Ground state proton transfer in phenol-(NH3)(n) (n ≤ 11) clusters studied by mid-IR spectroscopy in 3-10 µm range.
J Phys Chem A
; 117(7): 1522-30, 2013 Feb 21.
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| ID: mdl-23350693
ABSTRACT
The infrared (IR) spectra of size-selected phenol-ammonia clusters, PhOH-(NH(3))(n) (n ≤ 11) in the 3-10 µm wavelength region were measured to investigate the critical number of solvent molecules necessary to promote the ground state proton transfer (GSPT) reaction. While the N-H stretching vibrations did not provide clear information, characteristic changes that are assigned to the GSPT reaction were observed in the skeletal vibrational region. The production of phenolate anion (PhO(-)), which is a product of the GSPT reaction, was established from the appearance of characteristic bands assignable to C-C stretching and C-H bending vibrations of PhO(-) and from the corresponding disappearance of C-O-H bending vibration of PhOH at n = 9. The mid-IR spectroscopy directly proves the structural change induced by the deprotonation from the O-H bond and thus establishes the GSPT reaction as complete at n = 9. No such absorptions were observed for n ≤ 5 in line with a previous report. For n = 6-8, both the proton transferred and the nontransferred signatures were observed in the spectra, showing coexistence of both species for the first time.
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MEDLINE
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En
Revista:
J Phys Chem A
Asunto de la revista:
QUIMICA
Año:
2013
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Article