Adsorption and reaction of 4‐methoxycinnamonitrile on a silver surface: A surface‐enhanced Raman spectroscopic study

Chun, Hyun Aee; Yi, Sun Shin; Kim, Myoung Soo; Kim, Kwan

doi:10.1002/jrs.1250211107

Cited by 14 publications

(9 citation statements)

References 36 publications

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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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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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“…Our group has extended the study to formic, acetic, propionic, butyric and acrylic acids and some of their derivatives and it was found that some of them show systematically what we called an anomalous SERS spectrum, independently of the nature of the adsorbate. 18,19 In this respect, many SERS studies have shown chemical transformations such as polymerizations, 6,20 isomerizations, 21 photodecompositions 22 and even hydrolysis reactions. 23 The aforementioned studies were conducted from the point of view of the electromagnetic enhancement mechanism (EM), which allows us to derive the orientation of the adsorbate on the basis of the relevant selection rules.…”

Section: Introductionmentioning

confidence: 99%

Surface‐enhanced Raman scattering of 3‐phenylpropionic acid (hydrocinnamic acid)

Castro

Ramírez

López‐Tocón

et al. 2002

J Raman Spectroscopy

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Raman and surface-enhanced Raman scattering (SERS) spectra of 3-phenylpropionic acid on silver colloids at several concentrations and pH values were recorded. The analysis of the spectra indicated that 3-phenylpropionic acid links to the metal through its carboxylate group, keeping the aromatic ring almost perpendicular to the surface. Moreover, the acid undergoes an a, b-dehydrogenation in some extension in such a way that the recorded SERS is the result of the competitive adsorption of 3-phenylpropionic and trans-cinnamic acids. Likewise, the contribution of the charge-transfer mechanism to the enhancement of the SERS of 3-phenylpropionic acid was estimated, making evident its important participation in the enhancement of modes 6a, 9a and 8a.

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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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Adsorption and reaction of 4‐methoxycinnamonitrile on a silver surface: A surface‐enhanced Raman spectroscopic study

Cited by 14 publications

References 36 publications

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

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

Surface‐enhanced Raman scattering of 3‐phenylpropionic acid (hydrocinnamic acid)

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

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