The Experts below are selected from a list of 1215 Experts worldwide ranked by ideXlab platform
Shinichi Nakatsuji - One of the best experts on this subject based on the ideXlab platform.
-
novel purely organic conductor with an Aminoxyl radical α bedt ttf 2 po conhch2so3 2h2o po 2 2 5 5 tetramethyl 3 pyrrolin 1 oxyl free radical
Chemistry Letters, 2008Co-Authors: Hiroki Akutsu, Shinji Yamashita, Junichi Yamada, Shinichi Nakatsuji, Scott S TurnerAbstract:A novel bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF)-based salt with an Aminoxyl radical 2,2,5,5-tetramethyl-3-pyrrolin-1-oxyl (PO) has been prepared. The salt has α-type 2-D conducting sheets and is a semiconductor with ρ = 26 Ω·cm and E = 0.31 eV. The temperature dependence of the magnetic susceptibility suggests that both the Aminoxyl radical and the BEDT-TTF layer have local spin moments at room temperature. Copyright © 2008 The Chemical Society of Japan.
-
Novel Purely Organic Conductor with an Aminoxyl Radical, α-(BEDT-TTF)2(PO–CONHCH2SO3)·2H2O (PO = 2,2,5,5-Tetramethyl-3-pyrrolin-1-oxyl Free Radical)
Chemistry Letters, 2008Co-Authors: Hiroki Akutsu, Shinji Yamashita, Junichi Yamada, Shinichi Nakatsuji, Scott S TurnerAbstract:A novel bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF)-based salt with an Aminoxyl radical 2,2,5,5-tetramethyl-3-pyrrolin-1-oxyl (PO) has been prepared. The salt has α-type 2-D conducting sheets and is a semiconductor with ρ = 26 Ω·cm and E = 0.31 eV. The temperature dependence of the magnetic susceptibility suggests that both the Aminoxyl radical and the BEDT-TTF layer have local spin moments at room temperature. Copyright © 2008 The Chemical Society of Japan.
-
organic multifunctional spin systems based on Aminoxyl radicals
Advanced Materials, 2001Co-Authors: Shinichi NakatsujiAbstract:Recent advances in the development of organic multifunctional spin systems are described. This includes systems with carrier transport properties, photo-functionality, liquid crystallinity, and pressure functionality in which Aminoxyl (nitroxide) radicals play a crucial roll.
-
Aminoxyl radicals bearing a mesogenic core
Tetrahedron Letters, 2001Co-Authors: Hiroshi Ikemoto, Hiroki Akutsu, Junichi Yamada, Shinichi NakatsujiAbstract:Abstract A series of Aminoxyl radicals (nitronyl nitroxide or TEMPO) bearing biphenylcarbonitrile as a mesogenic core ( 2a–2c and 3a–3c ) was prepared. Among them, unusual magnetic transition from the original Curie–Weiss phase to another magnetic phase well expressed by a singlet–triplet model was found in the 4′-undecyloxy-4-biphenylcarbonitrile derivative with oxocarbonyl-TEMPO through the thermal transition.
Andrzej Rajca - One of the best experts on this subject based on the ideXlab platform.
-
triplet ground state s 1 pegylated bis Aminoxyl diradical synthesis and the effect of water on magnetic properties
Chemical Communications, 2005Co-Authors: Gaelle Spagnol, Suchada Rajca, Kouichi Shiraishi, Andrzej RajcaAbstract:The synthesis and magnetic characterization of pegylated bis(Aminoxyl) diradical with an S = 1 ground state are presented, revealing water-induced changes in the molecular conformation and magnetic properties.
