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Jes re1xe

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The JES-RE1XE is an electron spin resonance (ESR) spectrometer developed by JEOL. It is designed for analyzing the magnetic properties of materials and detecting paramagnetic species. The core function of the JES-RE1XE is to provide researchers with a sensitive and versatile tool for ESR spectroscopy.

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Lab products found in correlation

Qp2010 ultra, by Shimadzu (2 mentions)

2 protocols using jes re1xe

1

Spin Trap Experiment Protocol for EPR Analysis

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A typical procedure for a spin trap experiment is as follows: 4.75 mL of an acetone solution containing benzene (2.1 M), 30 wt% aqueous H2O2 (0.1 M), 1 (0.31 µmol, 67 µM), and DMPO (0.2 M) was vigorously stirred at 298 K. The sample for EPR was prepared by Ar bubbling (15 min) with a Teflon tube of 200 µl of the reaction solution in a quartz EPR tube (2.0 mm i.d.). EPR spectra of solutions were taken on a JEOL X-band spectrometer (JES-RE1XE) at 298 K. The g value was calibrated using an Mn2+ marker. The EPR spectra were recorded under non-saturating microwave power conditions. The magnitude of modulation was chosen to optimise the resolution and the signal-to-noise (S/N) ratio of the observed spectra. The double integrated first derivative of a stable radical 2,2-diphenyl-1-picrylhydrazyl radical (10 µM) was obtained from a EPR spectrum in a mixed solvent benzene/acetone/H2O (1:1:5, v/v/v) similar to the reaction conditions as a reference. The spin concentrations of DMPO–OOH signals in the reaction solutions observed by EPR were calculated by comparing with the value obtained from DPPH. The GC-MS (Shimadzu QP-2010 Ultra) measurements were performed as needed to examine the relation between the spin trap and the hydroxylation.
Yamada M., Karlin K.D, & Fukuzumi S. (2016). One-step selective hydroxylation of benzene to phenol with hydrogen peroxide catalysed by copper complexes incorporated into mesoporous silica–alumina †Electronic supplementary information (ESI) available: Cyclic voltammogram (Fig. S1), time profiles of phenol, p-benzoquinone, H2O2, spin or benzene (Fig. S2–S5 and S9 and S10), DFT results (Fig. S6 and Tables S1 and S2), UV-Vis absorption spectra (Fig. S7) and UV-Vis DRS (Fig. S8). See DOI: 10.1039/c5sc04312c. Chemical Science, 7(4), 2856-2863.
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2

Spin Trap Analysis of Radical Reactions

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A typical procedure for a spin trap experiment is as follows: 4.75 mL of an acetone solution containing benzene (2.1 M), 30 wt% aqueous H2O2 (0.1 M), 1 (0.31 μmol, 67 μM), and DMPO (0.2 M) was vigorously stirred at 298 K. The sample for EPR was prepared by Ar bubbling (15 min) with a Teflon tube of 200 μL of the reaction solution in a quartz EPR tube (2.0 mm i.d.). EPR spectra of solutions were obtained on a JEOL X-band spectrometer (JES-RE1XE) at 298 K. The g value was calibrated using a Mn2+ marker. The EPR spectra were obtained under non-saturating microwave power conditions. The magnitude of modulation was chosen to optimise the resolution and the signal-to-noise (S/N) ratio of the observed spectra. The double integrated first derivative of a stable radical, 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical (10 μM), was obtained from an EPR spectrum in a mixed solvent benzene/acetone/H2O (1 : 1 : 5, v/v/v) similar to the reaction conditions and used as a reference. The spin concentrations of DMPO–OOH signals in the reaction solutions observed by EPR were calculated by comparing with the value obtained from DPPH. The GC-MS (Shimadzu QP-2010 Ultra) measurements were performed as needed to examine the relationship between the spin trap and the hydroxylation.
Yamada M., Karlin K.D, & Fukuzumi S. (2016). One-step selective hydroxylation of benzene to phenol with hydrogen peroxide catalysed by copper complexes incorporated into mesoporous silica–alumina †Electronic supplementary information (ESI) available: Cyclic voltammogram (Fig. S1), time profiles of phenol, p-benzoquinone, H2O2, spin or benzene (Fig. S2–S5 and S9 and S10), DFT results (Fig. S6 and Tables S1 and S2), UV-Vis absorption spectra (Fig. S7) and UV-Vis DRS (Fig. S8). See DOI: 10.1039/c5sc04312c. Chemical Science, 7(4), 2856-2863.
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