Author:
Goldberg M. J.,Clabes J. G.,Viehbeck A.,Kovac C. A.
Abstract
ABSTRACTWe have studied the reactions occurring for the deposition of chromium onto pyromellitic dianhydride -4,4′-oxydianiline (PMDA-ODA) polyimide for a wide range of metal coverages, using X-ray photoelectron spectroscopy as well as solution studies involving model compounds. A multi-step, coverage-dependent, mechanism is proposed which includes an initial electron transfer from Cr to PMDA-ODA. followed by formation of Cr-O and and Cr-N polymer-bound intermediates, At higher metal coverage, Cr-oxides and Cr-nitrides are formed which may activate the polymer for subsequent formation of Cr-carbide. No evidence was obtained in support of a model involving initial formation of a π-arene complex between chromium atoms and PMDA-ODA. In the course of this work we have shown that similarities exist between the chemistry of metal atoms in condensed phases and the reactions occurring between metal atoms and surfaces.
Publisher
Springer Science and Business Media LLC
Reference28 articles.
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3. Flash photolysis of chromium hexacarbonyl in perfluorocarbon solvents. Observation of a highly reactive chromium pentacarbonyl
4. 9. Jordan-Sweet J.L. , Kovac C.A. , Goldberg M.J. , Morar J.F. , J. Chem. Phys. (in press).
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