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Quantitative insights into the adsorption structure of diindeno[1,2-a;1′,2′-c]fluorene-5,10,15-trione (truxenone) on a cu(111) surface using X-Ray Standing Waves

DOI: 10.1021/acsomega.1c04799 DOI Help

Authors: David A. Duncan (Diamond Light Source) , Philip J. Blowey (Diamond Light Source, University of Warwick) , Tien-Lin Lee (Diamond Light Source) , Francesco Allegretti (Technical University of Munich) , Christian B. Nielsen (Queen Mary University of London) , Luke A. Rochford (Diamond Light Source; University of Warwick)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Acs Omega

State: Published (Approved)
Published: December 2021
Diamond Proposal Number(s): 13947

Open Access Open Access

Abstract: The adsorption structure of truxenone on Cu(111) was determined quantitatively using normal-incidence X-ray standing waves. The truxenone molecule was found to chemisorb on the surface, with all adsorption heights of the dominant species on the surface less than ∼2.5 Å. The phenyl backbone of the molecule adsorbs mostly parallel to the underlying surface, with an adsorption height of 2.32 ± 0.08 Å. The C atoms bound to the carbonyl groups are located closer to the surface at 2.15 ± 0.10 Å, a similar adsorption height to that of the chemisorbed O species; however, these O species were found to adsorb at two different adsorption heights, 1.96 ± 0.08 and 2.15 ± 0.06 Å, at a ratio of 1:2, suggesting that on average, one O atom per adsorbed truxenone molecule interacts more strongly with the surface. The adsorption geometry determined herein is an important benchmark for future theoretical calculations concerning both the interaction with solid surfaces and the electronic properties of a molecule with electron-accepting properties for applications in organic electronic devices.

Journal Keywords: Binding energy; Adsorption; Molecules; Carbonyls; X-ray photoelectron spectroscopy

Subject Areas: Chemistry, Physics

Instruments: I09-Surface and Interface Structural Analysis

Added On: 09/12/2021 14:50


Discipline Tags:

Surfaces Physics Electronics Chemistry Organic Chemistry

Technical Tags:

Diffraction Spectroscopy X-ray Standing Wave (XSW) X-ray Photoelectron Spectroscopy (XPS)