THE UNUSUAL ADSORPTION BEHAVIOUR OF BENZENE ON ${\rm Co}(10{\bar 1}0)$

Author:

BARNES C. J.1,VALDEN M.2,PESSA M.3

Affiliation:

1. School of Chemical Sciences, Dublin City University, Glasnevin, Dublin 9, Ireland

2. Surface Science Laboratory, Tampere University of Technology, PO Box 692, FIN-33101, Tampere, Finland

3. Optoelectronics Research Centre, Tampere University of Technology, PO Box 692, FIN-33101, Tampere, Finland

Abstract

Adsorption of benzene on (10[Formula: see text] leads to formation of an ordered p(3 × 1) monolayer. ARPES measurements combined with adlayer density considerations indicate that the [Formula: see text] monolayer consists of molecules whose symmetry has been reduced to C1 consistent with a partially dehydrogenated tilted cyclic C6 intermediate (phenyl or C6H4). Desorption measurements in conjunction with ARPES indicate that a stepwise dehydrogenation of the ring occurs with the dehydrogenation step above room temperature at ~ 380 K corresponding to formation of small well-oriented CxHy (x, y = 1 or 2) hydrocarbon fragment(s) (possibly C2H and CH) resulting from ring opening. Complete dehydrogenation occurs for temperatures above 550 K, leaving a carbonaceous residue. The low dehydrogenation and decomposition temperatures indicate [Formula: see text]0) to be particularly active towards both C–H bond scission and ring opening.

Publisher

World Scientific Pub Co Pte Lt

Subject

Materials Chemistry,Surfaces, Coatings and Films,Surfaces and Interfaces,Condensed Matter Physics

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