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NEXAFS study of a Pt-containing rod-like organometallic polymer (Pt-DEBP): molecular orientation onto HOPG, Au/Si(1 1 1), Cr/Si(1 1 1) and Si(1 1 1) surfaces
Authors:C Battocchio  I Fratoddi  MV Russo and G Polzonetti
Institution:

aDepartment of Chemistry, University ‘La Sapienza’ P. le A. Moro, 5, 00185 Rome, Italy

bDepartment of Physics and unità INFM, INSTM and CISDiC, University ‘Roma Tre’ of Rome, Via della Vasca Navale, 84-00146 Rome, Italy

Abstract:The influence of different substrates on the molecular orientation of organometallic polymer Pt-DEBP, single bondPtsingle bond(PBu3)2single bondCtriple bond; length of mdashCsingle bondC12H8single bondCtriple bond; length of mdashCsingle bond]n, has been investigated by NEXAFS spectroscopy. Thin films were deposited on HOPG, Au/Si(1 1 1), Cr/Si(1 1 1), Si(1 1 1) and stainless steel. The assignment of the spectral features has been carried out on the basis of previous STEX calculations performed on phenylacetylene model molecule in gas phase and adsorbed on Pt(1 1 1) and Cu(1 0 0). Angular dependent analysis of the π* resonance occurring at 285.50 eV photon energy deriving by the benzene carbon orbitals showed a polarisation effect for all substrates. A preferential molecular orientation at nearly 40° to the surface normal was observed. This result might be explained by the strong interaction between sp and sp2 carbons of the organic diethynylbiphenyl DEBP moiety contained in close chains, leading to polymer self-assembling.
Keywords:
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