Raman spectra of metastable phase of benzophenone

Babkov, L. M.; Baran, J.; Davydova, N. A.; Mel'nik, V. I.; Uspenskiy, K. E.

doi:10.1016/j.molstruc.2005.12.050

Cited by 16 publications

(9 citation statements)

References 11 publications

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“…, it can be attributed to the same kind of vibrational mode reported in benzophenone[28,29]. On the other hands, some Raman modes at 46, 68 and 97 cm-1 which have been observed only in ketoprofen probably originate from the presence of carboxylic acid group.…”

supporting

confidence: 68%

Glass transition dynamics of anti-inflammatory ketoprofen studied by Raman scattering and terahertz time-domain spectroscopy

Shibata

Igawa

Kim

et al. 2014

Journal of Molecular Structure

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A liquid-glass transition and a crystalline state of pharmaceutical racemic ketoprofen were studied by Raman scattering and the broadband terahertz time-domain spectroscopy (THz-TDS) in the frequency range from 9 to 260 cm-1. The low-frequency Raman scattering spectra clearly shows the remarkable change related to a liquid-glass transition at about T g = 267 K. After melt-quenching at liquid nitrogen temperature, a boson peak appears at about 16.5 cm-1 near and below T g and the intensity of quasi-elastic scattering related to structural relaxation increases markedly on heating. The crystalline racemic ketoprofen of "conformer A" shows the noncoincidence of mode frequencies below 200 cm-1 between Raman scattering spectrum and imaginary part of dielectric spectrum observed by THz-TDS.

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supporting

confidence: 68%

Glass transition dynamics of anti-inflammatory ketoprofen studied by Raman scattering and terahertz time-domain spectroscopy

Shibata

Igawa

Kim

et al. 2014

Journal of Molecular Structure

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“…In particular, the BP with its phenyl rings showed multiple distinct Raman peaks. The strongest peaks were found at approximately 997, 1149, 1592, 1648, and 3062 cm -1 and are assigned to the in-plane deformation 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 vibration of the phenyl ring, the stretching vibration of C-C-C, the phenyl ring stretching mode of C=C and C-C, a stretching mode of the carbonyl group C=O, and the C-H stretching vibration, respectively [24][25][26] . The most intense Raman bands in the homopolymer PDMAA spectra are found at approximately 1416, 1448, 1619, and 2934 cm -1 and correspond to the symmetric and asymmetric bending modes of methyl groups (CH 3 ), the vinyl stretching mode (C=C), and the C-H symmetric stretching mode of methyl groups, respectively 27,28 .…”

Section: Characterization Of Polymer-modified Paper Hand Sheets By Comentioning

confidence: 99%

Cross-Linking Cellulosic Fibers with Photoreactive Polymers: Visualization with Confocal Raman and Fluorescence Microscopy

et al. 2015

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The properties of paper sheets can be tuned by adjusting the surface or bulk chemistry using functional polymers that are applied during (online) or after (offline) papermaking processes. In particular, polymers are widely used to enhance the mechanical strength of the wet state of paper sheets. However, the mechanical strength depends not only on the chemical nature of the polymeric additives but also on the distribution of the polymer on and in the lignocellulosic paper. Here, we analyze the photochemical attachment and distribution of hydrophilic polydimethylacrylamide-co-methacrylate-benzophenone P(DMAA-co-MABP) copolymers with defined amounts of photoreactive benzophenone moieties in model paper sheets. Raman microscopy was used for the unambiguous identification of P(DMAA-co-MABP) and cellulose specific bands and thus the copolymer distribution within the cellulose matrix. Two-dimensional Raman spectral maps at the intersections of overlapping cellulose fibers document that the macromolecules only partially surround the cellulose fibers, favor to attach to the fiber surface, and connect the cellulose fibers at crossings. Moreover, the copolymer appears to accumulate preferentially in holes, vacancies, and dips on the cellulose fiber surface. Correlative brightfield, Raman, and confocal laser scanning microscopy finally reveal a reticular three-dimensional distribution of the polymer and show that the polymer is predominately deposited in regions of high capillarity (i.e., in proximity to fine cellulose fibrils). These data provide deeper insights into the effects of paper functionalization with a copolymer and aid in understanding how these agents ultimately influence the local and overall properties of paper.

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“…Next, vibration at 1149 cm −1 (II) is the stretching one from C A -C-C B between two phenyl rings. The mode at 1596 cm −1 (III) corresponds to the phenyl ring C-C stretching vibrations [45]. In case of mats made of pure PVP aqueous suspensions, the ring vibration was observed at 931 cm −1 (IV).…”

Section: Resultsmentioning

confidence: 98%

“…To do so, we used a standard crosslinking molecule from the diarylketones family: a benzophenone [44]. The ability of BP molecules to become cross-linkers under UV light (λ = 365 nm) [28] and their low melting temperature of 48.5°C [45], present a facile route for the preparation of crosslinked PVP mats more stable in aqueous environments for longer period of time than that of pure PVP electrospun fibres. Therefore, we have then dispersed highly concentrated (1.2 mg/µL) benzophenone (BP) in aqueous PVP solution (PVP-BP) at 50°C…”

Section: Resultsmentioning

confidence: 99%

UV cross-linked polyvinylpyrrolidone electrospun fibres as antibacterial surfaces

Maciejewska

Wychowaniec

Woźniak-Budych

et al. 2019

Science and Technology of Advanced Materials

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Many bacteria become progressively more resistant to antibiotics and it remains a challenging task to control their overall levels. Polymers combined with active biomolecules come to the forefront for the design of antibacterial materials that can address this encounter. In this work, we investigated the photo-crosslinking approach of UV-sensitive benzophenone molecule (BP) with polyvinylpyrrolidone (PVP) polymer within electrospun fibres. The BP and PVP solutions allowed fabricating polymer mats that were subsequently functionalised with antibacterial lysozyme. The physical properties of the crosslinked electrospun fibres were investigated by scanning electron microscopy and atomic force microscopy. The average diameter of the obtained fibres decreased from 290 ± 50 nm to 270 ± 70 nm upon the addition of the crosslinking molecules and then to 240 ± 80 nm and 180 ± 90 nm after subsequent crosslinking reaction at an increasing time: 3 and 5 h, respectively. The peak force quantitative nanomechanical mapping (PF-QNM) indicated the increase of DMT modulus of obtained cross-linked fibres from 4.1 ± 0.8 GPa to 7.2 ± 0.5 GPa. Furthermore, the successful crosslinking reaction of PVP and BP solution into hydrogels was investigated in terms of examining photo-crosslinking mechanism and was confirmed by rheology, Raman, Fourier transform infrared and nuclear magnetic resonance. Finally, lysozyme was successfully encapsulated within cross-linked PVP-BP hydrogels and these were successfully electrospun into mats which were found to be as effective antibacterial agents as pure lysozyme molecules. The dissolution rate of photo cross-linked PVP mats was observed to increase in comparison to pure PVP electrospun mats which opened a potential route for their use as antibacterial, on-demand, dissolvable coatings for various biomedical applications.

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Raman spectra of metastable phase of benzophenone

Cited by 16 publications

References 11 publications

Glass transition dynamics of anti-inflammatory ketoprofen studied by Raman scattering and terahertz time-domain spectroscopy

Glass transition dynamics of anti-inflammatory ketoprofen studied by Raman scattering and terahertz time-domain spectroscopy

Cross-Linking Cellulosic Fibers with Photoreactive Polymers: Visualization with Confocal Raman and Fluorescence Microscopy

UV cross-linked polyvinylpyrrolidone electrospun fibres as antibacterial surfaces

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