-
4,6-Bis(trifluoromethyl)-N,N′-di-tert-butyl-1,3-phenylenebis(Aminoxyl) and its bis(hexafluoroacetylacetonato)manganese(II) complex: synthesis, X-ray crystallography, and magnetism
Polyhedron, 2001Co-Authors: Andrzej Rajca, Suchada Rajca, Jirawat Wongsriratanakul, Charles R. RossAbstract:Abstract Synthesis, crystallography, and magnetic characterization of bis(Aminoxyl) 1 and its 2:1 complex with Mn(hfac)2 (2) are described. X-ray structure of 2 (at 20 K) provides one of the rare examples of discrete molecules found for the complexes of Mn(hfac)2 and bis(Aminoxyls). The differences in conformations of the bis(Aminoxyl) moieties in 1 and 2 lead to ferromagnetic and antiferromagnetic exchange coupling through the 1,3-phenylene moiety, in 1 and 2, respectively, as determined by SQUID susceptometry. DFT calculations (at the crystallographic geometries) give the triplet and the singlet ground states for 1 and for bis(Aminoxyl) in 2, respectively. Two analogous conformations of the bis(Aminoxyl) are proposed to be responsible for the unprecedented S-shaped time dependence for the conversion from the singlet to the triplet state of 1 in 2-methyltetrahydrofuran.
-
4 6 bis trifluoromethyl n n di tert butyl 1 3 phenylenebis Aminoxyl and its bis hexafluoroacetylacetonato manganese ii complex synthesis x ray crystallography and magnetism
Polyhedron, 2001Co-Authors: Andrzej Rajca, Suchada Rajca, Jirawat Wongsriratanakul, Charles R. RossAbstract:Abstract Synthesis, crystallography, and magnetic characterization of bis(Aminoxyl) 1 and its 2:1 complex with Mn(hfac)2 (2) are described. X-ray structure of 2 (at 20 K) provides one of the rare examples of discrete molecules found for the complexes of Mn(hfac)2 and bis(Aminoxyls). The differences in conformations of the bis(Aminoxyl) moieties in 1 and 2 lead to ferromagnetic and antiferromagnetic exchange coupling through the 1,3-phenylene moiety, in 1 and 2, respectively, as determined by SQUID susceptometry. DFT calculations (at the crystallographic geometries) give the triplet and the singlet ground states for 1 and for bis(Aminoxyl) in 2, respectively. Two analogous conformations of the bis(Aminoxyl) are proposed to be responsible for the unprecedented S-shaped time dependence for the conversion from the singlet to the triplet state of 1 in 2-methyltetrahydrofuran.
-
Singlet–triplet bistability in a 1,3-phenylene-based bis(Aminoxyl) diradical
Chemical Communications, 1999Co-Authors: Andrzej Rajca, Suchada Rajca, Kan Lu, Charles R. RossAbstract:Rapid quenching of the title bis(Aminoxyl) 1 in 2-methyltetrahydrofuran from ambient temperature to cryogenic temperatures (5 K or below) produces 1 in its singlet state, which slowly converts at low temperatures, with an S-shaped time-dependence, to the triplet ground state.
-
Singlet-triplet bistability in a 1,3-phenylene-based bis(Aminoxyl) diradical
Chemical Communications, 1999Co-Authors: Andrzej Rajca, Suchada Rajca, Kan Lu, Charles R. RossAbstract:Rapid quenching of the title bis(Aminoxyl) 1 in 2-methyltetrahydrofuran from ambient temperature to cryogenic temperatures (5 K or below) produces 1 in its singlet state, which slowly converts at low temperatures, with an S-shaped time-dependence, to the triplet ground state.
Gianfranco Scorrano - One of the best experts on this subject based on the ideXlab platform.
-
Time-resolved EPR characterisation of radical–triplet pairs formed by host–guest interaction of a photoexcited C60–crown ether with an ammonium Aminoxyl in liquid solution
Chemical Communications, 2020Co-Authors: Elena Sartori, Luigi Garlaschelli, Antonio Toffoletti, Carlo Corvaja, Michele Maggini, Gianfranco ScorranoAbstract:A time resolved EPR (TR-EPR) spectrum of a radical–triplet pair (RTP) in the quartet excited state has been recorded by irradiating with visible laser light a solution of a [60]fullerene–crown ether conjugate and an ammonium Aminoxyl radical; this is the first direct observation of a RTP in liquid solution for a stable host–guest complex between a macrocyclic ligand bearing a triplet precursor and an Aminoxyl ammonium cation.
