Electronic structure of octane on Cu(1 1 1) and Ni(1 1 1) studied by near edge X-ray absorption fine structure

Kiguchi, Manabu; Entani, Shiro; Ikeda, Susumu; Yoshikawa, Genki; Nakai, Ikuyo; Kondoh, Hiroshi; Ohta, Toshiaki; Saiki, Koichiro

doi:10.1016/j.susc.2007.04.055

Cited by 3 publications

(3 citation statements)

References 9 publications

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“…The elucidation of the origin of such a CH soft mode is important for understanding the interaction between alkanes and metal surfaces and the surface reaction on heterogeneous catalysts . The previous experimental results show that the center of the soft ν CH band of adsorbed cyclohexane on metal surfaces ranges from 2490 to 2775 cm −1 (Table ), depending on the metal substrate and crystal face.…”

Section: Vibrational Spectra Of Cyclohexane On Various Metal Surfacesmentioning

confidence: 98%

The Quantum Nature of C–H···Metal Interaction: Vibrational Spectra and Kinetic and Geometric Isotope Effects of Adsorbed Cyclohexane

Koitaya

Yoshinobu

2014

The Chemical Record

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The nature of C-H···M (M = metal surface) interactions is reviewed based mainly on our recent investigations of cyclohexane on Rh(111). Infrared reflection-absorption spectroscopy measurements at low temperature (∼20 K) have shown that the softened CH stretching band consists of several sharp peaks. At temperatures above 80 K, each peak is broadened, most probably by anharmonic coupling with thermally excited low-energy frustrated translational modes. The origin of fine structure in this band and its similarity to that in hydrogen bond systems are discussed. In addition, novel isotope effects were observed in desorption kinetics and adsorption geometry of cyclohexane on Rh(111) using temperature programmed desorption, ultraviolet photoelectron spectroscopy, and spot profile analysis low-energy electron diffraction. The desorption energy of deuterated cyclohexane (C6 D12 ) is lower than that of C6 H12 (inverse kinetic isotope effect). In addition, the work function change by adsorbed C6 D12 is smaller than that by adsorbed C6 H12 . These results indicate that C6 D12 molecules are slightly more distant from the surface than C6 H12 molecules (vertical geometric isotope effect). A lateral geometric isotope effect was also observed for the two-dimensional cyclohexane superstructures as a result of the repulsive interaction between interfacial dipoles (= work function change). These isotope effects are ascribed to the quantum nature of hydrogen involved in the C-H···M interaction.

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Section: Vibrational Spectra Of Cyclohexane On Various Metal Surfacesmentioning

confidence: 98%

The Quantum Nature of C–H···Metal Interaction: Vibrational Spectra and Kinetic and Geometric Isotope Effects of Adsorbed Cyclohexane

Koitaya

Yoshinobu

2014

The Chemical Record

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“…This apparent contradiction arises from the argument , that, in π-conjugated systems, the hybridization of the 3d metal’s d orbitals with the p orbitals of the atoms pointing across the interface promotes highly spin-polarized ISs. Although there are no π-electrons in alkanes, near edge X-ray absorption fine structure measurements on the alkane n -octane (C 8 H 18 ) deposited on Ni(111) and Cu(111) showed the presence of ISs close to the Fermi level . It is therefore possible to obtain ISs despite the fully saturated carbon bonds in the isolated molecule.…”

mentioning

confidence: 99%

“…Although there are no π-electrons in alkanes, near edge X-ray absorption fine structure measurements on the alkane n-octane (C 8 H 18 ) deposited on Ni(111) and Cu(111) showed the presence of ISs close to the Fermi level. 38 It is therefore possible to obtain ISs despite the fully saturated carbon bonds in the isolated molecule. We briefly consider the origin of these ISs.…”

mentioning

confidence: 99%

High Spin Polarization at Ferromagnetic Metal–Organic Interfaces: A Generic Property

Djeghloul

Gruber

Urbain

et al. 2016

J. Phys. Chem. Lett.

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A high spin polarization of states around the Fermi level, EF, at room temperature has been measured in the past at the interface between a few molecular candidates and the ferromagnetic metal Co. Is this promising property for spintronics limited to these candidates? Previous reports suggested that certain conditions, such as strong ferromagnetism, i.e., a fully occupied spin-up d band of the ferromagnet, or the presence of π bonds on the molecule, i.e., molecular conjugation, needed to be met. What rules govern the presence of this property? We have performed spin-resolved photoemission spectroscopy measurements on a variety of such interfaces. We find that this property is robust against changes to the molecule and ferromagnetic metal's electronic properties, including the aforementioned conditions. This affirms the generality of highly spin-polarized states at the interface between a ferromagnetic metal and a molecule and augurs bright prospects toward integrating these interfaces within organic spintronic devices.

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Structure and electronic structure of van der Waals interfaces at a Au(1 1 1) surface covered with a well-ordered molecular layer of n-alkanes

Mizushima

Koike

Kuroda

et al. 2021

Applied Surface Science

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Electronic structure of octane on Cu(1 1 1) and Ni(1 1 1) studied by near edge X-ray absorption fine structure

Cited by 3 publications

References 9 publications

The Quantum Nature of C–H···Metal Interaction: Vibrational Spectra and Kinetic and Geometric Isotope Effects of Adsorbed Cyclohexane

The Quantum Nature of C–H···Metal Interaction: Vibrational Spectra and Kinetic and Geometric Isotope Effects of Adsorbed Cyclohexane

High Spin Polarization at Ferromagnetic Metal–Organic Interfaces: A Generic Property

Structure and electronic structure of van der Waals interfaces at a Au(1 1 1) surface covered with a well-ordered molecular layer of n-alkanes

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