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• W2089762016 abstract "Weakly-bound clusters of the closed-shell benzoyl cation (C(6)H(5)CO(+), PhCO(+)) with Ar and H(2)O are investigated by infrared (IR) spectroscopy, mass spectrometry, and quantum chemical calculations in order to characterize the interaction of a closed shell aromatic cation with a nonpolar and a polar ligand. PhCO(+)-L dimers are produced by electron ionization of benzaldehyde in a supersonic plasma expansion. IR photodissociation (IRPD) spectra of PhCO(+)-L with L = Ar and H(2)O are analyzed in the C-O, C-H, and O-H stretch ranges (2000-3900 cm(-1)). The potential energy surface of the PhCO(+)-L dimers is characterized at the MP2/6-311++G(2df,2pd) level to locate the various minima and determine their energetic and vibrational properties. PhCO(+)-Ar prefers intermolecular π-bonding to the aromatic ring with a bond energy of D(0) = 6 kJ mol(-1). The weak interaction implies that the IRPD spectrum of PhCO(+)-Ar is very close to the IR spectrum of bare PhCO(+). The detection of the C-H and C-O stretch fundamentals provides valuable information about the C-O and C-H bond strengths in this prototypical aromatic acylium ion. Moreover, a variety of weak combination and overtone bands are assigned. The global minimum on the PhCO(+)-H(2)O potential has a planar charge-dipole configuration with D(0) = 41 kJ mol(-1) (with only the two H(2)O protons being out-of-plane), in which the lone pairs of H(2)O interact with the positive partial charges on the carbonyl carbon atom and the proton of the CH group in ortho position. The experimental IRPD spectra are in accord with the calculated global minima. The analysis of the charge distribution shows that the PhCO(+) cation is best represented as an oxocarbenium ion (Ph-C(+)[double bond, length as m-dash]O) with smaller contributions of the ketene structure (Ph(+)[double bond, length as m-dash]C[double bond, length as m-dash]O). This view is supported by the geometrical and vibrational properties of PhCO(+) as well as the shape of the intermolecular PhCO(+)-L dimer potentials." @default.
• W2089762016 created "2016-06-24" @default.
• W2089762016 creator A5006728940 @default.
• W2089762016 creator A5033218594 @default.
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• W2089762016 date "2010-01-01" @default.
• W2089762016 modified "2023-10-02" @default.
• W2089762016 title "Infrared spectra and quantum chemical characterization of weakly bound clusters of the benzoyl cation with Ar and H2O" @default.
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• W2089762016 doi "https://doi.org/10.1039/c0cp00696c" @default.
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