Electrochemical Shell-Isolated Nanoparticle-Enhanced Raman Spectroscopy: Bonding, Structure, and Ion-Pairing of the Positive Charge Bearing Pyridinium Ring Terminated Monolayer at Smooth Gold Electrode

2018 ◽  
Vol 122 (2) ◽  
pp. 1234-1242 ◽  
Author(s):  
Agnė Zdaniauskienė ◽  
Tatjana Charkova ◽  
Ieva Matulaitienė ◽  
Olegas Eicher-Lorka ◽  
Algirdas Matijoška ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Gold Electrode ◽  
Positive Charge ◽  
Ion Pairing ◽  
Bonding Structure ◽  
Pyridinium Ring

Thermodynamics of Protonation and Sodium Binding of Sulfate in Concentrated NaCl and CsCl Solutions Studied by Raman Spectroscopy

2000 ◽  
Vol 53 (5) ◽  
pp. 363 ◽  
Author(s):  
Steven Kratsis ◽  
Glenn Hefter ◽  
Peter M. May ◽  
Pal Sipos
Keyword(s):  
Raman Spectroscopy ◽  
Excellent Agreement ◽  
Thermodynamic Data ◽  
Association Constant ◽  
Protonation Constant ◽  
Ion Pairing ◽  
Ion Pair ◽  
Enthalpy And Entropy Changes ◽  
Enthalpy And Entropy ◽  
Sodium Binding

The protonation constant (pKa) of SO42–(aq) has been determined at ionic strengths 0.5 M ≤I ≤4.0 M in NaCl and CsCl media at 25˚C by using Raman spectroscopy. These data were used to calculate the association constant of the NaSO4–(aq) ion pair in CsCl media. The results are in excellent agreement with previous values obtained by other techniques. The (pKa) was also measured at I = 4 M in both media at temperatures up to 85˚C and the associated enthalpy and entropy changes were calculated. However, reliable thermodynamic data for the ion-pairing reaction could not be obtained at higher temperatures probably because of competition from CsSO4–(aq).

SERS of the Positive Charge Bearing Pyridinium Ring Terminated Self-Assembled Monolayers: Structure and Bonding Spectral Markers

2015 ◽  
Vol 119 (47) ◽  
pp. 26481-26492 ◽  
Author(s):  
Ieva Matulaitienė ◽  
Zenonas Kuodis ◽  
Algirdas Matijoška ◽  
Olegas Eicher-Lorka ◽  
Gediminas Niaura
Keyword(s):  
Positive Charge ◽  
Self Assembled Monolayers ◽  
Pyridinium Ring ◽  
Assembled Monolayers ◽  
Structure And Bonding ◽  
Self Assembled

scholarly journals The adsorption of thiophenol on gold – a spectroelectrochemical study

2015 ◽  
Vol 17 (33) ◽  
pp. 21364-21372 ◽  
Author(s):  
Rudolf Holze
Keyword(s):  
Raman Spectroscopy ◽  
Cyclic Voltammetry ◽  
Aqueous Solutions ◽  
Gold Electrode ◽  
Surface Enhanced Raman Spectroscopy ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Polycrystalline Gold

The adsorbate formed by adsorption of thiophenol on a polycrystalline gold electrode and brought into contact with aqueous solutions of 1 M HClO4and 0.1 M KClO4has been studied using cyclic voltammetry and surface-enhanced Raman spectroscopy.

Hexachlorotellurate(IV) hydrolysis equilibria in hydrochloric acid. Measurement by Raman and 125Te NMR spectroscopy and a reconsideration of earlier spectrophotometric results

1991 ◽  
Vol 69 (6) ◽  
pp. 987-992 ◽  
Author(s):  
J. B. Milne
Keyword(s):  
Raman Spectroscopy ◽  
Nmr Spectroscopy ◽  
Hydrochloric Acid ◽  
Key Words ◽  
Nmr Spectra ◽  
Ion Pairing ◽  
Hydrolysis Constant ◽  
Visible Spectrophotometry ◽  
Hydrolysis Constants ◽  
Uv Visible

Solutions of TeO2 (0.001 M) in HCl over a range of concentrations are shown to contain TeCl2(OH)2 in addition to TeCl62−and TeCl4(OH)−. The hydrolysis constants for TeCl62− and TeCl4(OH)− have been determined from a reconsideration of earlier UV-visible spectrophotometric results (1)[Formula: see text]The hydrolysis constants have also been determined by quantitative Raman spectroscopy (K1 = 2.21 (± 0.16) × 104 M3; K2 = 442 ± 57 M3). The agreement between K2 determined by the two methods is good but K1 from spectrophotometry is much larger than that from Raman studies. This disagreement is attributed to ion-pairing which will be significant at the concentration at which the Raman measurements were made (c(TeO2) = 0.50 M). The hydrolysis constant for TeCl62− was also determined from the 125Te NMR spectra of TeO2/HCl solutions, which consisted of one signal, indicating rapid Te exchange between all species. The hydrolysis constant, determined in this way (K1 = 1.92 (± 0.07) × 104 M3) was also low compared to that determined from spectrophotometry. Key words: solution, equilibria, tellurium, hydrochloric acid, Raman spectroscopy, 125Te NMR spectroscopy, UV–visible spectrophotometry.

Emitting Carbon Thin Films and Their Characterizations

1998 ◽  
Vol 509 ◽  
Author(s):  
Z. Li Tolt ◽  
R. L. Fink ◽  
Zvi Yaniv
Keyword(s):  
Thin Film ◽  
Raman Spectroscopy ◽  
Force Microscopy ◽  
Bonding Structure ◽  
Extraction Field ◽  
Site Density ◽  
Atomic Force ◽  
Uv Raman Spectroscopy ◽  
Uv Raman

AbstractCarbon thin film cathodes have been produced with an emission site density of 2 × 105/cm2 and with current density higher than 40 mA/cm2at 10 V/μm extraction field. Characterization of the film bonding structure by UV Raman spectroscopy and emission sites by Atomic Force Microscopy (AFM) are presented and discussed in detail. A hypothesis of the nature of emission sites in these films is proposed in accordance with the analyses.

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