An Organic Radical Ferromagnet

Kinoshita, Minoru; Turek, Philippe; Tamura, Masafumi; Nozawa, K.; Shiomi, Daisuke; Nakazawa, Yasuhiro; Ishikawa, Masayasu; Takahashi, Minoru; Awaga, Kunio; Inabe, Tamotsu; Maruyama, Yusei

doi:10.1246/cl.1991.1225

Cited by 262 publications

(99 citation statements)

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“…The first magnetic molecule was theoretically proposed and experimentally demonstrated in 1991, 35,36) and since then several spin polarized molecules have been synthesized and evaluated.…”

Section: Magnetic Moleculesmentioning

confidence: 99%

Prospects and Problems of Single Molecule Information Devices

Wada

Tsukada

Fujihira

et al. 2000

Jpn. J. Appl. Phys.

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Current information technologies use semiconductor devices and magnetic/optical discs, however, it is foreseen that they will all face fundamental limitations within a decade. This paper reviews the prospects and problems of single molecule devices, including switching devices, wires, nanotubes, optical devices, storage devices and sensing devices for future information technologies and other advanced applications in the next paradigm. The operation principles of these devices are based on the phenomena occurring within a single molecule, such as single electron transfer, direct electron-hole recombination, magnetic/charge storage and regand-receptor reaction. Four possible milestones for realizing the Peta (10 15 )-floating operations per second (P-FLOPS) personal molecular supercomputer are described, and the necessary technologies are listed. These include, (1) two terminal conductance measurement on single molecule, (2) demonstration of two terminal molecular device characteristics, (3) verification of three terminal molecular device characteristics and (4) integration of the functions of "molecular super chip". Thus, 1000 times higher performance information technologies would be realized with molecular devices.

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“…The first magnetic molecule was theoretically proposed and experimentally demonstrated in 1991, 35,36) and since then several spin polarized molecules have been synthesized and evaluated.…”

Section: Magnetic Moleculesmentioning

confidence: 99%

Prospects and Problems of Single Molecule Information Devices

Wada

Tsukada

Fujihira

et al. 2000

Jpn. J. Appl. Phys.

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“…The magnetic properties of organic free radicals have received considerable attention in recent years since the discovery of ferromagnetism in the ␤ phase of the organic radical p-NPNN below 0.6 K. 1 Since then a number of organic magnets have been reported, mostly with ordering temperatures below 1 K. We employed a strategy to implement the more radially diffuse orbitals associated with heavier p-block elements such as S and Se to enhance exchange and raise magnetic ordering temperatures. 2 This has subsequently led to a number of other heavy p-block organic radicals with high magnetic ordering temperatures.…”

Section: Introductionmentioning

confidence: 99%

Spin density studies onp-O2NC6F4CNSSN: A heavyp
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et al. 2010
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A complete picture of the spin density distribution in the organic radical p-O 2 NC 6 F 4 CNSSN has been obtained by a combination of polarized neutron diffraction, electron paramagnetic resonance ͑EPR͒, and electron-nuclear double resonance ͑ENDOR͒ spectroscopies, and ab initio density-functional theory ͑DFT͒ calculations. Polarized neutron diffraction revealed that the spin distribution is predominantly localized on the N and S atoms ͑+0.25 B and +0.28 B , respectively͒ of the heterocyclic ring with a small negative spin density on the heterocyclic C atom ͑−0.06 B ͒. These spin populations are in excellent agreement with both ab initio DFT calculations ͑spin populations on the C, N, and S sites of −0.07, 0.22 and 0.31, respectively͒ and cw-EPR studies which estimated the spin population on the N site as 0.24. The DFT calculated spin density revealed less than 1% spin delocalization onto the perfluoroaryl ring, several orders of magnitude lower than the density on the heterocyclic ring. cw-ENDOR studies at both X-band ͑9 GHz͒ and Q-band ͑34 GHz͒ frequencies probed the spin populations on the two chemically distinct F atoms. These spin populations on the F atoms ortho and meta to the dithiadiazolyl ring are of magnitude 10 −3 and 10 −4 , respectively.

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“…A small TiL 2 crystal, 2 Â 2 Â 1 mm 3 , was mounted with the a axis parallel to the 7 T applied magnetic field. The flipping ratios (F N ) of the more intense reflections were measured: F N 39:1 at T 1.5 K. By measuring the integrated nuclear intensities of the same set of reflections in a zero field, [12] it was found that the room temperature X-ray crystal structure [8] could be used to model and normalize the F N and to determine their phase.…”

mentioning

confidence: 99%

“…[3,6] These natural antibiotics, however, bind the RRE with relatively low affinity and specificity.…”

mentioning

confidence: 99%

Spin-Density Map of the Triplet Ground State of a Titanium(IV) Complex with Schiff-Base Diquinone Radical Ligands: An Investigation Using Polarized-Neutron Diffraction and Density-Functional Theory

Pontillon¹,

Bencini²,

Caneschi³

et al. 2000

Angew. Chem. Int. Ed.

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An Organic Radical Ferromagnet

Abstract: The γ-phase crystal of 2-(4′-nitrophenyl)-4,4,5,5-tetramethyl-4 5-dihydro-1H−imidazol-1-oxy-3-N-oxide is shown to become a bulk ferromagnet below about 0.65 K from the measurements of magnetization of magnetic susceptibility and heat capacity.

Cited by 262 publications

References 12 publications

Prospects and Problems of Single Molecule Information Devices

Prospects and Problems of Single Molecule Information Devices

Spin density studies onp-O2NC6F4CNSSN: A heavyp
Luzón
¹
,
Campo
²
,
Palácio
³

et al. 2010
Phys. Rev. B
18
0
9
0
View full text Add to dashboard Cite

Spin-Density Map of the Triplet Ground State of a Titanium(IV) Complex with Schiff-Base Diquinone Radical Ligands: An Investigation Using Polarized-Neutron Diffraction and Density-Functional Theory

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An Organic Radical Ferromagnet

Abstract: The γ-phase crystal of 2-(4′-nitrophenyl)-4,4,5,5-tetramethyl-4 5-dihydro-1H−imidazol-1-oxy-3-N-oxide is shown to become a bulk ferromagnet below about 0.65 K from the measurements of magnetization of magnetic susceptibility and heat capacity.

Cited by 262 publications

References 12 publications

Prospects and Problems of Single Molecule Information Devices

Prospects and Problems of Single Molecule Information Devices

Spin density studies onp-O2NC6F4CNSSN: A heavypLuzón1, Campo2, Palácio3 et al. 2010Phys. Rev. B18090View full textAdd to dashboardCite

Spin-Density Map of the Triplet Ground State of a Titanium(IV) Complex with Schiff-Base Diquinone Radical Ligands: An Investigation Using Polarized-Neutron Diffraction and Density-Functional Theory

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Spin density studies onp-O2NC6F4CNSSN: A heavyp
Luzón
¹
,
Campo
²
,
Palácio
³

et al. 2010
Phys. Rev. B
18
0
9
0
View full text Add to dashboard Cite