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

C. J. Barnes (), M. Valden and M. Pessa
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C. J. Barnes: School of Chemical Sciences, Dublin City University, Glasnevin, Dublin 9, Ireland
M. Valden: Surface Science Laboratory, Tampere University of Technology, PO Box 692, FIN-33101, Tampere, Finland
M. Pessa: Optoelectronics Research Centre, Tampere University of Technology, PO Box 692, FIN-33101, Tampere, Finland

Surface Review and Letters (SRL), 2000, vol. 07, issue 01n02, 67-74

Abstract: Adsorption of benzene on (10${\rm Co}(10{\bar 1}0)$leads to formation of an ordered p(3 × 1) monolayer. ARPES measurements combined with adlayer density considerations indicate that the${\rm Co}(10{\bar 1}0)\mbox{-}{\rm p}(3 \times 1)$monolayer consists of molecules whose symmetry has been reduced to C1consistent with a partially dehydrogenated tilted cyclic C6intermediate (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${\rm Co}(10{\bar 1}0)$0) to be particularly active towards both C–H bond scission and ring opening.

Date: 2000
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DOI: 10.1142/S0218625X00000105

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