Aviii 400 mhz spectrometer

Manufactured by Bruker

Sourced in Germany, United States

The AVIII 400 MHz spectrometer is a nuclear magnetic resonance (NMR) spectrometer designed by Bruker. The core function of the AVIII 400 MHz spectrometer is to perform high-resolution NMR analysis on samples, providing detailed structural and chemical information about the compounds present.

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400 MHz spectrometer (382 citations) 400 spectrometer (95 citations) Bruker spectrometers (71 citations) AVIII spectrometer (31 citations) AVIII 400 MHz (12 citations) AVIII 400 spectrometer (10 citations) AVIII 400 MHz NMR spectrometer (9 citations) AVIII 400 MHz BBFO1 spectrometer (2 citations)

24 protocols using aviii 400 mhz spectrometer

NMR Analysis of Cured Adhesives

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Eighty
milligrams of freeze-dried uncured adhesives were dissolved in 0.5
mL of D₂O for NMR shifts control for solution-state ¹³C NMR analysis. The spectra were obtained on a Bruker AV-III
400 MHz spectrometer (Germany) at 25 °C. The solid-state CP-MAS ¹³C NMR spectra were acquired at 100 MHz, on a Bruker AV-III
400 MHz spectrometer (Germany). The cured adhesives were prepared
by treating the uncured adhesives at 120 °C for 2 h in an air
convection oven. The uncured and cured adhesive powders were packed
into a zirconium oxide rotor sealed with a Kel-F cap for analysis.
The acquisition time was 0.01 s with a number of transients, approximately
5000 for each experiment.^{35 (link)}

Pang B., Li M.K., Yang S., Yuan T.Q., Du G.B, & Sun R.C. (2018). Eco-Friendly Phenol–Urea–Formaldehyde Co-condensed Resin Adhesives Accelerated by Resorcinol for Plywood Manufacturing. ACS Omega, 3(8), 8521-8528.

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Synthesis of Imidazolium-Based Ionic Liquids

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All chemicals were provided by Aladdin Company (China) and were used as received: 1-methyl imidazole (99%), pyridine (99.5%), 1,4-dichlorobutane (99%), 1,5-dichloropentane (99%), 1,6-dicholorohexane (99%) and KPF₆ (99%). ¹H-NMR was recorded on an AV-III 400 MHz spectrometer (Bruker, Germany). ILs were dried in a DZF-6050 vacuum (Shanghaiyiheng, China).

Sun Y.X., Wang Y.Y., Shen B.B., Zhang B.X, & Hu X.M. (2018). Synthesis and investigation of physico-chemical properties of dicationic ionic liquids. Royal Society Open Science, 5(12), 181230.

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Synthesis and Characterization of Novel Organic Compounds

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Stoppers 2a, 2c, 2d, 3, 4, and 5 and reagents [1,10-decanediamine, methyl 2-(4-butoxyphenoxy)acetate, and so on] were commercially available (99%) and used as received. Further purification and drying of the solvents by standard methods were employed and distilled prior to use when necessary.
¹H NMR and ¹³C NMR spectra were recorded on a Bruker AVIII-400 MHz spectrometer. 2D NMR spectra were recorded on a Bruker AV-600 MHz spectrometer. All NMR used tetramethylsilane (TMS) as the internal standard.
A Bruker Micro-TOF spectrometer was used to investigate the high-resolution mass (ESI) of the compounds.
A Bruker Smart APEX-2 CCD diffractometer was used to investigate the X-ray single-crystal structures.

Ma L., Han Y., Yan C., Chen T., Wang Y, & Yao Y. (2022). Construction and Property Investigation of Serial Pillar[5]arene-Based [1]Rotaxanes. Frontiers in Chemistry, 10, 908773.

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Lignin Structure Analysis via FTIR and 2D-NMR

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The lignin
obtained was subjected to Fourier transform infrared spectroscopy
(FTIR) analysis. The infrared spectra were acquired using a Thermo
Scientific Nicolet 7600 FTIR spectrometer over a frequency range between
4000 and 400 cm^–1.^{24 (link)} The
2D-NMR (HSQC) spectra of the hemicelluloses were acquired at 25°Con
a Bruker AVIII 400 MHz spectrometer (Bruker, Germany).^{25 (link)} The integrations of the peaks in the ¹³C-¹H spectrum and contours in 2D-NMR plots were conducted
using the MestReNova software. The detailed calculation method was
based on the modified method from previous literature.^{6 (link),28 (link)}

Fang S., Xia Q., Zhang L., Zhan P., Qing Y., Wu Z., Wang H., Shao L., Liu N., He J, & Liu J. (2023). Differentiated Fractionation of Various Biomass Resources by p-Toluenesulfonic Acid at Mild Conditions. ACS Omega, 8(27), 24247-24255.

