Electronic structure, insulator-metal transition and superconductivity in K-ET2X salts

The electronic structure and superconductivity of layered organic materials based on the bis(ethylenedithio)tetrathiafulvalene molecule (BEDT-TTF, hereafter ET) with essential intra-ET correlations of electrons are analysed. Taking into account the Fermi surface topology, the superconducting electronic density of states (DOS) is calculated for a realistic model of K-ET2X salts. A d-symmetry of the superconducting order parameter is obtained and a relation is found between its nodes on the Fermi surface and the superconducting phase characteristics. The results are in agreement with the measured non-activated temperature dependences of the superconducting specific heat and NMR relaxation rate of central 13C atoms in ET. © 1998 John Wiley & Sons, Ltd

Osmium dimethyl sulfoxide complexes: Synthesis and properties of [H(dmso)2][OsIII(dmso)2Br4]

The reaction of H2[OsBr6] with DMSO in ethanol solution resulted in DMSO complex [H(dmso-O)2][OsIII(dmso- S)2Br4] (1) described previously as an intermediate product in the reaction of K2[OsBr6] with DMSO and characterized by EAS and ESR spectra. The coordination of DMSO molecules was established by IR and 1H and 13C NMR spectroscopy. The oxidation state of osmium and trans arrangement of DMSO molecules in the anion were established by ESR. The behavior of complex 1 in solutions was studied by EAS, ESR, and mass-spectrometry: a displacement of Br- ions accompanied by the reduction of osmium to oxidation state +2 occurs in DMSO, a solvation with displacement of DMSO molecules is observed at the first stage in water and methanol (rate constants 2.3 × 10-4 and 1.7 × 10-3 s-1, respectively), the sequential substitution of DMSO molecules and osmium oxidation to form [OsIVBr6] 2- ions takes place in 4 mol/L HBr. © 2014 Pleiades Publishing, Ltd

Диметилсульфоксидные комплексы осмия. Синтез и свойства [H(DMSO)2][OsIII(dmso-S)2Br4]

The reaction of H2[OsBr6] with DMSO in ethanol solution resulted in DMSO complex [H(dmso-O)2][OsIII(dmso-S)2Br4] (1) described previously as an intermediate product in the reaction of K2[OsBr6] with DMSO and characterized by EAS and ESR spectra. The coordination of DMSO molecules was established by IR and 1H and 13C NMR spectroscopy. The oxidation state of osmium and trans arrangement of DMSO molecules in the anion were established by ESR. The behavior of complex 1 in solutions was studied by EAS, ESR, and mass-spectrometry: a displacement of Br− ions accompanied by the reduction of osmium to oxidation state +2 occurs in DMSO, a solvation with displacement of DMSO molecules is observed at the first stage in water and methanol (rate constants 2.3 × 10−4 and 1.7 × 10−3 s−1, respectively), the sequential substitution of DMSO molecules and osmium oxidation to form [OsIVBr6]2− ions takes place in 4 mol/L HBr.В результате взаимодействия H2[OsBr6] с ДМСО в этанольном растворе выделен комплекс [H(dmso-О)2][OsIII(dmso-S)2Br4] (1), описанный ранее как промежуточный продукт реакции K2[OsBr6] с ДМСО и охарактеризованный спектрами ЭСП и ЭПР. Координация молекул ДМСО установлена методами ИК-спектроскопии и ЯМР 1 и 13. Степень окисления осмия и транс-расположение молекул ДМСО в анионе установлены методом ЭПР. Методами ЭСП, ЭПР и масс-спектрометрии изучено поведение комплекса 1 в растворах: в ДМСО происходит замещение Br--ионов, сопровождающееся восстановлением осмия до с.о. +2; в воде и метаноле на первой стадии наблюдается сольватация с замещением молекулы ДМСО (константы скорости 2.3 ? 10-4 и 1.7 ? 10-3 с-1 соответственно); в 4 моль/л HBr последовательное замещение молекул ДМСО и окисление осмия с образованием [OsIVBr6]2-ионов

Osmium dimethyl sulfoxide complexes: Synthesis and properties of [H(dmso)2][OsIII(dmso)2Br4]

The reaction of H2[OsBr6] with DMSO in ethanol solution resulted in DMSO complex [H(dmso-O)2][OsIII(dmso- S)2Br4] (1) described previously as an intermediate product in the reaction of K2[OsBr6] with DMSO and characterized by EAS and ESR spectra. The coordination of DMSO molecules was established by IR and 1H and 13C NMR spectroscopy. The oxidation state of osmium and trans arrangement of DMSO molecules in the anion were established by ESR. The behavior of complex 1 in solutions was studied by EAS, ESR, and mass-spectrometry: a displacement of Br- ions accompanied by the reduction of osmium to oxidation state +2 occurs in DMSO, a solvation with displacement of DMSO molecules is observed at the first stage in water and methanol (rate constants 2.3 × 10-4 and 1.7 × 10-3 s-1, respectively), the sequential substitution of DMSO molecules and osmium oxidation to form [OsIVBr6] 2- ions takes place in 4 mol/L HBr. © 2014 Pleiades Publishing, Ltd

