Proton transfer in naphthol/ammonia complexes: Deuteration effects

Journal Article · Thu Mar 21 04:00:00 EST 1991 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100159a058· OSTI ID:5637598

Swinney, T C; Kelley, D F ^[1]

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1. Colorado State Univ., Fort Collins (United States)

The effect of deuteration on the spectroscopy and proton-transfer dynamics of 10 K matrix-isolated {alpha}- and {beta}-naphthol{center dot}(NH{sub 3}){sub n} (n = 0, 1, 2, 3) complexes has been studied. Large changes in the cis:trans rotamer ratio of {beta}-naphthol are observed upon deuteration. These observations can be explained in terms of the energetics and relaxation dynamics of both forms. The deuteron-transfer times in the {alpha}-naphthol(-OD){center dot}(ND{sub 3}){sub 3} and {beta}-naphthol(-OD){center dot}(ND{sub 3}){sub 3} complexes were determined to be longer than several nanoseconds. Comparison with the corresponding proton-transfer rates indicates a kinetic isotope effect of {ge}200. These results can be understood in terms of a simple two-dimensional tunneling model.

• OSTI ID: 5637598
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 95:6; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102* -- Chemical & Spectral Procedures
400202 -- Isotope Effects
Isotope Exchange
& Isotope Separation
ABSORPTION SPECTROSCOPY
AMMONIUM COMPLEXES
ANIONS
AROMATICS
CHARGED PARTICLES
CHARGED-PARTICLE TRANSPORT
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COMPLEXES
DATA
DEUTERATION
DEUTERIUM
EMISSION SPECTRA
EMISSION SPECTROSCOPY
EXPERIMENTAL DATA
HYDROGEN ISOTOPES
HYDROXY COMPOUNDS
INFORMATION
IONS
ISOTOPE EFFECTS
ISOTOPES
KINETICS
LIGHT NUCLEI
MATHEMATICAL MODELS
MATRIX ISOLATION
NAPHTHOLS
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
PHENOLS
PROTON TRANSPORT
RADIATION TRANSPORT
REACTION KINETICS
SAMPLE PREPARATION
SPECTRA
SPECTROSCOPY
STABLE ISOTOPES
TEMPERATURE RANGE
TEMPERATURE RANGE 0000-0013 K
THERMODYNAMICS
ULTRAVIOLET SPECTRA
VISIBLE SPECTRA