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Monolayer Structures of Alkyl Aldehydes: Odd Membered Homologues

DOI: 10.1016/j.tsf.2010.12.084 DOI Help

Authors: T. K. Phillips (University of Cambridge) , S. M. Clarke (University of Cambridge) , T. Bhinde (University of Cambridge) , M. A. Castro (Instituto Ciencia de los Materiales de Sevilla, Universidad de Sevilla) , C. Millan (Instituto Ciencia de los Materiales de Sevilla, Universidad de Sevilla) , S. Medina (Tecnología e Innovación de la Universidad de Sevilla (CITIUS))
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Thin Solid Films

State: Published (Approved)
Published: January 2011

Abstract: The existence of solid monolayers formed at the interface between substrate and liquid bulk adsorbate is confirmed for C11 aldehyde using incoherent neutron scattering. Crystalline monolayers of three aldehydes with an odd number of carbon atoms in the alkyl chain (C7, C9 and C11) at low coverages are observed by a combination of x-ray and neutron diffraction. Analysis of the diffraction data is discussed and possible monolayer crystal structures are proposed, although unique structures could not be ascertained for all molecules. We conclude that the structures are flat on the surface, with the molecules lying in the plane of the layer. The C11 homologue is determined to have a plane group of either p2, pgb or pgg, and for the C7 homologue the p2 plane group is preferred.

Journal Keywords: Monolayer; Diffraction; Synchrotron; Neutrons

Subject Areas: Chemistry

Instruments: I11-High Resolution Powder Diffraction