Structure-sensitive enantiospecific adsorption on naturally chiral Cu(hkl)R&S surfaces
The desorption kinetics of a chiral compound, R-3-methylcyclohexanone (R-3MCHO), have been measured on both enantiomers of seven chiral Cu(hkl)R&S surfaces and on nine achiral Cu single crystal surfaces with surface structures that collectively span the various regions of the stereographic trian...
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Published in | Journal of physics. Condensed matter Vol. 29; no. 3 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
IOP Publishing
15.11.2016
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Subjects | |
Online Access | Get full text |
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Summary: | The desorption kinetics of a chiral compound, R-3-methylcyclohexanone (R-3MCHO), have been measured on both enantiomers of seven chiral Cu(hkl)R&S surfaces and on nine achiral Cu single crystal surfaces with surface structures that collectively span the various regions of the stereographic triangle. The naturally chiral surfaces have terrace-step-kink structures formed by all six possible combinations of the three low Miller index microfacets. The chirality of the kink sites is defined by the rotational orientation of the (1 1 1), (1 0 0) and (1 1 0) microfacets forming the kink. R-3MCHO adsorbs reversibly on these Cu surfaces and temperature programmed desorption has been used to measure its desorption energetics from the chiral kink sites. The desorption energies from the R- and S-kink sites are enantiospecific, ΔΔEdesS−R=ΔEdesS−ΔEdesR≠0, on the chiral surfaces. The magnitude of the enantiospecificity is |ΔΔEdesS−R| 1 kJ mol−1 on all seven chiral surfaces. However, the values of ΔΔEdesS−R are sensitive to elements of the surface structure other than just their sense of chirality as defined by the rotational orientation of the low Miller index microfacets forming the kinks; ΔΔEdesS−R changes sign within the set of surfaces of a given chirality. |
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Bibliography: | JPCM-107756.R1 |
ISSN: | 0953-8984 1361-648X |
DOI: | 10.1088/0953-8984/29/3/034001 |