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Crystalline Structures of Alkylamide Monolayers Adsorbed on the Surface of Graphite

DOI: 10.1021/la904587u DOI Help
PMID: 20095530 PMID Help

Authors: Tej Bhinde (University of Cambridge) , Stuart Clarke , Tamsin Phillips (University of Cambridge) , Tom Arnold (Diamond Light Source) , Julia Parker (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Langmuir , VOL 26 (11)

State: Published (Approved)
Published: January 2010

Abstract: Synchrotron X-ray and neutron diffraction have been used to determine the two-dimensional crystalline structures of alkylamides adsorbed on graphite at submonolayer coverage. The calculated structures show that the plane of the carbon backbone of the amide molecules is parallel to the graphite substrate. The molecules form hydrogen-bonded dimers, and adjacent dimers form additional hydrogen bonds yielding extended chains. By presenting data from a number of members of the homologous series, we have identified that these chains pack in different arrangements depending on the number of carbons in the amide molecule. The amide monolayers are found to be very stable relative to other closely related alkyl species, a feature which is attributed to the extensive hydrogen bonding present in these systems. The characteristics of the hydrogen bonds have been determined and are found to he in close agreement with those present in the bulk materials.

Subject Areas: Chemistry

Instruments: I11-High Resolution Powder Diffraction