Диметилсульфоксидные комплексы осмия. Синтез и свойства [H(DMSO)2][OsIII(dmso-S)2Br4]

The reaction of H2[OsBr6] with DMSO in ethanol solution resulted in DMSO complex [H(dmso-O)2][OsIII(dmso-S)2Br4] (1) described previously as an intermediate product in the reaction of K2[OsBr6] with DMSO and characterized by EAS and ESR spectra. The coordination of DMSO molecules was established by IR and 1H and 13C NMR spectroscopy. The oxidation state of osmium and trans arrangement of DMSO molecules in the anion were established by ESR. The behavior of complex 1 in solutions was studied by EAS, ESR, and mass-spectrometry: a displacement of Br− ions accompanied by the reduction of osmium to oxidation state +2 occurs in DMSO, a solvation with displacement of DMSO molecules is observed at the first stage in water and methanol (rate constants 2.3 × 10−4 and 1.7 × 10−3 s−1, respectively), the sequential substitution of DMSO molecules and osmium oxidation to form [OsIVBr6]2− ions takes place in 4 mol/L HBr.В результате взаимодействия H2[OsBr6] с ДМСО в этанольном растворе выделен комплекс [H(dmso-О)2][OsIII(dmso-S)2Br4] (1), описанный ранее как промежуточный продукт реакции K2[OsBr6] с ДМСО и охарактеризованный спектрами ЭСП и ЭПР. Координация молекул ДМСО установлена методами ИК-спектроскопии и ЯМР 1 и 13. Степень окисления осмия и транс-расположение молекул ДМСО в анионе установлены методом ЭПР. Методами ЭСП, ЭПР и масс-спектрометрии изучено поведение комплекса 1 в растворах: в ДМСО происходит замещение Br--ионов, сопровождающееся восстановлением осмия до с.о. +2; в воде и метаноле на первой стадии наблюдается сольватация с замещением молекулы ДМСО (константы скорости 2.3 ? 10-4 и 1.7 ? 10-3 с-1 соответственно); в 4 моль/л HBr последовательное замещение молекул ДМСО и окисление осмия с образованием [OsIVBr6]2-ионов

A new heterometallic pivalate {Fe<inf>8</inf>Cd} complex as an example of unusual "ferric wheel" molecular self-assembly

© 2020 The Royal Society of Chemistry. The interaction of the pivalate complexes of iron(iii), [Fe3O(Piv)6(H2O)3]·HPiv, and cadmium(ii), [Cd(Piv)2], in Et2O resulted in one more type of "ferric wheel"family complex, namely [Fe8(Piv)16{Cd(Piv)2}(μ-OH)8]·Et2O (1). The complex is an octanuclear iron(iii) wheel with a {Cd(Piv)2} moiety asymmetrically incorporated into the ring

Vanadium (IV), (V) coordination compounds with 8-hydroxyquinoline derivative: Synthesis, structure and catalytic activity in the polymerization of ethylene

A series of oxovanadium (IV, V) complexes stabilized by [OON]2- type ligand - 7- (hexafluoro-2-hydroxypropane-2-yl)-8-hydroxyquinoline (2), have been synthesized in high yields; the structures were confirmed by NMR, EPR, and IR spectroscopy, mass spectrometry, X-ray diffraction and elemental analysis. Depending on reaction conditions di-, tetra- or hexanuclear complexes 3-5 were obtained. It was demonstrated that in the presence of Et2AlCl/CCl3CO2Et, vanadium (V) complexes catalyzed polymerization of ethylene with activities up to 1000 kg of PE (mol of V)-1 h-1 atm-1. © 2015 Published by Elsevier B.V

Vanadium (IV), (V) coordination compounds with 8-hydroxyquinoline derivative: Synthesis, structure and catalytic activity in the polymerization of ethylene

A series of oxovanadium (IV, V) complexes stabilized by [OON]2- type ligand - 7- (hexafluoro-2-hydroxypropane-2-yl)-8-hydroxyquinoline (2), have been synthesized in high yields; the structures were confirmed by NMR, EPR, and IR spectroscopy, mass spectrometry, X-ray diffraction and elemental analysis. Depending on reaction conditions di-, tetra- or hexanuclear complexes 3-5 were obtained. It was demonstrated that in the presence of Et2AlCl/CCl3CO2Et, vanadium (V) complexes catalyzed polymerization of ethylene with activities up to 1000 kg of PE (mol of V)-1 h-1 atm-1. © 2015 Published by Elsevier B.V