1990
DOI: 10.1016/0368-2048(90)80303-r
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The chemisorption of polyimide precursors and related molecules on metal surfaces

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Cited by 25 publications
(9 citation statements)
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“…There is already considerable evidence from vibrational spectroscopies, supported by X-ray photoemission, that room temperature adsorption of pyromellitic dianhydride, II , on a variety of surfaces, including Ag, , Ni, Cu, and Si, leads to loss of a CO unit and the resulting species has carboxylate character with which bonding to the substrate is effected in a bidentate, or more probably, a bridging manner. Our own previous EELS studies of phthalic anhydride adsorption on Cu{110} and Ni{110} surfaces agree with this conclusion. , We note, though, that adsorption onto the Pt{111} appears to be an exception, as PMDA has been found to adsorb intact on this surface. , Our previous studies were, however, limited to saturation exposure at room temperature. The coverage-dependent behavior, thermal evolution of the surface species, from 95 to 600 K, and stability of the various intermediates, as well as the influence of preadsorbed oxygen, are the subjects of this paper.…”
Section: Discussionmentioning
confidence: 99%
“…There is already considerable evidence from vibrational spectroscopies, supported by X-ray photoemission, that room temperature adsorption of pyromellitic dianhydride, II , on a variety of surfaces, including Ag, , Ni, Cu, and Si, leads to loss of a CO unit and the resulting species has carboxylate character with which bonding to the substrate is effected in a bidentate, or more probably, a bridging manner. Our own previous EELS studies of phthalic anhydride adsorption on Cu{110} and Ni{110} surfaces agree with this conclusion. , We note, though, that adsorption onto the Pt{111} appears to be an exception, as PMDA has been found to adsorb intact on this surface. , Our previous studies were, however, limited to saturation exposure at room temperature. The coverage-dependent behavior, thermal evolution of the surface species, from 95 to 600 K, and stability of the various intermediates, as well as the influence of preadsorbed oxygen, are the subjects of this paper.…”
Section: Discussionmentioning
confidence: 99%
“…By tilting the two phenyl rings at approximately 15-20°to the surface plane around an axis which does not include either nitrogen atom, it is possible to bring the nitrogen of the upper ring to a similar height to that of the lower molecule thus making it possible for both nitrogens to be coordinated to the surface. Surface vibrational spectroscopy indicates that the phenyl ring is orientated close to parallel to the surface [28,29] but to date, these studies have concerned aniline reactions only with clean surfaces where the surface concentration of phenyl imide may not be high enough to force the formation of the pi-stacked complex.…”
Section: Discussionmentioning
confidence: 98%
“…It has been reported that the molecule dissociates at clean Cu(1 1 0) surfaces to give an amide (PhNH(a)) in which the phenyl ring lies approximately parallel to the surface [28,29]. The aim of the present work was to investigate whether the reaction of the amine group with oxygen was affected by the differing basicity of aniline from pyridine and ammonia and the steric hindrance of the phenyl ring.…”
Section: Introductionmentioning
confidence: 97%
“…Discussion of PMDA Adsorption. The isolated PMDA molecule has a quasi-planar structure, close to D 2 h symmetry …”
Section: Adsorption Of Pyromellitic Dianhydridementioning
confidence: 99%
“…The isolated PMDA molecule has a quasi-planar structure, close to D 2h symmetry. 17 The strongest dipole active modes are associated with the stretching and bending modes of the anhydride groups. The symmetric (b 2u ) and asymmetric modes (b 1u ) of the ring C-O-C stretching vibrations are found at 1276 and 924 cm -1 , respectively.…”
Section: Adsorption Of Pmda On (2×1mentioning
confidence: 99%