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Title: Characterization of the primary hydration shell of the hydroxide ion with H2 tagging vibrational spectroscopy of the OH- ∙ (H2O)n=2,3 and OD- ∙ (D2O)n=2,3 clusters

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.4962912· OSTI ID:1474097

In this paper, we report the isotope-dependent vibrational predissociation spectra of the H2-tagged OH- ∙ (H2O)n=2,3 clusters, from which we determine the strongly coordination-dependent energies of the fundamentals due to the OH groups bound to the ion and the intramolecular bending modes of the water molecules. The HOH bending fundamental is completely missing in the delocalized OH- ∙ (H2O) binary complex but is recovered upon adding the second water molecule, thereby establishing that the dihydrate behaves as a hydroxide ion solvated by two essentially intact water molecules. The energies of the observed OH stretches are in good agreement with the values predicted by Takahashi and co-workers [Phys. Chem. Chem. Phys. 17, 25505 (2015); 15, 114 (2013)] with a theoretical model that treats the strong anharmonicities at play in this system with explicit coupling between the bound OH groups and the O–O stretching modes on an extended potential energy surface. We highlight a surprising similarity between the spectral signatures of OH- ∙ (H2O)3 and the excess proton analogue, H3O+ ∙ (H2O)3, both of which correspond to completed hydration shells around the proton defect. Finally, we discuss the origin of the extreme solvatochromicity displayed by both OH- and H+ in the context of the anomalously large “proton polarizabilities” of the H5O2+ and H3O2- binary complexes.

Research Organization:
Univ. of Pittsburgh, PA (United States); Yale Univ., New Haven, CT (United States); Univ. of the Virgin Islands, St. Thomas, VI (United States); Univ. of Washington, Seattle, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
FG02-06ER15800; FG02-00ER15066; FG02-06ER15066
OSTI ID:
1474097
Alternate ID(s):
OSTI ID: 1328508
Journal Information:
Journal of Chemical Physics, Vol. 145, Issue 13; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 26 works
Citation information provided by
Web of Science

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