecules. The progression of the molecular and solute−solvent cage structure during this fundamental process has been elusive, and spectroscopic data generally do not provide such structural information. Here, we use picosecond X-ray liquidography (solution scattering) to visualize timedependent structural changes associated with the vibrational relaxation of I2 molecules in two different solvents, CCl4 and cyclohexane. The birth and vibrational relaxation of I2 molecules and the associated rearrangement of solvent molecules are mapped out in the form of a temporally varying interatomic distance distribution. The I−I distance increases up to ∼4 Å and returns to the equilibrium distance (2.67 Å) in the ground state, and the first solvation cage expands by ∼1.5 Å along the I−I axis and then shrinks back accompanying the structural change of the I2 molecule

Original languageEnglish
JournalJournal of the American Chemical Society
Volume135
Pages (from-to)3255−3261
ISSN0002-7863
DOIs
Publication statusPublished - 2013

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