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Issue 12, 2005
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Adding water to sugar: A spectroscopic and computational study of α- and β-phenylxyloside in the gas phase

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Abstract

The gas phase structures of phenyl α- and β-D-xylopyranoside (α- and β-pXyl) and their mono-hydrates have been investigated using a combination of resonant two-photon ionization (R2PI), ultra-violet hole-burning and resonant infrared ion dip spectroscopy, coupled with density functional theory (DFT) and ab initio computation. The hole-burning experiments indicate the population of a single conformer only, in each of the two anomers. Their experimental and calculated infrared spectra are both consistent with a conformational assignment corresponding to the computed global minimum configuration. All three OH groups are oriented towards the oxygen atom (O1) on the anomeric carbon atom to form an all trans (ttt) counter-clockwise chain of hydrogen bonds. The mono-hydrates, α- and β-pXyl(H2O) each populate two distinct structures in the molecular beam environment, with the water molecule inserted between OH4 and OH3 or between OH3 and OH2 in α-pXyl(H2O), and between OH2 and O1 in either of two alternative orientations, in β-pXyl(H2O). In all of the mono-hydrated xyloside complexes, the water molecule inserts into the weakest link of the sugar molecules’ hydrogen-bonded chain of hydroxy groups, creating a single extended chain, strengthened by co-operativity. The all-trans configuration of the xylose moiety is retained and the mono-hydrate structures correspond to those calculated to lie at the lowest relative energies.

Graphical abstract: Adding water to sugar: A spectroscopic and computational study of α- and β-phenylxyloside in the gas phase

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Publication details

The article was received on 23 Mar 2005, accepted on 27 Apr 2005 and first published on 17 May 2005


Article type: Paper
DOI: 10.1039/B504230E
Citation: Phys. Chem. Chem. Phys., 2005,7, 2474-2480
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    Adding water to sugar: A spectroscopic and computational study of α- and β-phenylxyloside in the gas phase

    I. Hünig, A. J. Painter, R. A. Jockusch, P. Çarçabal, E. M. Marzluff, L. C. Snoek, D. P. Gamblin, B. G. Davis and J. P. Simons, Phys. Chem. Chem. Phys., 2005, 7, 2474
    DOI: 10.1039/B504230E

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