Observation of different reactivities of para and ortho-water towards trapped diazenylium ions.
Observation of different reactivities of para and ortho-water towards trapped diazenylium ions.
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DOI:
10.1038/s41467-018-04483-3
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发表时间:
2018-05-29
影响因子:
16.6
通讯作者:
Willitsch S
中科院分区:
文献类型:
--
作者:
Kilaj A;Gao H;Rösch D;Rivero U;Küpper J;Willitsch S
Water is one of the most fundamental molecules in chemistry, biology and astrophysics. It exists as two distinct nuclear-spin isomers, para- and ortho-water, which do not interconvert in isolated molecules. The experimental challenges in preparing pure samples of the two isomers have thus far precluded a characterization of their individual chemical behavior. Capitalizing on recent advances in the electrostatic deflection of polar molecules, we separate the ground states of para- and ortho-water in a molecular beam to show that the two isomers exhibit different reactivities in a prototypical reaction with trapped diazenylium ions. Based on ab initio calculations and a modelling of the reaction kinetics using rotationally adiabatic capture theory, we rationalize this finding in terms of different rotational averaging of ion-dipole interactions during the reaction. Water molecules exist as two distinct nuclear-spin isomers denoted ortho and para. Here, the authors separate these two isomers in the gas phase to show that they exhibit different reactivities in a prototypical proton-transfer reaction.
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