1H NMR and 13C NMR spectra were recorded on a Bruker 600 MHz spectrometer and chemical shifts are reported in parts per million (δ). FT-IR spectra were recorded on a Perkin-Elmer 681 spectrometer. GC analyses were performed on a HP 6890 model, Series II by using a HP1 column (methyl siloxane; 30 m, 0.32 mm, 0.25 μm film thickness). Analytical thin-layer chromatography (TLC) was carried out on pre-coated 0.25 mm thick plates of Kieselgel 60 F254; visualization was accomplished by UV light (254 nm) or by spraying a solution of 5 % (w/v) ammonium molybdate and 0.2 % (w/v) cerium(III) sulfate in 100 mL 17.6 % (w/v) aq. sulfuric acid and heating to 473 K until blue spots appeared. Chromatography was conducted by using silica gel 60 with a particle size distribution 40–63 μm and 230–400 ASTM. GC-MS analyses were performed on HP 5995C model. High-resolution mass spectrometry (HRMS) analyses were performed using a Bruker microTOF QII mass spectrometer equipped with an electrospray ion source (ESI). Reagents and solvents, unless otherwise specified, were purchased from Sigma-Aldrich (Sigma-Aldrich, St. Louis, MO, USA) and used without any further purification.
681 spectrometer
Manufactured by PerkinElmer
The 681 spectrometer is a laboratory instrument designed for spectroscopic analysis. It is capable of measuring the absorption or emission spectra of samples across a range of wavelengths. The core function of the 681 spectrometer is to provide precise and accurate spectral data for scientific research and various analytical applications.
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2 protocols using 681 spectrometer
1
Spectroscopic Characterization Protocol
2
Spectroscopic Characterization of Synthesized Compounds
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Melting points taken on an Electrothermal apparatus were uncorrected.
1 H NMR and 13 C NMR spectra were recorded on a Varian-Mercury 300 MHz, Bruker-Aspect 3000 console 500 MHz spectrometer, or Bruker 600 MHz; chemical shifts are reported in parts per million (d). FT-IR spectra were recorded on a Perkin-Elmer 681 spectrometer. Thin-layer chromatography (TLC) was performed on silica gel sheets with fluorescent indicator. The spots on the TLC were visualized under ultraviolet light. Chromatography was conducted by using silica gel 60 with a particle size distribu tion of 40e63 mm and 230e400 ASTM. MS-ESI analyses were performed on Agilent 1100 LC/MSD trap system VL. All synthesized compounds were analyzed by CHN or by HPLC analysis performed on an Agilent 1260 Infinity instrument equipped with a 1260 DAD VLþ detector, and their purity is higher than 95%.
1 H NMR and 13 C NMR spectra were recorded on a Varian-Mercury 300 MHz, Bruker-Aspect 3000 console 500 MHz spectrometer, or Bruker 600 MHz; chemical shifts are reported in parts per million (d). FT-IR spectra were recorded on a Perkin-Elmer 681 spectrometer. Thin-layer chromatography (TLC) was performed on silica gel sheets with fluorescent indicator. The spots on the TLC were visualized under ultraviolet light. Chromatography was conducted by using silica gel 60 with a particle size distribu tion of 40e63 mm and 230e400 ASTM. MS-ESI analyses were performed on Agilent 1100 LC/MSD trap system VL. All synthesized compounds were analyzed by CHN or by HPLC analysis performed on an Agilent 1260 Infinity instrument equipped with a 1260 DAD VLþ detector, and their purity is higher than 95%.
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