-
time resolved epr characterisation of radical triplet pairs formed by host guest interaction of a photoexcited c60 crown ether with an ammonium Aminoxyl in liquid solution
Chemical Communications, 2001Co-Authors: Elena Sartori, Luigi Garlaschelli, Antonio Toffoletti, Carlo Corvaja, Michele Maggini, Gianfranco ScorranoAbstract:A time resolved EPR (TR-EPR) spectrum of a radical–triplet pair (RTP) in the quartet excited state has been recorded by irradiating with visible laser light a solution of a [60]fullerene–crown ether conjugate and an ammonium Aminoxyl radical; this is the first direct observation of a RTP in liquid solution for a stable host–guest complex between a macrocyclic ligand bearing a triplet precursor and an Aminoxyl ammonium cation.
Paul M Lahti - One of the best experts on this subject based on the ideXlab platform.
-
chain versus dimer contacts in crystalline 5 4 n tert butyl n Aminoxyl phenyl pyrimidine radicals choices among competing intermolecular exchange mechanisms
Polyhedron, 2005Co-Authors: Lora M Field, Paul M LahtiAbstract:Abstract 5-(4-[N-Tert-butyl-N-Aminoxyl]phenyl)pyrimidine crystallographically exhibits alternating chains and in-plane dimers involving two distinct molecular geometries, plus dimeric stacking of only one of the forms. Its magnetic behavior is neither fully spin pairing nor chain-like, but rather shows low temperature spin pairing for half of molecules in the unit cell with J/k = (−)130 J/mol, consistent with dominating exchange behavior of the dimerically π-stacked form. The other molecules in the unit cell behave in an essentially paramagnetic manner.
-
1 1 complexes of 5 4 n tert butyl n Aminoxyl phenyl pyrimidine with manganese ii and copper ii hexafluoroacetonylacetonate
Chemical Communications, 2002Co-Authors: Lora M Field, Paul M Lahti, Fernando PalacioAbstract:Mn(hfac)2 and Cu(hfac)2 form 1∶1 complexes with 5-(4-[N-tert-butyl-N-Aminoxyl]phenyl)pyrimidine that exhibit strong metal–nitroxide exchange; spin polarization models do not explain the antiferromagnetic exchange behavior between spin sites in these complexes.
Lora M Field - One of the best experts on this subject based on the ideXlab platform.
-
chain versus dimer contacts in crystalline 5 4 n tert butyl n Aminoxyl phenyl pyrimidine radicals choices among competing intermolecular exchange mechanisms
Polyhedron, 2005Co-Authors: Lora M Field, Paul M LahtiAbstract:Abstract 5-(4-[N-Tert-butyl-N-Aminoxyl]phenyl)pyrimidine crystallographically exhibits alternating chains and in-plane dimers involving two distinct molecular geometries, plus dimeric stacking of only one of the forms. Its magnetic behavior is neither fully spin pairing nor chain-like, but rather shows low temperature spin pairing for half of molecules in the unit cell with J/k = (−)130 J/mol, consistent with dominating exchange behavior of the dimerically π-stacked form. The other molecules in the unit cell behave in an essentially paramagnetic manner.
-
1 1 complexes of 5 4 n tert butyl n Aminoxyl phenyl pyrimidine with manganese ii and copper ii hexafluoroacetonylacetonate
Chemical Communications, 2002Co-Authors: Lora M Field, Paul M Lahti, Fernando PalacioAbstract:Mn(hfac)2 and Cu(hfac)2 form 1∶1 complexes with 5-(4-[N-tert-butyl-N-Aminoxyl]phenyl)pyrimidine that exhibit strong metal–nitroxide exchange; spin polarization models do not explain the antiferromagnetic exchange behavior between spin sites in these complexes.