Determination of alcohol solvent orientation and bonding at silver electrodes using surface-enhanced Raman scattering: methanol, ethanol, 1-propanol, and 1-pentanol

Sobocinski, Raymond L.; Pemberton, Jeanne E.

doi:10.1021/la00044a028

Cited by 26 publications

(21 citation statements)

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“…The methyl stretching bands for 1-propanol are at 2878 cm -1 (symmetric) and 2964 cm -1 (asymmetric); the corresponding vibrations for methanol can be found at 2835 cm -1 and 2941 cm -1 (see Figure 2, middle, marked yellow). 44 In comparing the positions of these Raman signals with the Raman spectra of pure 1-propanol and methanol only the asymmetric methyl stretch band of methanol is shifted to larger wave number 2945 cm -1 (see Figure 2, bottom right, 45 At this time, the X-ray patterns exhibit no reflexes. After the start of the crystallization, first reflexes of the polymorphs appear (10.20 min and 18.40 min) increasing in intensity.…”

Section: Resultsmentioning

confidence: 95%

Direct evidence of polyamorphism in paracetamol

2015

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While polymorphism is a common phenomenon in the crystallization processes of organic compounds, polyamorphism has gained importance only recently. Using sophisticated sample environments and applying in situ scattering methods and vibrational spectroscopy, the complete crystallization process of organic compounds from solution can be traced and characterized. Diffuse scattering from amorphous intermediates can be investigated by analyzing the atomic pair distribution function (PDF) to gain further insights into molecular pre-orientation. The crystallization behavior of paracetamol was studied exemplarily under defined, surface-free conditions. Based on the choice of the solvent, the formation of different polymorphs is promoted. The thermodynamically stable form I and the metastable orthorhombic form II could be isolated in pure form directly from solution. For both polymorphs, the crystallization from solution proceeds via a distinct amorphous precursor phase. PDF analyses of these different amorphous states indicate a specific pre-orientation of the analyte molecules introduced by the solvent. The resulting crystalline polymorph is already imprinted in these proto-crystalline precursors. Direct experimental evidence for the polyamorphism of paracetamol is provided.

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Section: Resultsmentioning

confidence: 95%

Direct evidence of polyamorphism in paracetamol

2015

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“…These highly mobile adsorbates, present at relatively low levels, align with their alkyl chains along the surface. Agostic bonds [80] and solvophobic interactions promote this process. Stage 2 begins with the nucleation of small, ordered domains, driven by van der Waals interactions between neighboring adsorbates.…”

Section: Introductionmentioning

confidence: 99%

Importance of reactant mass transfer in the reproducible preparation of self-assembled monolayers

Edwards

Bergren

Cox

et al. 2008

Journal of Electroanalytical Chemistry

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“…The potentials at which this second feature are observed suggest that it is due to solvent reorientation at the electrode surface,13 a notion which is supported by the surface Raman scattering behavior of these alcohols. 1,4,6,8 The resulting values of Br~surface coverage as a function of potential determined from a HurwitzÈParsons analysis11h13 of these data are shown in Figs. 1b, d, f, h and j.…”

Section: Electrochemistrymentioning

confidence: 99%

Electrochemical and surface enhanced Raman scattering studies of bromide ion adsorption at silver electrodes in a series of normal alcohols

Pemberton¹,

Shen

1999

Phys. Chem. Chem. Phys.

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Br~surface coverage as a function of electrode potential is quantitatively determined using the HurwitzÈParsons analysis of di †erential capacitance data at Ag electrodes in the series of normal alcohols, methanol through pentanol, containing LiBr. Values for the potential of zero charge (pzc) are estimated from these data. Surface-enhanced Raman spectroscopy (SERS) data in the l(AgÈBr) region show the presence of a l(AgÈBr) feature at potentials positive of the pzc which supports strong speciÐc adsorption of Br~in these media. An excellent correlation between the SERS intensity and the Br~surface coverage determined from di †erential capacitance is observed. Bands attributed to hindered translational modes of trace interfacial water are also observed.

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Determination of alcohol solvent orientation and bonding at silver electrodes using surface-enhanced Raman scattering: methanol, ethanol, 1-propanol, and 1-pentanol

Cited by 26 publications

References 0 publications

Direct evidence of polyamorphism in paracetamol

Direct evidence of polyamorphism in paracetamol

Importance of reactant mass transfer in the reproducible preparation of self-assembled monolayers

Electrochemical and surface enhanced Raman scattering studies of bromide ion adsorption at silver electrodes in a series of normal alcohols

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