FT Raman and FT–IR spectral studies of 3-mercapto-1,2,4-triazole

Krishnakumar, V.; Xavier, R. John

doi:10.1016/s1386-1425(03)00281-6

Cited by 152 publications

(74 citation statements)

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“…2) displayed two relevant changes, as compared to its precursor (3); a band at 830 cm −1 , characteristic of N-C N in plane bending (Krishnakumar & John Xavier, 2004), arising from formation of the triazole ring; additional evidence of the occurrence of the azide-alkyne coupling was provided by the disappearance of the typical monosubstituted alkyne vibration modes at 3291 cm −1 ( C-H stretching) and 2122 cm −1 (C C stretching). Given the structural nature of the azide used in the cycloaddition, i.e., of its 3,6,9-trioxaundecan-1-amine backbone, all additional vibration modes from this backbone were expectedly overlapped to similar modes already present on the precursor polymeric matrix.…”

Section: Analysis Of Chitosan (1) and Its Derivatives (2-5) By Ft-irmentioning

confidence: 95%

Synthesis of an O-alkynyl-chitosan and its chemoselective conjugation with a PEG-like amino-azide through click chemistry

Oliveira

Martins

Mafra

et al. 2012

Carbohydrate Polymers

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a b s t r a c t N-Phthaloyl-chitosan O-prop-2-ynyl carbamate was prepared as a biopolymer amenable to undergo chemoselective conjugation by azide-alkyne coupling, while allowing upturn of chitosan's amines after dephthaloylation. N-phthaloylchitosan was prepared according to previously described methods and, due to its low solubility in current organic media, subsequent modifications were run in heterogeneous conditions. Activation of hydroxyls with carbonyl-1,1 -diimidazole and coupling to propargylamine yielded N-phthaloyl-chitosan O-prop-2-ynyl carbamate, then coupled to a model PEG-like azide by azide-alkyne coupling, giving the expected triazolyl conjugate. N-Dephthaloylation allowed recovery of the free amines, responsible for chitosan's bioadhesion and tissue-regeneration properties.The structures of all polymers were confirmed by Fourier-transformed infra-red (FT-IR) and X-ray photoelectron (XPS) spectroscopies, as well as by solid-state nuclear magnetic resonance (SSNMR). All chitosan derivatives were poorly soluble in both aqueous and organic media, which makes them suitable for topical applications or for removal of toxic substances from either the gastric intestinal tract or environmental sources.

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Section: Analysis Of Chitosan (1) and Its Derivatives (2-5) By Ft-irmentioning

confidence: 95%

Synthesis of an O-alkynyl-chitosan and its chemoselective conjugation with a PEG-like amino-azide through click chemistry

Oliveira

Martins

Mafra

et al. 2012

Carbohydrate Polymers

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“…The UV cutoff wavelength was found to be 290 nm for the grown crystal. The large band gap and transparency shown by the crystals make them a possible choice for optoelectronic application [39,46]. The transmittance (T) is given by the relation [47]:…”

Section: Optical Transmittance and Absorption Studiesmentioning

confidence: 99%

Structural, optical and dielectric studies of lithium sulphate monohydrate single crystals

Najar

Vakil

Want

2017

Materials Science-Poland

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Optical, dielectric, and thermal properties of lithium sulphate monohydrate crystals grown by slow evaporation method have been studied. The crystal structure was resolved by direct methods using single crystal X-ray diffraction data collected at room temperature and refined by full-matrix least-squares procedures to a final R-value of 0.0174. Plasma energy, Penn gap, Fermi energy and electronic polarizability of the grown crystal were calculated from single crystal XRD data. The electronic polarizability of lithium sulfate monohydrate was also calculated and compared with the theoretical data using Clausius-Mossotti equation. Optical band gap calculated from optical data for the grown crystal is 4.49 eV. Fourier Transform Infrared Spectroscopy study confirmed the presence of water in the crystal structure. The AC conductivity, dielectric constant and dielectric loss of the grown crystal were systemically investigated, showing a peak at about 130°C which could be attributed to the water molecules in the crystal structure. The anomalous dielectric properties shown by the crystal have been correlated with its thermal behavior. The title crystal obeys Jonscher's power law relation; σ(ω) = σ o + Aω s , with temperature dependent exponent s < 1. The activation energy calculated for the material is 0.24 eV and suggests protonic conduction by hopping mechanism in addition to cationic conduction by lithium ions. The micro-indentation study was also carried out which revealed that the crystal belongs to a category of soft materials.

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“…4 recorded in the range of 190-1100 nm using PERKIN ELMER LAMBDA 35 UV-Visible spectrophotometer. For optical fabrication, the crystal should be highly transparent in the considerable region of wavelength [12,13]. The lower cut-off wavelength for the grown crystals was observed to be around 300 nm.…”

Section: Uv-visible Spectral Analysis:-mentioning

confidence: 99%

Investigations on the Effect of Amino Acid Doping on the Growth and Characterization of Alkali Metal Acid Phthalate Single Crystals.

Dhavud¹,

Prakash²

2017

IJAR

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Undoped and 0.5 mol% of L-aspartic acid (LA-C 4 H 7 NO 4 ) and L-threonine (LT-C 4 H 9 NO 3 ) doped sodium acid phthalate (NaAP) single crystals were successfully grown from aqueous solution by slow evaporation solution growth technique. Single X-ray diffraction revealed that the grown crystals possess orthorhombic crystal structure and revealed lattice distortion due to impurities. The crystallinity nature of the grown crystals was analyzed by powder X-ray diffraction analysis. Functional groups and the modes of vibrations were identified by FT-IR spectral analysis. Optical transmittance shows that L-threonine doped NaAP crystal possesses higher transparency compared to undoped NaAP and L-aspartic acid doped NaAP and the band gap energy values of the grown crystals were calculated. The photoluminescence properties of the grown crystals were investigated. The mechanical strength of the grown crystals was estimated by microhardness studies. The second harmonic generation of the grown crystals was confirmed by the Kurtz and Perry technique. Antibacterial activity of the title compounds against Streptococcus pneumoniae, Escherichia coli, and Klebsiella pneumonia strains was studied.Copy Right, IJAR, 2017,. All rights reserved. …………………………………………………………………………………………………….... Introduction:-Semiorganic crystals are a new category of materials recently examined for their fascinating properties and stable physiochemical properties, which are significant for device fabrication and applied research [1,2]. The high nonlinearity, high resistance to laser-induced damage, low angular sensitivity and better mechanical hardness of semiorganic crystals incorporate in the strong NLO properties and chemical flexibility of organic materials with the physical sturdiness and excellent transmittance of inorganic materials [3][4][5][6]. In addition, the approach of high NLO efficiency organic molecules with the favorable physical properties of the inorganic materials has been an active area of research in the last two decades.Organic material with high nonlinear optical coefficients combines with an inorganic material exhibiting excellent physical properties, giving semiorganic material. Hydrogen bonding of acid based interaction between organic cation and an inorganic anion of semiorganic give mechanical strong and thermally stable NLO crystals [7]. Highly

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FT Raman and FT–IR spectral studies of 3-mercapto-1,2,4-triazole

Cited by 152 publications

References 5 publications

Synthesis of an O-alkynyl-chitosan and its chemoselective conjugation with a PEG-like amino-azide through click chemistry

Synthesis of an O-alkynyl-chitosan and its chemoselective conjugation with a PEG-like amino-azide through click chemistry

Structural, optical and dielectric studies of lithium sulphate monohydrate single crystals

Investigations on the Effect of Amino Acid Doping on the Growth and Characterization of Alkali Metal Acid Phthalate Single Crystals.

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