Surface-enhanced Raman spectroscopic study of hydrocinnamonitrile adsorbed on silver surface

Chun, Hyun Aee; Kim, Myoung Soo; Kim, Kwan

doi:10.1016/0022-2860(89)85106-3

Cited by 19 publications

(5 citation statements)

References 36 publications

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“…The blue shifts of the ν(CN) band were explained in coordination chemistry by invoking the fact that the nitrogen lone pair electrons have antibonding character and the electron donation to the metal surfaces may increase the strength of the CN bond . In our previous SERS studies, − however, such blue shifts on a silver sol surface were mainly ascribed to the disruption of conjugation induced by the π coordination of the nitrile group to metals. Yet it seems a matter of conjecture to dictate the exact adsorption mechanism from our SERS spectra.…”

Section: Resultsmentioning

confidence: 80%

“…Adsorption of nitriles on metal substrates has attracted much interest due to its potential applications in many areas including liquid crystal thin films , and molecular electronics. , In organometallic chemistry, nitriles are generally known to have a σ-type coordination to metal atoms via the nitrogen lone-pair electrons. , Our compiled spectroscopic data − have lead to a conclusion that a majority of aromatic nitriles were adsorbed on silver surface via a C⋮N π system.…”

Section: Introductionmentioning

confidence: 95%

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Surface-Enhanced Raman Scattering of 4-Cyanobiphenyl on Gold and Silver Nanoparticle Surfaces

et al. 2002

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The adsorption behavior of 4-cyanobiphenyl (CNBP) has been investigated by means of surface-enhanced Raman scattering (SERS). CNBP appeared to assume a tilted orientation on silver and gold. The presence of the ring C-H band denoted a rather vertical orientation of the biphenyl ring on Ag and Au. On the other hand, considerable red shifts of the ring-breathing modes with the increase in their bandwidths indicated a substantial π-type interaction between the benzene rings and metal substrates. On gold, the concentrationdependent SERS experiment showed CNBP to have a slightly perpendicular stance at its high surface coverage. The presence of the BH4ion in sols was found to affect the adsorption reaction and surface orientation of CNBP. The spectral band analysis based on electromagnetic selection rule indicated that CNBP should have a slightly more vertical orientation on gold than on silver at the concentration of ∼10 -4 M.

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Section: Resultsmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 95%

Surface-Enhanced Raman Scattering of 4-Cyanobiphenyl on Gold and Silver Nanoparticle Surfaces

et al. 2002

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“…Comparison with Nitriles. In organometallic chemistry, nitriles are generally known to have a σ-type coordination to metal atoms via the nitrogen lone-pair electrons. , The compiled SERS data ,− of various aromatic nitriles, however, have led a conclusion that a majority of aromatic nitriles were adsorbed on the silver surface via C⋮N π system by referring to the spectral shifts of the ν(CN) bands.…”

Section: Resultsmentioning

confidence: 99%

Adsorption of 4-Biphenylisocyanide on Gold and Silver Nanoparticle Surfaces: Surface-Enhanced Raman Scattering Study

et al. 2002

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The adsorption behavior of 4-biphenylisocyanide (BPNC) has been studied by means of surface-enhanced Raman scattering (SERS). BPNC has been found to adsorb on silver and gold via the carbon lone pair electrons assuming a standing geometry with respect to the surfaces. The presence of the ν(CH) band in the SERS spectra indicated a vertical orientation of the biphenyl ring of BPNC on Ag and Au. Neither a substantial red shift nor a significant band broadening of the ring breathing modes implied that a direct ring π orbital interaction with metal substrates should be quite low. On the basis of the electromagnetic surface selection rule, we attempted to explain the orientation of the adsorbate on Ag and Au surface by determining the relative enhancement factor of each vibrational band. The band analysis indicated that BPNC should have a slightly more vertical orientation on silver than on gold. The frequency of the ν(NC) band on gold increased by ∼10 cm -1 than that on silver surface. Such a higher blue shift of the ν(NC) stretching vibration in the gold sol SER spectrum may be due to a higher electronegativity of gold.

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“…The chemistry of metal−nitrile complexes has attracted much attention in view of the fact that the −C⋮N: group is isoelectronic with molecular nitrogen and that organonitrile complexes can serve as convenient precursors for a wide variety of coordination complexes . In organometallic chemistry, nitriles are generally known to coordinate to metal atoms via the nitrogen lone-pair electrons. , In our previous surface-enhanced Raman scattering (SERS) studies of various nitriles in silver sols, a majority of aromatic nitriles were found, however, to adsorb via the C⋮N π system rather than the nitrogen lone-pair electrons. − Thereby, for 1,4-dicyanobenzene (1,4-DCB), both of the nitrile groups seemed to interact effectively with the silver surface via their π systems, assuming a flat molecular orientation with respect to the surface.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of 1,4-Phenylene Diisocyanide on Silver Investigated by Infrared and Raman Spectroscopy

Han

Joo

et al. 1999

Langmuir

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The adsorption characteristics of 1,4-phenylene diisocyanide (1,4-PDI) on silver have been investigated by means of infrared and Raman spectroscopy. Specifically, in the infrared spectroscopic study, we have employed three different sampling methods, i.e., reflection-absorption infrared (RAIR), surface-enhanced infrared (SEIR), and diffuse reflectance Fourier transform (DRIFT) spectroscopy. The SEIR and DRIFT spectral features of 1,4-PDI assembled, respectively, on vacuum-evaporated thin Ag film and 2-µm-size Ag powders were both consonant with the RAIR spectral features observed on vacuum-evaporated thick Ag film, implying that the usual infrared surface selection rule was applicable even to SEIR and DRIFT spectroscopy. All three kinds of infrared spectral data clearly dictated that 1,4-PDI should be adsorbed on silver via the carbon lone-pair electrons of one isocyanide group assuming a vertical orientation with respect to the silver substrate. We could also obtain the surface-enhanced Raman (SER) spectrum of 1,4-PDI adsorbed on powdered silver that was used in the DRIFT spectroscopic study. Although an unequivocal SER selection rule has not yet been established, the same conclusion as that from the infrared data could be derived from the peak shift, band broadening, as well as from the presence of the ring C-H stretching band in the SER spectrum.

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Surface-enhanced Raman spectroscopic study of hydrocinnamonitrile adsorbed on silver surface

Cited by 19 publications

References 36 publications

Surface-Enhanced Raman Scattering of 4-Cyanobiphenyl on Gold and Silver Nanoparticle Surfaces

Surface-Enhanced Raman Scattering of 4-Cyanobiphenyl on Gold and Silver Nanoparticle Surfaces

Adsorption of 4-Biphenylisocyanide on Gold and Silver Nanoparticle Surfaces: Surface-Enhanced Raman Scattering Study

Adsorption of 1,4-Phenylene Diisocyanide on Silver Investigated by Infrared and Raman Spectroscopy

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