All chemical reagents and organic solvents were obtained from commercial suppliers and used without further purification. Thin-layer chromatography (TLC) was performed to check the purity of compounds on silica gel 60 HF254 plates (Merck, Germany). The melting point ranges (m.p.) were taken on an Electrothermal IA9100 apparatus (Stone, UK) using the one-end open capillary method and were uncorrected. IR spectra (KBr discs, 500–4000 cm−1) were recorded on a NEXUS 670 FT-IR spectrophotometer (Thermo Nicolet, USA). 1H and 13C NMR spectra were recorded using DMSO-d6 and CDCl3 as solvents and tetramethylsilane (TMS) as an internal reference on an AM-400 spectrometer (Bruker, Germany) at working frequencies 400 and 100 MHz, respectively. High resolution mass spectrometry (HRMS) analyses were conducted using a Bruker “Compact” quadrupole time-of-flight mass spectrometry (qTOF-MS, Germany) coupled with an Apollo II ion funnel electrospray ionization (ESI) source. UV-Vis absorption and fluorescence spectra were recorded in methanol at 10 μM using UV/Visible Metertech SP-8001 and Hitachi F-2710 spectrophotometers, respectively. In both cases, cells with an optical path of 10 mm were used and the fluorescence was acquired with a slit width of 2.5 nm.
Nexus 670 ft ir spectrophotometer
Manufactured by Thermo Fisher Scientific
Sourced in United States
The NEXUS 670 FT-IR spectrophotometer is a laboratory instrument designed for the analysis of various materials and substances. It uses Fourier Transform Infrared (FT-IR) technology to generate and detect infrared radiation, which can be used to identify and characterize the chemical composition of samples. The NEXUS 670 is capable of performing a wide range of spectroscopic analyses, including qualitative and quantitative measurements of organic and inorganic compounds.
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7 protocols using nexus 670 ft ir spectrophotometer
1
Characterization of Novel Organic Compounds
2
Detailed Synthesis and Characterization
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Reagents for synthesis were obtained from Sigma-Aldrich (St. Louis, MO, USA). 1H and 13C-NMR spectra (400 MHz for proton and 100 MHz for carbon) were recorded on an AM-400 spectrometer (Bruker, Rheinstetten, Germany); IR spectra (KBr pellets, 500–4000 cm−1) were recorded on a NEXUS 670 FT-IR spectrophotometer (Thermo Nicolet, Madison, WI, USA). Mass spectrometry was conducted in a High resolution mass spectrometer Exactive™ Plus Orbitrap (ThermoFisher Scientific, Bremen, Germany), Scan parameters: Resolution: 140,000, AGC target: 3e6, Max. inject time: 200, HESI source: Sheath gas flow: 10, Aux gas flow rate: 3, Sweep gas flow rate: 0, Capillary temp.: 250 °C, S-lens RF level: 0, Heater temp: 50 °C.
3
Spectroscopic Characterization of Organic Compounds
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Melting points were calculated using a Büchi apparatus(Stone, Staffs, UK). The progress of reactions and the purity of compounds were checked through analytical thin layer chromatography (TLC) on silica gel plates (Merck 60 F254, KGaA Darmstadt, Germany). Whenever necessary, compounds were purified by column chromatography using mixtures of solvents in crescent polarity. Chemicals were purchased from Aldrich (KGaA Darmstadt, Germany). 1H and 13C NMR spectra (400 MHz for proton and 100 MHz for carbon) were recorded in an AM-400 spectrometer (Bruker, Rheinstetten, Germany) using DMSO-d6 and CDCl3. Tetramethylsilane (TMS) was used as an internal standard. Chemical shifts (δ) and J values are reported in ppm and Hz, respectively, relative to the solvent peak CDCl3 at 7.26 ppm for protons and 77 ppm for carbon atoms, and DMSO-d6 2.5 ppm for protons and 39.7 ppm for carbon atoms. Signals were designated as follows: s, singlet; d, doublet; dd, doublet of doublets; t, triplet; m, multiplet; br. s, broad singlet. IR spectra (KBr pellets, 500–4000 cm−1) were recorded on a NEXUS 670 FT-IR spectrophotometer (Thermo Nicolet, Madison, WI, USA).
4
Microwave-Assisted Synthesis and Characterization of Organic Compounds
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All chemical reagents and organic solvents were obtained from commercial suppliers and used without further purification. The experiments were performed in a Discover microwave apparatus (CEM Corporation, USA) and a Branson 1510 ultrasonic cleaning bath with a mechanical timer and a heater switch, 47 kHz. Thin-layer chromatography (TLC) was performed to check the purity of compounds on silica gel 60 HF254 plates (Merck, Germany). The melting point ranges (mp) were taken on an Electrothermal IA9100 apparatus (Stone, UK) using the one-end open capillary method and were uncorrected. IR spectra (KBr discs, 500–4000 cm−1) were recorded on a NEXUS 670 FT-IR spectrophotometer (Thermo Nicolet, USA). 1H and 13C NMR spectra were recorded using DMSO-d6 and CDCl3 as solvents and tetramethylsilane (TMS) as an internal reference on an AM-400 spectrometer (Bruker, Germany) at working frequencies 400 and 100 MHz, respectively. High-resolution mass spectrometry (HRMS) analyses were carried out using a Bruker “Compact” quadrupole time-of-flight mass spectrometry (qTOF-MS, Germany) coupled with an Apollo II ion funnel electrospray ionization (ESI) source. The UV-Vis spectrum was recorded using a Spectroquant UV/VIS Pharo 300 Spectrophotometer (Merck, Germany) in the wavelength range of 160–750 nm.
5
Characterization of Organic Compounds
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Melting points were measured using a Büchi apparatus and are uncorrected. The purity of compounds was checked through analytical TLC (thin layer chromatography) on silica gel plates (Merck 60 F254, KGaA, Darmstadt, Germany). Compounds were purified by column chromatography when necessary. Chemicals were bought from Aldrich (KGaA, Darmstadt, Germany) and used without further purification. 1H and 13C-NMR spectra (400.1 MHz for proton and 100.6 MHz for carbon) were recorded in an AM-400 spectrometer (Bruker, Rheinstetten, Germany), using DMSO-d6 as solvent. Tetramethylsilane (TMS) was used as an internal standard. Chemical shifts (δ) and J values are reported in ppm and Hz, respectively; relative to the solvent peak DMSO-d6 2.5 ppm for protons and 39.7 ppm for carbon atoms. Signals are designated as follows: s, singlet; d, doublet; dd, doublet of doublets; t, triplet; m, multiplet; br.s, broad singlet. IR spectra (KBr pellets, 500–4000 cm−1) were recorded on a NEXUS 670 FT-IR spectrophotometer (Thermo Nicolet, Madison, WI, USA).
6
Characterization of Microcapsules via Advanced Techniques
7
Determination of Degree of Conversion in Resin Polymers
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