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On‐Surface Hydrogen/Deuterium Isotope Exchange in Polycyclic Aromatic Hydrocarbons
Author(s) -
Wäckerlin Christian
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202015552
Subject(s) - coronene , deuterium , chemistry , hydrogen , adsorption , mass spectrometry , acenaphthene , photochemistry , analytical chemistry (journal) , inorganic chemistry , molecule , organic chemistry , physics , chromatography , quantum mechanics , anthracene
Hydrogen plays important roles in the on‐surface synthesis of carbon‐based materials in ultra‐high vacuum. The complex interplay between hydrogen and surface‐adsorbed polycyclic aromatic hydrocarbons (PAHs) is tracked by in situ time‐of‐flight secondary ion mass spectrometry (ToF‐SIMS) combined with isotope labeling. In situ deuterium labeling of prototypical PAHs, coronene (CR) and 7‐armchair graphene nanoribbons (GNRs), on Au(111) is achieved by annealing either in D 2 gas or in the vapor of perdeuterio‐acenaphthene. By following the mass spectra of in situ deuterated CR mixed with hydrogen‐CR, it is demonstrated that PAHs adsorbed at hot Au(111) surfaces continuously exchange hydrogen atoms. Also, D 2 present during the Ullmann coupling step leads to incorporation of deuterium and to shorter GNRs.