The influence of the transition metals on the molecular orientation and molecule-substrate interaction has been investigated by angular dependent NEXAFS spectroscopy for the recently synthesised dialkynyl bridged complexes M-2-DEBP (Cl(PBu3)(2)M-C equivalent to C-C6H4[4 C6H4-C equivalent to CM(PBu3)(2)Cl, M = Pt, Pd; DEBP = diethynyl-biphenyl, i.e. C equivalent to C-C6H4-C6H4-C equivalent to C-). Thin films of both samples have been deposited on Au/Si(111), and the angular dependent analysis of the main pi* feature deriving by the superimposition of the resonances due to benzene and acetylene carbon orbitals showed a polarisation effect for Pd-2-DEBP only. A tendency to a preferential molecular orientation at nearly 50 degrees to the surface was calculated. Furthermore, for Pd2-DEBP, the two pi* resonances already assigned to benzene and acetylene carbon atoms showed different angular effects; a likely explanation for this behaviour bear in mind the interaction between sp and sp 2 carbons of the organic DEBP moieties with Pd centres of neighbouring macromolecules, giving rise to interchain interactions then leading to an enhancement of the already assessed self-assembling properties.
BATTOCCHIO C, FRATODDI I, RUSSO MV, CARRAVETTA V, MONTI S, IUCCI G, et al. (2007). Binuclear transition-metal complexes on gold: Molecular orientation by angular dependent NEXAFS spectroscopy. SURFACE SCIENCE, 601, 3943-3947 [10.1016/j.susc.2007.04.154].
Titolo: | Binuclear transition-metal complexes on gold: Molecular orientation by angular dependent NEXAFS spectroscopy | |
Autori: | ||
Data di pubblicazione: | 2007 | |
Rivista: | ||
Citazione: | BATTOCCHIO C, FRATODDI I, RUSSO MV, CARRAVETTA V, MONTI S, IUCCI G, et al. (2007). Binuclear transition-metal complexes on gold: Molecular orientation by angular dependent NEXAFS spectroscopy. SURFACE SCIENCE, 601, 3943-3947 [10.1016/j.susc.2007.04.154]. | |
Abstract: | The influence of the transition metals on the molecular orientation and molecule-substrate interaction has been investigated by angular dependent NEXAFS spectroscopy for the recently synthesised dialkynyl bridged complexes M-2-DEBP (Cl(PBu3)(2)M-C equivalent to C-C6H4[4 C6H4-C equivalent to CM(PBu3)(2)Cl, M = Pt, Pd; DEBP = diethynyl-biphenyl, i.e. C equivalent to C-C6H4-C6H4-C equivalent to C-). Thin films of both samples have been deposited on Au/Si(111), and the angular dependent analysis of the main pi* feature deriving by the superimposition of the resonances due to benzene and acetylene carbon orbitals showed a polarisation effect for Pd-2-DEBP only. A tendency to a preferential molecular orientation at nearly 50 degrees to the surface was calculated. Furthermore, for Pd2-DEBP, the two pi* resonances already assigned to benzene and acetylene carbon atoms showed different angular effects; a likely explanation for this behaviour bear in mind the interaction between sp and sp 2 carbons of the organic DEBP moieties with Pd centres of neighbouring macromolecules, giving rise to interchain interactions then leading to an enhancement of the already assessed self-assembling properties. | |
Handle: | http://hdl.handle.net/11590/147499 | |
Appare nelle tipologie: | 1.1 Articolo in rivista |