Infrared and ultrasonic spectra of sodium thiocyanate and lithium thiocyanate in tetrahydrofuran

Saar, David; Petrucci, Sergio

doi:10.1021/j100406a006

Cited by 36 publications

(24 citation statements)

References 2 publications

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“…The lines are sharp and intense, which allow us to identify typical lines of thiocyanate in a AuNP–SCN sample such as the narrow line at 2069 cm −1 , attributed to stretching of CN mode (ν(CN)), as well as 1620 cm −1 (probably a superposition with the carboxylic contribution) and the weak lines at 950 and 752 cm −1 . 49–51 Similarly, in AuNP–S we attribute the narrow line at 1120 cm −1 to sulfate mode, 52 the line centered at 668 cm −1 to antisymmetric stretch of C–S bound, and the line at 1107 cm −1 to a stretch of S–O vibration mode 53,54 as well as lines such as 870 and 967 cm −1 to a rocking mode of some CH group. 54…”

Section: Resultsmentioning

confidence: 66%

Probing the Sulfur-Modified Capping Layer of Gold Nanoparticles Using Surface Enhanced Raman Spectroscopy (SERS) Effects

et al. 2017

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Gold nanoparticles (AuNP) exhibit particular plasmonic properties when stimulated by visible light, which makes them a promising tool to many applications in sensor technology and biomedical applications, especially when associated to sulfur-based compounds. Sulfur species form a great variety of self-assembled structures that cap AuNP and this interaction rules the optical and plasmonic properties of the system. Here, we report the behavior of citrate-stabilized gold nanospheres in two distinct sulfur colloidal solutions, namely, thiocyanate and sulfide ionic solutions. Citrate-capped gold nanospheres were characterized using ultraviolet-visible (UV-Vis) absorption, transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), and atomic force microscopy (AFM). In the presence of sulfur species, we have observed the formation of NP clusters and chain-like structures, giving rise to surface-enhanced effects. Surface-enhanced Raman spectroscopy (SERS) pointed to a modification in citrate vibrational modes, which suggests substitution of citrate by either thiocyanate or sulfide ions with distinct dynamics, as showed by in situ fluorescence. Moreover, we report the emergence of surface-enhanced infrared absorption (SEIRA) effect, which corroborates SERS conclusions. Further, SEIRA shows a great potential as a tool for specification of sulfur compounds in colloidal solutions, which is particularly useful when dealing with sensor technology.

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Section: Resultsmentioning

confidence: 66%

Probing the Sulfur-Modified Capping Layer of Gold Nanoparticles Using Surface Enhanced Raman Spectroscopy (SERS) Effects

et al. 2017

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“…The lower frequency NaSCN band is due to the contact ion pair dimer, and the higher frequency band is attributed to the contact ion pair monomer. 28,29 At an even higher frequency, an ion triple is present in the mixture but is not within the bandwidth of our experiment and so is not present in the 2DIR spectra.…”

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confidence: 51%

“…The first is the diagonal peak belonging to the totally symmetric A′(1) stretching band of the ReCl, and the second is the cross peak corresponding to exciting ReCl followed by energy transfer to NaSCN. The lower frequency NaSCN band is due to the contact ion pair dimer, and the higher frequency band is attributed to the contact ion pair monomer. , At an even higher frequency, an ion triple is present in the mixture but is not within the bandwidth of our experiment and so is not present in the 2DIR spectra.…”

mentioning

confidence: 52%

NOESY-Like 2D-IR Spectroscopy Reveals Non-Gaussian Dynamics

Kiefer

Kubarych

2016

J. Phys. Chem. Lett.

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We have identified an unexpected signature of non-Gaussian dynamics in a conventional 2D IR measurement on a system with rapid intermolecular vibrational energy transfer. In a ternary mixture of the CO reduction photocatalyst, ReCl(bpy)(CO), NaSCN, and THF solvent, preferential association between the metal carbonyl catalyst and the NaSCN ion pairs facilitates intermolecular energy transfer on a few picoseconds time scale. Monitoring the cross peak between the highest frequency metal carbonyl band and the CN bands of NaSCN contact ion pairs, we find a striking time evolution of the cross-peak position on the detection axis. This frequency shift, which is due to spectral diffusion following intermolecular energy transfer, occurs with a time scale that is distinct from either the donor or acceptor spectral diffusion measured simultaneously. We argue that the energy transfer, a second-order Förster process, effectively increases the dimensionality of the 2D-IR spectroscopy and thus enables sensitivity to non-Gaussian dynamics.

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“…1982, 30, 61. (7) Conway, B. E. Ionic Hydration in Chemistry and Physics; Elsevier: Amsterdam, 1981. (8) Buckingham, A. D. Discuss.…”

Section: Introductionmentioning

confidence: 99%

Calculation of Gibbs hydration energy with the ion-dielectric sphere model

Frese¹

1989

J. Phys. Chem.

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The Gibbs energy of hydration of gaseous ions of-1 to +4 charge is calculated on the basis of the exact electrostatic solution for the interaction energy of an ion and groups of dielectric spheres. Dispersion energies were added. The average error of the method is 2%. The dielectric constant of the spheres is assumed to be described by Booth's field-dependent version of Kirkwood's theory. The energetic contributions of successive layers of water are obtained by demanding a self-consistent dielectric constant at each shell of water. The results confirm that 78-90% of the hydration energy, depending on the ion, involves water in the inner layer. The accuracy of the Born expression for solvated complex ions, M(H20)"+',~, is in doubt. Inner-layer hydration numbers ranging from 4 to 12 were obtained.

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Infrared and ultrasonic spectra of sodium thiocyanate and lithium thiocyanate in tetrahydrofuran

Cited by 36 publications

References 2 publications

Probing the Sulfur-Modified Capping Layer of Gold Nanoparticles Using Surface Enhanced Raman Spectroscopy (SERS) Effects

Probing the Sulfur-Modified Capping Layer of Gold Nanoparticles Using Surface Enhanced Raman Spectroscopy (SERS) Effects

NOESY-Like 2D-IR Spectroscopy Reveals Non-Gaussian Dynamics

Calculation of Gibbs hydration energy with the ion-dielectric sphere model

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