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Organic Radicals [Magnetic Materials]

 Ferromagnetic and ferrimagnetic properties of metal compounds are based on contributions of unpaired d- or f-electrons of transition or lanthanoid metals. On the other hand, magnetic properties of metal-free organic compounds are due to unpaired π-electrons. Normally, π-electrons are favorable to electrical conduction in material science, because they are movable by the π-conjugation effect, but they have received less attention for magnetic materials. However, diverse chemical modifications of an organic molecule have produced organic radical-based ferromagnets.1,2) It is known that the charge transfer complex obtained from fullerene with tetrakis(dimethylamino)ethylene (TDAE) becomes an organic magnet.3) In addition to using a π-conjugated organic radical, localized free radical species also provide organic magnets. 4-Nitrophenylnitronyl nitroxide (NPNN) was the first organic ferromagnet in a pure organic radical.4) Nogami et al. reported that 2,2,6,6-tetramethylpiperidine 1-oxyl (TEMPO) and its analogues became ferromagnets or antiferromagnets.5,6) Furthermore, 1,1-diphenyl-2-picrylhydrazyl (DPPH) is an antiferromagnet at extremely low temperature.
A1343
4-Amino-2,2,6,6-tetramethylpiperidine 1-Oxyl Free Radical
A1348
4-Acetamido-2,2,6,6-tetramethylpiperidine 1-Oxyl Free Radical [Catalyst for Oxidation]
A3235
4-Amino-2,2,6,6-tetramethylpiperidine 1-Oxyl Free Radical (purified by sublimation)
A5440
PTIO (=2-Phenyl-4,4,5,5-tetramethylimidazoline-3-oxide-1-oxyl) [Stable free radical reagent for the simultaneous determination of NO and NO2 in the atmosphere]
B5642
Bis(2,2,6,6-tetramethyl-4-piperidyl-1-oxyl) Sebacate
C1406
3-Carboxy-2,2,5,5-tetramethylpyrrolidine 1-Oxyl Free Radical
C1428
4-Carboxy-2,2,6,6-tetramethylpiperidine 1-Oxyl Free Radical
C1432
4-(2-Chloroacetamido)-2,2,6,6-tetramethylpiperidine 1-Oxyl Free Radical
C1782
4-Cyano-2,2,6,6-tetramethylpiperidine 1-Oxyl Free Radical
D2295
2-(4-Nitrophenyl)-4,4,5,5-tetramethylimidazoline-3-oxide-1-oxyl Free Radical
D2399
16-DOXYL-stearic Acid Free Radical
D4313
1,1-Diphenyl-2-picrylhydrazyl Free Radical
G0020
Galvinoxyl Free Radical
G0555
4-Glycidyloxy-2,2,6,6-tetramethylpiperidine 1-Oxyl Free Radical
H0865
4-Hydroxy-2,2,6,6-tetramethylpiperidine 1-Oxyl Free Radical
H0878
4-Hydroxy-2,2,6,6-tetramethylpiperidine 1-Oxyl Benzoate Free Radical [Catalyst for Oxidation]
I0486
4-Isothiocyanato-2,2,6,6-tetramethylpiperidine 1-Oxyl Free Radical
I0487
4-(2-Iodoacetamido)-2,2,6,6-tetramethylpiperidine 1-Oxyl Free Radical
M1197
4-Methoxy-2,2,6,6-tetramethylpiperidine 1-Oxyl Free Radical [Catalyst for Oxidation]
M1531
4-Methacryloyloxy-2,2,6,6-tetramethylpiperidine 1-Oxyl Free Radical
O0266
4-Oxo-2,2,6,6-tetramethylpiperidine 1-Oxyl Free Radical
O0521
4-Oxo-2,2,6,6-tetramethylpiperidine 1-Oxyl Free Radical (purified by sublimation)
T1560
2,2,6,6-Tetramethylpiperidine 1-Oxyl Free Radical
T3169
2,2,6,6-Tetramethyl-4-(2-propynyloxy)piperidine 1-Oxyl Free Radical
T3751
2,2,6,6-Tetramethylpiperidine 1-Oxyl Free Radical (purified by sublimation)

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