Anhydride ring chemistry at a metal surface

S Haq, RC Bainbridge, BG Frederick, Neville Vincent Richardson

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

The adsorption of phthalic anhydride on clean and oxygen predosed Cu{110} surfaces has been studied by Fourier transform infrared spectroscopy in the temperature range 95-300 K. Further characterization of the adsorbed species and its thermal stability on these surfaces has been obtained from thermal desorption measurements. A variety of species are produced on the clean surface including the parent molecule, one in which the anhydride ring has been cleaved and one following the loss of a CO unit which is the stable form at room temperature. In the presence of oxygen, CO loss is prevented and, instead, a phthalate species is formed. Infrared spectroscopy is ideally suited to identify these species and their orientation, which varies both with coverage and temperature in a complex manner. Thermal breakdown of the molecule occurs above 530 K on the clean surface to produce a variety of gas-phase products including benzene. The breakdown occurs at a somewhat higher temperature (585 K) in the case of the oxygen-predosed surface and leads to an explosive release of the products into the gas phase.

Original languageEnglish
Pages (from-to)8807-8815
Number of pages9
JournalJournal of Physical Chemistry B
Volume102
Publication statusPublished - 29 Oct 1998

Keywords

  • MOLECULAR LAYER DEPOSITION
  • PYROMELLITIC DIANHYDRIDE
  • VIBRATIONAL-SPECTRA
  • POLYIMIDE PRECURSORS
  • PHTHALIC-ANHYDRIDE
  • CU(110)
  • GROWTH
  • ORDER
  • FILMS
  • ACID

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