Intermolecular interactions in solutions of some amino-nitro-benzene derivatives, studied by spectral means

Dorohoi, Dana Ortansa; Airinei, Anton; Dimitriu, Mihaela

doi:10.1016/j.saa.2009.02.011

Cited by 15 publications

(4 citation statements)

References 13 publications

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“…For the colored films, the dichroic ratio, D , was estimated by using Equation (3): [ 47 ]

D = \frac{A_{italicrel, p} - A_{italicrel, n}}{A_{italicrel, p} + A_{italicrel, n}} .

…”

Section: Methodsmentioning

confidence: 99%

“…The orientation degree, g , of the spectrally active molecules embedded in the PVOH films, resulted after stretching (under mild heating), is defined by Equation (4): [ 37, 47 ]

g = \frac{C_{0}}{C} = \frac{2 D}{3 - D} .

In Equation (4), C and C 0 are the total solute concentrations, respectively, the concentration of the solute molecules oriented along the stretching direction of the PVOH host.…”

Section: Methodsmentioning

confidence: 99%

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Effect of mechanical treatments on orientation behavior and spectral properties of azoderivative dyes incorporated in poly(vinyl alcohol) films

Albu¹,

Stoica²,

Barzic³

et al. 2021

Polymer Engineering & Sci

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Various azoderivative dyes were incorporated in uncolored poly(vinyl alcohol) (PVOH). One type of film was obtained by drying the layer of solution cast on glass plate. The other type was obtained by rubbing the PVOH layer before complete drying. Linear birefringence and dichroism of dyed polymer films were investigated as a function of stretching degree. An increase in the linear birefringence was found with increasing stretching degree for both uncolored and colored films. Dichroism of the PVOH films depends on the dye chemical structure and also on the stretching degree of both non‐rubbed and rubbed and dyed PVOH samples. Molecular modeling was used to examine interactions occurring between PVOH and the embedded dye molecule. These stretching degree dependencies were approximated mathematically, which was used to describe the behavior of some components of interference filters.

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“…For the colored films, the dichroic ratio, D , was estimated by using Equation (3): [ 47 ]

D = \frac{A_{italicrel, p} - A_{italicrel, n}}{A_{italicrel, p} + A_{italicrel, n}} .

…”

Section: Methodsmentioning

confidence: 99%

“…The orientation degree, g , of the spectrally active molecules embedded in the PVOH films, resulted after stretching (under mild heating), is defined by Equation (4): [ 37, 47 ]

g = \frac{C_{0}}{C} = \frac{2 D}{3 - D} .

In Equation (4), C and C 0 are the total solute concentrations, respectively, the concentration of the solute molecules oriented along the stretching direction of the PVOH host.…”

Section: Methodsmentioning

confidence: 99%

Effect of mechanical treatments on orientation behavior and spectral properties of azoderivative dyes incorporated in poly(vinyl alcohol) films

Albu¹,

Stoica²,

Barzic³

et al. 2021

Polymer Engineering & Sci

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show abstract

“…3D-FDTD electrodynamics simulation was carried out using the FDTD SOLUTIONS software (version 7.0.1) provided by Lumerical Solutions, Inc. A nanostructure composed of a Au (or Au/Ag or Ag) nanoparticle and a flat Au surface was modeled as a single metal sphere (35 nm) laid on a cuboid Au substrate with dimensions of 400 nm × 400 nm × 150 nm. The dielectric constants of Au and Ag were taken from the report of Palik, and those of Au/Ag alloy nanoparticles were given by the composition-weighted average of Au and Ag. , The dielectric film between the sphere and the cuboid was fixed to be 1 nm, and the refractive index of it was taken to be constant at 1.5. − Different mesh sizes were used for each calculation. Small mesh size (0.25 nm) was employed at the gap site between the sphere and the cuboid, while the mesh grid size of 1 nm was adopted around the surrounding region.…”

Section: Experimental Sectionmentioning

confidence: 99%

Enhanced Raman Scattering in Gaps Formed by Planar Au and Au/Ag Alloy Nanoparticles

2013

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In this study, the Raman spectral characteristics of 1,4-phenylenediisocyanide (1,4-PDI) and 4-aminobenzenethiol (4-ABT) positioned at the nanogap formed by Au/Ag alloy nanoparticles and a flat Au substrate were examined, and three-dimensional finite-difference time-domain (3-D FDTD) calculations were carried out. A more intense Raman signal was measured, regardless of the excitation wavelength, when Ag-rich Au/Ag alloy nanoparticles were used to form the nanogaps. Regarding the excitation wavelength, 568 nm of light was the most effective in inducing a Raman signal, particularly when Ag nanoparticles were adsorbed on 1,4-PDI or 4-ABT, whereas 632.8 nm of light was slightly more effective than 568 nm of light when Au nanoparticles were adsorbed onto them. The Raman spectra of 1,4-PDI could be attributed to the electromagnetic enhancement mechanism. The dependencies of the Raman spectra of 1,4-PDI on the excitation wavelength and the type of Au/Ag alloy nanoparticle were comparable to those predicted by the 3-D FDTD calculations. From the measured NC stretching frequencies, the surface of 35 nm sized Au/Ag alloy nanoparticles containing more than 5 mol % of Ag atoms was concluded to be covered fully with Ag atoms. The Raman spectra of 4-ABT were interpreted to be a product of electromagnetic and chemical enhancement mechanisms. Assuming that the Raman intensity ratios of the b 2 -and a 1 -type bands were indicative of the extent of chemical enhancement, the Ag-to-4-ABT electron transfer appeared more facile than the Au-to-4-ABT transfer did and more favorable by excitation with a 514.5 nm laser than a 568 nm or 632.8 nm laser.

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“…54 The role of Solvatochromic parameters, such as a, b, DN and AN in the above equations have been studied in the mechanism of the interactions between probe and solvent. [55][56][57] Supplementary data CCDC 737100 and 737099 contain the supplementary crystallographic data for compounds 1 and 2 of this paper, respectively. These data can be obtained free of charge via www.ccdc.cam.ac.uk/conts/retrieving.html (or from the Cambridge Crystallographic Data Centre, 12, Union Road, Cambridge CB2 1EZ, UK; fax: +44 1223 336033).…”

Section: Methods Of Calculationmentioning

confidence: 99%

Synthesis, Structure and Solvatochromism Studies on Copper(II) Complexes Containing Ethylenediamine, Pyridine and Imidazol Ligands

Golchoubian¹,

Nazari²,

Kariuki³

2011

J Chinese Chemical Soc

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Intermolecular interactions in solutions of some amino-nitro-benzene derivatives, studied by spectral means

Cited by 15 publications

References 13 publications

Effect of mechanical treatments on orientation behavior and spectral properties of azoderivative dyes incorporated in poly(vinyl alcohol) films

Effect of mechanical treatments on orientation behavior and spectral properties of azoderivative dyes incorporated in poly(vinyl alcohol) films

Enhanced Raman Scattering in Gaps Formed by Planar Au and Au/Ag Alloy Nanoparticles

Synthesis, Structure and Solvatochromism Studies on Copper(II) Complexes Containing Ethylenediamine, Pyridine and Imidazol Ligands

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