Enhanced Raman spectroscopic study of rotational isomers on metal surfacesSurfaced-enhanced Raman spectroscopy has been used to study rotational isomers of succinonitrile and N-methyl-thioacetamide on Cu and Ag surfaces. Both the gauche and trans conformers of succinonitrile are found to chemisorb on the metal surface. The doubly degenerate nu(C-triple bond-N) in the free molecules is removed when succinonitrile adsorbs on copper, which indicates that the two (C-triple bond-N) groups are no longer chemically equivalent. Both conformers are found to coordinate to the copper surface through the pi system of one of the two (C-triple bond-N) groups. In the case of N-methyl-thioacetamide, the population of the cis isomer is greatly increased on Cu and Ag surfaces. This is probably due to surface-induced cis-trans isomerization, in which the predominant trans isomer is converted to the cis isomer.
Document ID
19870039401
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Loo, B. H. (Alabama Univ. Huntsville, AL, United States)
Lee, Y. G. (Alabama, University Huntsville, United States)
Frazier, D. O. (NASA Marshall Space Flight Center Huntsville, AL, United States)