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A Mononuclear Uranium(IV) Single-Molecule Magnet with an Azobenzene Radical Ligand

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A Mononuclear Uranium(IV) Single-Molecule Magnet with an Azobenzene Radical Ligand

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dc.contributor.author	Antunes, Maria A.
dc.contributor.author	Coutinho, Joana T.
dc.contributor.author	Santos, Isabel C.
dc.contributor.author	Marçalo, Joaquim
dc.contributor.author	Almeida, Manuel
dc.contributor.author	Baldoví, José J.
dc.contributor.author	Pereira, Laura C. J.
dc.contributor.author	Gaita Ariño, Alejandro
dc.contributor.author	Coronado Miralles, Eugenio
dc.date.accessioned	2021-05-07T08:15:26Z
dc.date.available	2021-05-08T04:45:05Z
dc.date.issued	2015	es_ES
dc.identifier.citation	Maria A. Antunes, Joana T. Coutinho, Isabel C. Santos, Joaquim Marçalo, Manuel Almeida, José J. Baldoví, Laura C. J. Pereira, Alejandro Gaita-Ariño, Eugenio Coronado, Chemistry: A European Journal, 2015, 21 (49) 17817-17826	es_ES
dc.identifier.uri	https://hdl.handle.net/10550/79243
dc.description.abstract	A tetravalent uranium compound with a radical azobenzene ligand, namely, [{(SiMe2NPh)3‐tacn}UIV(η2‐N2Ph2.)] (2), was obtained by one‐electron reduction of azobenzene by the trivalent uranium compound [UIII{(SiMe2NPh)3‐tacn}] (1). Compound 2 was characterized by single‐crystal X‐ray diffraction and 1H NMR, IR, and UV/Vis/NIR spectroscopy. The magnetic properties of 2 and precursor 1 were studied by static magnetization and ac susceptibility measurements, which for the former revealed single‐molecule magnet behaviour for the first time in a mononuclear UIV compound, whereas trivalent uranium compound 1 does not exhibit slow relaxation of the magnetization at low temperatures. A first approximation to the magnetic behaviour of these compounds was attempted by combining an effective electrostatic model with a phenomenological approach using the full single‐ion Hamiltonian.	es_ES
dc.description.abstract	A tetravalent uranium compound with a radical azobenzene ligand, namely, [{(SiMe2NPh)3‐tacn}UIV(η2‐N2Ph2.)] (2), was obtained by one‐electron reduction of azobenzene by the trivalent uranium compound [UIII{(SiMe2NPh)3‐tacn}] (1). Compound 2 was characterized by single‐crystal X‐ray diffraction and 1H NMR, IR, and UV/Vis/NIR spectroscopy. The magnetic properties of 2 and precursor 1 were studied by static magnetization and ac susceptibility measurements, which for the former revealed single‐molecule magnet behaviour for the first time in a mononuclear UIV compound, whereas trivalent uranium compound 1 does not exhibit slow relaxation of the magnetization at low temperatures. A first approximation to the magnetic behaviour of these compounds was attempted by combining an effective electrostatic model with a phenomenological approach using the full single‐ion Hamiltonian.	en_US
dc.language.iso	en	es_ES
dc.title	A Mononuclear Uranium(IV) Single-Molecule Magnet with an Azobenzene Radical Ligand	es_ES
dc.type	journal article	es_ES
dc.subject.unesco	UNESCO::QUÍMICA	es_ES
dc.identifier.doi	10.1002/chem.201503133	es_ES
dc.identifier.idgrec	109963	es_ES
dc.accrualmethod	-	es_ES
dc.embargo.terms	0 days	es_ES
dc.relation.projectID	FCT/Grant Number: UID/Multi/04349/2013	es_ES
dc.relation.projectID	FCT (Portugal)/Grant Numbers: SFRH/BD/84628/2012, SFRH/BPD/74194/2010	es_ES
dc.relation.projectID	FCT (Portugal)/Grant Number: PTDC/QEQ‐SUP/1413/2012	es_ES
dc.relation.projectID	FCT (Portugal)/Grant Number: RECI/QEQ‐QIN/0189/2012	es_ES
dc.relation.projectID	SPINMOL/FP7-ERC-247384	es_ES
dc.relation.projectID	ERC-2014-CoG-647301 DECRESIM	es_ES
dc.relation.projectID	MAT2011‐22785	es_ES