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Title: Purity analyses of high-purity organic compounds with nitroxyl radicals based on the Curie–Weiss law

Abstract

This work reports an attempt to quantify the purities of powders of high-purity organic compounds with stable nitroxyl radicals (namely, 2,2,6,6-tetramethylpiperidine 1-oxyl (TEMPO), 1-oxyl-2,2,6,6-tetramethyl-4-hydroxypiperidine (TEMPOL), and 4-hydroxy-2,2,6,6-tetramethylpiperidine 1-oxyl benzoate (4-hydroxy-TEMPO benzoate)) in terms of mass fractions by using our “effective magnetic moment method,” which is based on both the Curie–Weiss law and a fundamental equation of electron paramagnetic resonance (ESR). The temperature dependence of the magnetic moment resulting from the radicals was measured with a superconducting quantum interference device magnetometer. The g value for each compound was measured with an X-band ESR spectrometer. The results of the purities were (0.998 ± 0.064) kg kg{sup −1} for TEMPO, (1.019 ± 0.040) kg kg{sup −1} for TEMPOL, and (1.001 ± 0.048) kg kg{sup −1} for 4-hydroxy-TEMPO benzoate. These results demonstrate that this analytical method as a future candidate of potential primary direct method can measure the purities with expanded uncertainties of approximately 5%.

Authors:
;  [1]
  1. National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), AIST Central-3, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563 (Japan)
Publication Date:
OSTI Identifier:
22410524
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION SPECTROSCOPY; APPROXIMATIONS; CURIE-WEISS LAW; ELECTRON SPIN RESONANCE; G VALUE; MAGNETIC MOMENTS; NITROXYL RADICALS; ORGANIC COMPOUNDS; POWDERS; SQUID DEVICES; TEMPERATURE DEPENDENCE

Citation Formats

Matsumoto, Nobuhiro, E-mail: nobu-matsumoto@aist.go.jp, and Shimosaka, Takuya. Purity analyses of high-purity organic compounds with nitroxyl radicals based on the Curie–Weiss law. United States: N. p., 2015. Web. doi:10.1063/1.4913725.
Matsumoto, Nobuhiro, E-mail: nobu-matsumoto@aist.go.jp, & Shimosaka, Takuya. Purity analyses of high-purity organic compounds with nitroxyl radicals based on the Curie–Weiss law. United States. doi:10.1063/1.4913725.
Matsumoto, Nobuhiro, E-mail: nobu-matsumoto@aist.go.jp, and Shimosaka, Takuya. Thu . "Purity analyses of high-purity organic compounds with nitroxyl radicals based on the Curie–Weiss law". United States. doi:10.1063/1.4913725.
@article{osti_22410524,
title = {Purity analyses of high-purity organic compounds with nitroxyl radicals based on the Curie–Weiss law},
author = {Matsumoto, Nobuhiro, E-mail: nobu-matsumoto@aist.go.jp and Shimosaka, Takuya},
abstractNote = {This work reports an attempt to quantify the purities of powders of high-purity organic compounds with stable nitroxyl radicals (namely, 2,2,6,6-tetramethylpiperidine 1-oxyl (TEMPO), 1-oxyl-2,2,6,6-tetramethyl-4-hydroxypiperidine (TEMPOL), and 4-hydroxy-2,2,6,6-tetramethylpiperidine 1-oxyl benzoate (4-hydroxy-TEMPO benzoate)) in terms of mass fractions by using our “effective magnetic moment method,” which is based on both the Curie–Weiss law and a fundamental equation of electron paramagnetic resonance (ESR). The temperature dependence of the magnetic moment resulting from the radicals was measured with a superconducting quantum interference device magnetometer. The g value for each compound was measured with an X-band ESR spectrometer. The results of the purities were (0.998 ± 0.064) kg kg{sup −1} for TEMPO, (1.019 ± 0.040) kg kg{sup −1} for TEMPOL, and (1.001 ± 0.048) kg kg{sup −1} for 4-hydroxy-TEMPO benzoate. These results demonstrate that this analytical method as a future candidate of potential primary direct method can measure the purities with expanded uncertainties of approximately 5%.},
doi = {10.1063/1.4913725},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 17,
volume = 117,
place = {United States},
year = {2015},
month = {5}
}