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Characterization of Resorcinol-Formaldehyde Resins

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Functional groups were analyzed by
a Fourier transform infrared spectrometer (Thermo Fisher Nicolet Is5);
all samples were triturated and mixed with KBr in advance. ¹³C–¹H 2DNMR tests were performed by the heteronuclear
single quantum coherence (HSQC) method on a Bruker AV-III 400 MHz
spectrometer with C₂D₆OS as the solvent at 25
°C. DSC and TG tests of RF resins were both performed using a
simultaneous thermal analyzer (Netzsch STA449F5) under a N₂ atmosphere (30 mL min^–1) with a constant pressure.
Curing processes were analyzed by DSC tests in capped aluminous crucibles,
with different heating rates of 5, 10, 15, and 20 °C min^–1 and roughly identical sample weights of about 5 mg.
Pyrolysis behaviors were studied by TG tests with a constant heating
rate of 10 °C min^–1 and all sample weights
of about 10 mg in alumina crucibles. Gelation times of RF resins were
measured according to the standard of ISO 9396-1997, with a solid
content range of 75% ± 2% and a test temperature held at 130
°C. To reduce the influence of solvent volatilization and thermal
treatment, all test samples were dried at 40 °C, except for the
tests of gelation time.

Liu J., Xuan D., Chai J., Guo D., Huang Y., Liu S., Chew Y.T., Li S, & Zheng Z. (2020). Synthesis and Thermal Properties of Resorcinol–Furfural Thermosetting Resin. ACS Omega, 5(17), 10011-10020.

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Magnesium-Catalyzed Coupling Reactions

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All reactions were carried out under a protective atmosphere of argon using standard Schlenk techniques. Non-deuterated solvents were dried by heating to reflux over sodium ketyl radicals under nitrogen and deuterated solvents were degassed and stored over molecular sieves. Pre-catalysts [Mg(CH₂SiMe₃)₂, K(CH₂SiMe₃), LiMg(CH₂SiMe₃)₃, NaMg(CH₂SiMe₃)₃, KMg(CH₂SiMe₃)₃, Li₂Mg(CH₂SiMe₃)₄(TMEDA)₂, Na₂Mg(CH₂SiMe₃)₄(TMEDA)₂, K₂Mg(CH₂SiMe₃)₄(TMEDA)₂ and K₂Mg(CH₂SiMe₃)₄(PMDETA)₂] were prepared following literature procedures2 (link) and handled in a glovebox. Li(CH₂SiMe₃), 1 and 5 were obtained from Sigma-Aldrich; 1 and 3 from Alfa-Aesar; and 7 from Fluorochem. Substrates 11, 13, 15, 17, 19 and 21 were synthesised based on literature procedures82 (link) (characterisation data provided for new substrates and products 13–22 can be found in the ESI†). NMR spectra were recorded on a Bruker AV III 400 MHz spectrometer operating at 400.1 MHz for ¹H, 100.6 MHz for ¹³C or 128.4 MHz for ¹⁹F.

Fairley M., Davin L., Hernán-Gómez A., García-Álvarez J., O'Hara C.T, & Hevia E. (2019). s-Block cooperative catalysis: alkali metal magnesiate-catalysed cyclisation of alkynols †Electronic supplementary information (ESI) available: General experimental procedures, additional kinetic plots, NMR spectra of catalytic reactions, and characterization data for new compounds (PDF). See DOI: 10.1039/c9sc01598a. Chemical Science, 10(22), 5821-5831.

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Lignin Analysis via 2D HSQC and 31P NMR

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The lignin yields and sugar compositions of the SRELs and CEL were also analyzed according to the NREL standard method32 . The 2D HSQC spectra were recorded at 25 °C on a Bruker AVIII 400 MHz spectrometer (Bruker, Germany). For each sample, 60 mg of lignin was dissolved in 0.5 mL of DMSO-d₆. A semi-quantitative method based on 2D HSQC spectra was used to calculate the relative amount of inter-linkages and S/G ratio of the lignin samples19 . ³¹P NMR analysis was conducted based on the method reported by Granata and Argyropoulos30 . ³¹P NMR spectra were acquired after the reaction of lignin with 2-chloro-4, 4, 5, 5-tetramethyl-1, 3, 2-dioxaphospholane (TMDP). The parameters used in quantitative ³¹P NMR experiment were listed as follows: 30° pulse angle, 2 s relaxation delay (d₁), 64 K data points and 1024 scans. The analyses of the SREL and CEL samples were conducted three times, and the average value of the three repeated measurements was used as final result.

