title: Communication: Substrate induced dehydrogenation: transformation of octa-ethyl-porphyrin into tetra-benzo-porphyrin.
abstract: Individual molecules of octa-ethyl-porhphyrin-iron(III)-chloride adsorbed on a Cu(111) surface are studied by scanning tunneling microscopy. Upon moderate heating the molecules are found to transform into Fe-tetra-benzo-porphyrin at a surprisingly low temperature of 380 K. If the annealing is interrupted, the different steps of the transformation can be imaged. By evaluating the ratio of transformed molecules as function of annealing temperature, an approximate activation energy of 1.2 eV ± 0.1 eV could be determined.
authors.affiliation: Faculty of Physics and Center for Nanointegration Duisburg-Essen, University of Duisburg-Essen, Lotharstr. 1-21, 47048 Duisburg, Germany.
authors.forename: D
authors.initials: D
authors.lastname: van Vörden
authors.forename: M
authors.initials: M
authors.lastname: Lange
authors.forename: M
authors.initials: M
authors.lastname: Schmuck
authors.forename: J
authors.initials: J
authors.lastname: Schaffert
authors.forename: M C
authors.initials: MC
authors.lastname: Cottin
authors.forename: C A
authors.initials: CA
authors.lastname: Bobisch
authors.forename: R
authors.initials: R
authors.lastname: Möller
mesh_terms: D002712:Chlorides / Q000737:chemistry*; D005290:Ferric Compounds / Q000737:chemistry*; D006865:Hydrogenation; D008665:Metalloporphyrins / Q000737:chemistry*; D016252:Microscopy, Scanning Tunneling; D015394:Molecular Structure; D011166:Porphyrins / Q000737:chemistry*; D013696:Temperature
chemical_list: D002712:Chlorides; D005290:Ferric Compounds; D008665:Metalloporphyrins; D011166:Porphyrins; C024555:ferric chloride