S. Tjandra, F. Zaera
Jan 15, 1999
Citations
0
Influential Citations
19
Citations
Journal
Journal of Physical Chemistry A
Abstract
The thermal chemistry of 1,6-diiodohexane, 6-bromo-1-hexene, 1,5-hexadiene, methyl cyclopentane, methylene cyclopentane, and 1-methyl-1-cyclopentene on Ni(100) surfaces has been studied under ultrahigh vacuum conditions by X-ray photoelectron spectroscopy (XPS) and temperature-programmed desorption (TPD). The thermal activation of the diiodo alkane leads to the initial scission of the C−I bonds around 160 K, the same as with other iodoalkanes, and presumably results in the formation of a surface metallacyclic intermediate. Further heating of that system induces the desorption of hexene, hexane, iodohexane, methylene cyclopentane, benzene, and cyclohexene. The formation of the latter two cyclic products through 5-hexen-1-yl, methyl cyclopentane, methylene cyclopentane, or 1-methyl-1-cyclopentene intermediates was ruled out in this case because direct activation of those compounds does not lead to the desorption of any C6-cyclic molecules at all. TPD experiments with 1,5-hexadiene, on the other hand, did sh...