0000000001298877

AUTHOR

Nikolaos Tsoureas

showing 5 related works from this author

Isolation of a perfectly linear uranium(II) metallocene

2020

Reduction of the uranium(III) metallocene [(eta(5)-(C5Pr5)-Pr-i)(2)UI] (1) with potassium graphite produces the "second-generation" uranocene [(eta(5)-(C5Pr5)-Pr-i)(2)U] (2), which contains uranium in the formal divalent oxidation state. The geometry of 2 is that of a perfectly linear bis(cyclopentadienyl) sandwich complex, with the ground-state valence electron configuration of uranium(II) revealed by electronic spectroscopy and density functional theory to be 5f(3) 6d(1). Appreciable covalent contributions to the metal-ligand bonds were determined from a computational study of 2, including participation from the uranium 5f and 6d orbitals. Whereas three unpaired electrons in 2 occupy orbi…

Materials sciencemagneettiset ominaisuudetchemistry.chemical_elementorganometalliyhdisteet010402 general chemistry01 natural sciencesElectron spectroscopyCatalysisuraniumchemistry.chemical_compoundkemialliset sidoksetUranoceneCyclopentadienyl complex010405 organic chemistrychemical bondingGeneral MedicineGeneral ChemistryUraniummetalloceneselectronic structure0104 chemical sciencesCrystallographychemistryUnpaired electronuraaniDensity functional theorymagnetic propertiesQD0146Valence electronMetallocene
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Uranium( iv ) cyclobutadienyl sandwich compounds: synthesis, structure and chemical bonding

2019

The 1 : 1 reactions of uranium(IV) tetrakis(borohydride) with the sodium and potassium salts of the cyclobutadienyl anion [C4(SiMe3)4]2− (Cb′′′′) produce the half-sandwich complexes [Na(12-crown-4)2][U(η4-Cb′′′′)(BH4)3] and [U(η4-Cb′′′′)(μ-BH4)3{K(THF)2}]2. In the 1 : 2 reaction of U(BH4)4 with Na2Cb′′′′, formation of [U(η4-Cb′′′′)(η3-C4H(SiMe3)3-κ-(CH2SiMe2)(BH4))]− reveals that a Cb′′′′ ligand undergoes an intramolecular deprotonation, resulting in an allyl/tuck-in bonding mode. A computational study reveals that the uranium–Cb′′′′ bonding has an appreciable covalent component with contributions from the uranium 5f and 6d orbitals. peerReviewed

chemistry.chemical_element010402 general chemistryBorohydride01 natural sciencesMedicinal chemistryCatalysisIonkemialliset sidoksetchemistry.chemical_compoundDeprotonationMaterials Chemistrykemiallinen synteesi010405 organic chemistryLigandChemistryMetals and AlloyskompleksiyhdisteetGeneral ChemistryUranium3. Good health0104 chemical sciencesSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsuraaniChemical bondCovalent bondIntramolecular forceCeramics and CompositesChemical Communications
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CCDC 1966630: Experimental Crystal Structure Determination

2019

Related Article: Nikolaos Tsoureas, Akseli Mansikkamäki, Richard A. Layfield|2020|Chem.Commun.|56|944|doi:10.1039/C9CC09018E

Space GroupCrystallographytetrakis(2-methoxy-2-methylpropane)-sodium tris(2-methoxy-2-methylpropane)-tetrahydrofuran-sodium ((cyclobuta-13-diene-1234-tetrayl)tetrakis(trimethylsilane))-(3-[methyl(dimethyl)silyl]-124-tris(trimethylsilyl)cyclobut-2-en-1-yl)-tetrahydridoborato-uraniumCrystal SystemCrystal StructureCell ParametersExperimental 3D Coordinates
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CCDC 1966628: Experimental Crystal Structure Determination

2019

Related Article: Nikolaos Tsoureas, Akseli Mansikkamäki, Richard A. Layfield|2020|Chem.Commun.|56|944|doi:10.1039/C9CC09018E

Space GroupCrystallographyCrystal SystemCrystal StructureCell Parametersbis(14710-tetraoxacyclododecane-O1O4O7O10)-sodium ((cyclobuta-13-diene-1234-tetrayl)tetrakis(trimethylsilane)) tris(tetrahydridoborato)-uraniumExperimental 3D Coordinates
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CCDC 1966629: Experimental Crystal Structure Determination

2019

Related Article: Nikolaos Tsoureas, Akseli Mansikkamäki, Richard A. Layfield|2020|Chem.Commun.|56|944|doi:10.1039/C9CC09018E

Space GroupCrystallographyCrystal SystemCrystal StructureCell ParametersExperimental 3D Coordinatestetrakis(mu-tetrahydridoborato)-bis(tetrahydridoborato)-bis((cyclobuta-13-diene-1234-tetrayl)tetrakis(trimethylsilane))-tetrakis(tetrahydrofuran)-di-potassium-di-uranium
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