Chen W.J., Yang S., Zhang Y., Wang Y.Y., Yuan T.Q, & Sun R.C. (2017). Effect of alkaline preswelling on the structure of lignins from Eucalyptus. Scientific Reports, 7, 45752.

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Characterization of Organic Compounds via NMR and MS

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All chemical reagents are reagent grade and used as purchased. ¹H NMR (400 MHz) spectra were recorded on a Bruker AVIII 400 MHz spectrometer (Bruker, Billerica, MA, USA). The chemical shifts were reported in parts per million (ppm) using the 2.50 signal of DMSO (¹H NMR) and the 39.52 signal of DMSO (¹³C NMR) as internal standards. ESI Mass spectra (MS) were obtained on a SHIMADZU 2020 Liquid Chromatograph Mass Spectrometer (SHIMADZU, Kyoto, Japan).

Wu J., Feng B., Gao L.X., Zhang C., Li J., Xiang D.J., Zang Y, & Wang W.L. (2022). Synthesis and Biochemical Evaluation of 8H-Indeno[1,2-d]thiazole Derivatives as Novel SARS-CoV-2 3CL Protease Inhibitors. Molecules, 27(10), 3359.

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Comprehensive Analytical Characterization

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TLC analysis was done using precoated
silica on aluminum sheets. An FT-IR (KBr pellets) spectrum was recorded
in the range of 4000–400 cm^–1 using a Perkin-Elmer
FT-IR spectrometer. The NMR spectra were obtained by a Bruker AV-III
400 MHz spectrometer using TMS as an internal standard. The chemical
shifts were reported in parts per million (ppm), coupling constants
(J) were expressed in hertz (Hz), and signals were
described as singlet (s), doublet (d), triplet (t), and multiplet
(m). The mass spectra were recorded on Thermo Scientific DSQ-II. All
chemicals and solvents were of commercial grade and were used without
further purification. Single-crystal data was collected using Xcalibur
(EoS, Gemini). Thermogravimetric analyses (TG-DTA) were performed
using a SII TG/DTA 6300 EXSTAR analyzer under N₂ atmosphere.

Sahay I.I, & Ghalsasi P.S. (2019). Water-Assisted Self-Aggregation of Benzimidazole and Triazole Adducts. ACS Omega, 4(1), 437-443.

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Comprehensive Characterization of Graphene Quantum Dots

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Transmission electron microscopy (TEM) was performed on a Hitachi H-7650B TEM operating at 80 kV. The high-resolution transmission electron microscope (HR-TEM) image was taken using a FEI Tecnai F20 HR-TEM operating at 200 kV. The AFM image was acquired by a Bruker MultiMode 8 AFM equipment. The X-ray diffraction (XRD) patterns were obtained with a Bruker D8 using Cu Kα radiation (60 kV, 80 mA, λ = 1.5418 Å). The Fourier transform infrared (FT-IR) spectra were recorded by a Nicolet iN10 FT-IR spectrometer with a resolution of 4 cm⁻¹. The Raman spectra were measured on a LabRAM HR Evolution Raman spectrometer using a 532 nm laser beam. The X-ray photoelectron spectra (XPS) experiments were undertaken on an ESCALAB 250Xi photoelectron spectrometer using Al Kα (1486.6 eV) radiation. The electrochemical property was studied on a ChenHua CHI760e electrochemical workstation and a CT2001A LAND battery test system. ¹H and ¹³C heteronuclear single quantum coherence (HSQC) NMR spectra were acquired on a Bruker AVIII 400 MHz spectrometer. The preparation of the NMR testing samples was similar with our previous sampling methods.^{9,41 (link)} In brief, the dried GQD/Gr sample (40 mg) was dissolved in D₂O (0.5 mL) with ultrasonication for 10 min and the homogeneous solution was transferred into a 5 mm NMR tube for subsequent analysis under the Bruker pulse program.

Ding Z., Mei X, & Wang X. (2021). All-lignin converted graphene quantum dot/graphene nanosheet hetero-junction for high-rate and boosted specific capacitance supercapacitors. Nanoscale Advances, 3(9), 2529-2537.

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