13C NMR spectroscopy

The ligand picolinoyl(4-ethylthiosemicarbazide) HL was synthesized by the reaction of picolinohydrazide and ethyl isothiocyanate in absolute ethanol. The structure of HL was characterized by spectroscopic methods such as IR, 1H, and 13C NMR spectroscopy.

6p viberkshire 09-08-2023 8 5   Download

This study describes the synthesis of magnetic nanohydrogels by miniemulsion polymerization technique. Dextran was derivatized by the glycidyl methacrylate to anchor vinyl groups on polysaccharides backbone, allowing its use as a macromonomer for miniemulsion polymerization, as confirmed by proton nuclear magnetic resonance spectroscopy (13C NMR).

8p vihermione 06-01-2023 6 3   Download

We propose a novel approach relied on high-resolution solid-state 13C NMR spectroscopy to quantify the crystallinity index of chitosans (Ch) prepared with variable average degrees of acetylation (DA) from 5% to 60 % and average weight molecular weight (Mw) ranged in 0.15 × 106 g mol− 1 –1.2 × 106 g mol− 1 .

14p viginny 30-12-2022 10 2   Download

An efficient 2-component synthesis of a series of 3-(2-(substituted phenylamino)thiazol-4-yl)-2H -chromen-2- ones (3a–j) was achieved by the reaction of 3-(2-thiocyanatoacetyl)-2H -chromen-2-one (1) with a variety of suitably substituted anilines in 1:1 molar ratio in ethanol. The structures of the products were established by elemental analyses, and UV-vis, FTIR, 1H and 13C NMR, and mass spectroscopy. 3-(2-(4-Methylphenylamino)thiazol-4-yl)-2 H -chromen-2- one (3j) was further characterized by single crystal X-ray diffraction study.

11p langthannam 29-12-2021 10 0   Download

Novel water-soluble metallophthalocyanines (M: Co, Ni, Cu, Zn) containing azo dye were characterized. The structures were confirmed by IR, UV/vis, 1H NMR, 13C NMR, mass spectroscopy, and elemental analysis. Photochemical properties and aggregation behavior of zinc phthalocyanines were investigated. Singlet oxygen quantum yields of the zinc phthalocyanines (2d, 3d, 5d, and 6d) were 0.8, 0.57, 0.71, and 0.46, respectively.

16p langthannam 29-12-2021 4 0   Download

Methyl 4-((9H-(carbazole-9-carbanothioylthio) benzoate (MCzCTB) was chemically synthesized and characterized by FTIR, 1H NMR, and 13C NMR. A novel synthesized monomer was electropolymerized on a glassy carbon electrode (GCE) in various initial molar concentrations of [MCzCTB] 0 = 1,3,5, and 10mM in 0.1M NaClO4/CH3CN and 1M H2SO4. P(MCzCTB)/GCE was characterized by cyclic voltammetry, Fourier transform infrared-attenuated transmittance reflectance, scanning electron microscopy-energy dispersive X-ray, and electrochemical impedance spectroscopy.

12p langthannam 29-12-2021 11 0   Download

Novel hexakisurea and thiourea cyclotriphosphazene compounds (3–7) were synthesized. The structure of all compounds was identified using FT-IR 1H, 13C, and 31P NMR spectroscopy; MALDI-TOF MS; and elemental analysis. The optical sensor properties for anions of 3–7 were investigated using UV-Vis spectroscopy. It was determined that compounds 6 and 7 are spectrophotometric and naked eye sensors for F− and CN− anions, respectively. Sensor properties of these compounds for anions were investigated using UV-Vis spectroscopy. The stoichiometry of host–guest complexes was found to be 1:6.

12p langthannam 29-12-2021 10 1   Download

Novel five-membered (κ2−C,N) -palladacyclic complexes were prepared from the reaction of the corresponding acetate-bridged palladacycle dimer with N-heterocyclic carbene (NHC) ligands in high yields. Palladacyclic complexes (3) were fully characterized by elemental analysis and 1H and 13C NMR spectroscopy. Palladacyclic complexes were tested as catalyst for the C–C bond forming reaction. These complexes were found to be efficient catalysts for the Suzuki–Miyaura reaction of aryl bromides.

7p langthannam 29-12-2021 15 0   Download

In the current study, cisplatin loaded (Poly(lactic-co-glycolicacid)) (PLGA) stabilized with 4-phenylphenacylbromide based surfactants nanoparticles were developed for drug delivery applications. For the course of this study four new 4-phenylphenacylbromide based compounds abbreviated as PA(C2 )3 , PA(C8 )3 , PAC16 and PAC18 have been synthesized by the reaction of 4-phenylphenacylbromide with various long chain amines. The new surfactants were characterized with 1 H and 13C NMR and FTIR spectroscopy.

10p langthannam 29-12-2021 10 0   Download

Calix[4]pyrrole derivatives with bulky substituents at their meso-positions were synthesized via mixed condensation of pyrrole with cyclohexanone and acetophenone derivatives. Anion binding studies, carried out by isothermal titration calorimetry in 1,2-dichloroethane with Cl− and CH3CO−2 anions in the form of their tetrabutylammonium salts, revealed that these new calix[4]pyrrole derivatives can bind the aforementioned anions as effectively as the unsubstituted “parent” system, octamethylcalix[4]pyrrole (1).

