Infrared spectra of atactic poly-4-vinylpyridine

Панов, В. П.; Kazarin, L. A.; Dubrovin, V.I.; Гусев, В. В.; Kirsh, Yu. E.

doi:10.1007/bf00604430

Cited by 24 publications

(31 citation statements)

References 20 publications

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“…Their spectral feature closely resembles that of neat P4VP, suggesting that the spectra measured after the adsorption of Au nanoparticles are the authentic SERS spectra of P4VP on Au [33,34]. According to a theoretical calculation, the nonvalence interaction of the pyridine rings and CH 2 groups is negligibly weak [35]. Consequently, the normal modes of the pyridine rings and CH 2 groups can be considered separately to a good approximation, and the vibrations of the ring atoms can be classified in accordance with the C 2v point group.…”

Section: Resultsmentioning

confidence: 66%

Adsorption characteristics of Au nanoparticles onto poly(4-vinylpyridine) surface revealed by QCM, AFM, UV/vis, and Raman scattering spectroscopy

Kim

Ryoo

Lee

et al. 2010

Journal of Colloid and Interface Science

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Section: Resultsmentioning

confidence: 66%

Adsorption characteristics of Au nanoparticles onto poly(4-vinylpyridine) surface revealed by QCM, AFM, UV/vis, and Raman scattering spectroscopy

Kim

Ryoo

Lee

et al. 2010

Journal of Colloid and Interface Science

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“…Specifically,w ee xamined homochiral evolutionthroughthe self-assembly of stereoregularpolymers, as directed by the associated chiral dopants.T hisa pproach may provide an ew mechanismf or homochiral evolution through self-assembly,which is critical for keymolecularprocesses and relieso nadelicate balance between molecular and hierarchicalc hirality.Apreferential chain helicity can be inducedb y complexation withchiral HMA for homochiral evolutionfrom moleculart oc onformational chirality ( Figure 1). In the presence of HMA, the characteristic absorption band at 1590 cm À1 , resulting from the C À Ca nd C À Ns tretching vibrations in the pyridine rings of iP2VP, [5] broadened and shifted toward ah igher wavenumber (hypsochromic shift), thus indicating the association of iP2VP and HMA owing to acid-base complexation. Figure 2a shows the UV/Vis and CD spectra of iP2VP and the iP2VP/HMAcomplexinthe solution state.The absorption peak at 260 nm is ascribed to the p-p*t ransitiono ft he pyridine rings of iP2VP.Mirror-image CD spectra wereclearly identifiedf or the iP2VP/(S)-HMA and iP2VP/(R)-HMA complexes in 1,2-dichloroethane,w hereas iP2VP without achiral dopant was CD silent, thus suggesting ICD behavior of iP2VP.T his result indicates the association of HMA with the pyridyl groups of iP2VP.N ote that it is not possible to record the UV/Vis spectrum below 230 nm in solution owing to the cut-off effect of the solvent used.…”

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confidence: 60%

Controlled Handedness of Twisted Lamellae in Banded Spherulites of Isotactic Poly(2‐vinylpyridine) as Induced by Chiral Dopants

et al. 2015

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Herein, we suggest a unique approach to control the handedness of twisted lamellae in banded spherulites of a stereoregular polymer, isotactic poly(2-vinylpyridine) (iP2VP). When (R)- or (S)-hexahydromandelic acid (HMA), which can associate with iP2VP, was introduced as a chiral dopant, mirror-image CD spectra in the complex systems showed induced circular dichroism (ICD) of the iP2VP by chiral HMA. Banded spherulites resulting from lamellar twisting due to the imbalanced stresses at the opposite folding surfaces could be formed by crystallization of the iP2VP/HMA complexes, which had a crystalline structure similar to that of neat iP2VP. A preferential sense of the twisted crystalline lamellae was found in the iP2VP/HMA complex, thus suggesting homochiral evolution from conformational to hierarchical chirality.

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“…The broad feature at 3450 cm" 1 is due to water which was difficult to eliminate from the KBr pellet. The assignments for the major bands in this spectrum (Table II) are relatively straight-forward based on the assignments for polystyrene (_5), poly(4-vinylpyridine) (6), and substituted pyridines (7). The reflectance FTIR spectrum for the plasma polymerized film prepared under the conditions specified for Sample 1 in Table I is shown in Figure 3.…”

Section: Resultsmentioning

confidence: 99%

“…Chamber pressure was monitored with an MFCS Baratron Type 90H-1 capacitance manometer. The reactor was evacuated to less than 10" 6 Torr with a diffusion pump prior to introduction of monomer. During the actual deposition, a mechanical pump with an in-line liquid nitrogen cold trap was used to maintain monomer and carrier gas flow.…”

Section: Methodsmentioning

confidence: 99%

Fourier Transform Infrared Analysis of Plasma-Polymerized 2-Vinylpyridine Thin Films

Bieg

Ottesen

1979

ACS Symposium Series

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Polymer thin films deposited in an rf electrical discharge have been suggested for use as dielectric materials in electrical capacitors (1,2). As a preliminary step toward the study of the electrical and aging properties of thin film capacitors made from plasma polymerized 2-vinylpyridine, we have undertaken an investi gation of the chemical structure of these films deposited under a variety of plasma reactor conditions. Unfortunately, plasma polymerized organic films are difficult to analyze by conventional means, due primarily to their insoluble nature and availability as only milligram samples. In particular, conventional dispersive infrared transmission techniques have traditionally used artifi cially thick films on other than metallic substrates and have generally yielded poorly resolved spectra. We have found Fourier transform infrared spectroscopy (FTIR) to be a useful technique for the characterization of plasma polymerized 2-vinylpyridine thin films (1,000-40,000 Å) deposited on aluminum substrates. This technique has been used to observe variations in the chemical structure of poly(2-vinylpyridine) films as a function of reactor conditions (pressure, power, and carrier gas). Chemical and thermal behavior of these films was further investigated by elemental and thermogravimetric analyses. ExperimentalThe equipment used in this study (Figure 1) consisted of a capacitively-coupled plasma reactor similar to the apparatus described by Poulsen (3) for the plasma etching of integrated circuits. This arrangement resulted in uniform depositions over a range of flow rates and improved utilization of monomer. Monomer and carrier gas are introduced beneath the lower (ground) electrode and are forced to sweep radially inward across the 5 in. diameter aluminum electrodes. Ihe gases are pumped out through the tube in the center of the lower electrode. Substrates were mounted on the lower electrode. Electrode spacing was maintained at 2.3 cm. Power is supplied by an International Plasma Model 0-8412-0510-8/79/47-108-127$05.00/0

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Infrared spectra of atactic poly-4-vinylpyridine

Cited by 24 publications

References 20 publications

Adsorption characteristics of Au nanoparticles onto poly(4-vinylpyridine) surface revealed by QCM, AFM, UV/vis, and Raman scattering spectroscopy

Adsorption characteristics of Au nanoparticles onto poly(4-vinylpyridine) surface revealed by QCM, AFM, UV/vis, and Raman scattering spectroscopy

Controlled Handedness of Twisted Lamellae in Banded Spherulites of Isotactic Poly(2‐vinylpyridine) as Induced by Chiral Dopants

Fourier Transform Infrared Analysis of Plasma-Polymerized 2-Vinylpyridine Thin Films

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