15p tudichquannguyet 29-11-2021 2 0   Download

New azo dyes bearing 2-pyridone and benzimidazole moieties were prepared using diazotization of 4-(1Hbenzo[d]imidazol-2-yl)aniline and coupling of the obtained diazonium salt with substituted 3-cyano-2-pyridones. Obtained compounds were characterized via UV-Vis, FT-IR, and 1H and 13C NMR spectroscopy as well as by elemental analysis data. The UV-Vis spectra of the synthesized dyes were measured in thirteen solvents of different properties at room temperature. Solvatochromism and tautomerism of novel azo dyes were discussed.

12p tudichquannguyet 29-11-2021 11 0   Download

The hydrogen bond donating ability of 1,8-naphthalenediol was investigated via a series of 1H, 13C, and 31P NMR experiments. Complexation studies using triphenylphosphine oxide and cyclohexanone as hydrogen bond acceptors revealed that 1,8-naphthalenediol is a more effective hydrogen bond donor compared to 1-naphthol and 8-methoxy-1- naphthol. Afterwards, its effectiveness as a hydrogen bonding catalyst was demonstrated in the Friedel–Crafts-type addition reaction of indole to trans-β -nitrostyrene.

10p tudichquannguyet 29-11-2021 11 1   Download

New bis(isatins-thio/carbohydrazones) based on Schiff bases were prepared from terephthalaldehyde biscarbohydrazone and 5-substituted isatins in the presence of a drop of sulfuric acid under reflux in ethanol. Terephthalaldehyde bis(thio/carbohydrazone) was synthesized by the reaction of (thio)/carbohydrazide and terephthalaldehyde in the presence of a few drops of acetic acid under reflux in ethanol. The structures of these synthesized compounds were determined using IR, 1H NMR, and 13C NMR spectroscopy and elemental analysis.

20p tudichquannguyet 29-11-2021 14 1   Download

Phenyl-4,4-di(3,6-dibutoxyphthalonitrile) (3) was synthesized by the reaction of 1,4-phenylenebisboronic acid (1) and 4-bromo-3,6-dibutoxyphthalonitrile (2), using Suzuki cross-coupling reaction. The newly synthesized compound (3) was characterized by FT-IR, MALDI-MS, ESI-MS, 1 H-NMR, 13C-NMR, and 13C-DEPT-135-NMR.

11p tudichquannguyet 29-11-2021 6 1   Download

The new benzimidazolium derivative (SM-1) salt with ion exchange from the (SM-0)was fabricated and characterized by protonnuclear magnetic resonance (1 H-NMR), carbon-nuclear magnetic resonance (13C-NMR), Fourier-transform infrared spectroscopy (FTIR), electrospray ionization (EIS-MS), thermal analysis (TG), cyclic voltammetry (CV), and ultraviolet-visible spectroscopy (UV-vis), for electrolytes (liquid or dried) in the DSSC charge transportation mechanism.

11p tudichquannguyet 29-11-2021 18 0   Download

Two naphthalene pyrazole ligands were synthesized using KOH/DMSO and Cu catalyst and characterized with FT-IR, ESIMS, 1H, and 13C NMR spectroscopies. The crystal structures of 1-(2-methylnaphthalen-1-yl)-1H-pyrazole (MeNap-Pz) ligand have been determined with X-ray crystal structure analysis. Reaction of the ligands with Cu(NO3)2x3.5H2O gave two new complexes and characterized with magnetic susceptibility, molar conductance, FT-IR, LCMS-MS, ICP-OES, NMR, thermogravimetric analysis, and ESR spectra.

24p tudichquannguyet 29-11-2021 17 0   Download

Identification of individual components in complex mixtures is an important and sometimes daunting task in several research areas like metabolomics and natural product studies. NMR spectroscopy is an excellent technique for analysis of mixtures of organic compounds and gives a detailed chemical fingerprint of most individual components above the detection limit.

8p vikentucky2711 26-11-2020 12 1   Download

Three fungal metabolites, (1) O-methylsilvaticol, (2) orthosporin and (3) diplosporin were isolated from a rare fungus, Kretzschmaria sandvicensis, collected in Dien Bien, in northwest Vietnam. Their structures were established using a combination of high resolution MS (FT-ICR-MS) and 1H-NMR, 13C-NMR, HSQC and HMBC spectroscopy. They were evaluated for anticancer properties against the KB cell line.

5p tamynhan8 04-11-2020 9 2   Download

From the roots of Codonopsis pilosula (Franch) Nannf (Campanulaceae) five triterpenoids: taraxerol, taraxeryl acetate, 14-α-taraxeran-3-one and D:B-friedoolean-5-ene-3-β-ol as well as α-spinasterone were isolated. Their structures have been identified by MS, 1 H-, 13C-NMR spectroscopy and comparison with reported data.

6p chikychiky 11-11-2018 38 0   Download

The aim of this study was to examine the use of renewable diphenolic acid (DPA) as starting materials together with benzylamine and paraformaldehyde for the synthesis of novel polybenzoxazine resin with low curing temperature. The monomer structure was confirmed by 1 H and 13C nuclear magnetic resonance (NMR) spectroscopy, and Fourier transform infrared (FTIR) spectroscopy.

7p cumeo3000 01-08-2018 36 0   Download