Heteronuclear {Tb: XEu1- x} furoate 1D polymers presenting luminescent properties and SMM behavior
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BARTOLOME, Bartolome; BARTOLOME, Juan; ARAUZO, A.; LUZON, Javier; CASES, Rafael; FUERTES, Sara; SICILIA, Violeta; SANCHEZ-CANO, Ana Isabel; APORTA, Justiniano; PRODIUS, Denis; MELNYK, Silvia; SHOVA, Sergiu. Heteronuclear {Tb: XEu1- x} furoate 1D polymers presenting luminescent properties and SMM behavior. In: Journal of Materials Chemistry C. 2018, nr. 6(19), pp. 5286-5299. ISSN 2050-7534.
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Journal of Materials Chemistry C
Numărul 6(19) / 2018 / ISSN 2050-7534

Heteronuclear {Tb: XEu1- x} furoate 1D polymers presenting luminescent properties and SMM behavior


DOI: 10.1039/c8tc00832a
Pag. 5286-5299

Bartolome Bartolome1, Bartolome Juan23, Arauzo A.34, Luzon Javier43, Cases Rafael3, Fuertes Sara3, Sicilia Violeta5, Sanchez-Cano Ana Isabel3, Aporta Justiniano3, Prodius Denis67, Melnyk Silvia6, Shova Sergiu8
 
1 Escola Universitària Salesiana de Sarrià (EUSS), Barcelona,
2 Instituto de Ciencia de Materiales, CSIC,
3 Universidad de Zaragoza, Zaragoza,
4 Centro Universitario de la Defensa, Academia General Militar, Zaragoza,
5 Escuela de Ingeniería y Arquitectura de Zaragoza,
6 Institute of Chemistry of the Academy of Sciences of Moldova,
7 Ames Laboratory, US Department of Energy and Critical Materials Institute, Ames, IA,
8 “Petru Poni” Institute of Macromolecular Chemistry
 
Disponibil în IBN: 21 iunie 2018


Rezumat

We report the synthesis, crystal structure and photo-magnetic properties of novel Tb/Eu polymeric complexes of general formula {TbxEu1-x(α-fur)3(H2O)3}n, supported by 2-furancarboxilic acid: the homonuclear Tb(iii) complex {Tb} (1), four heterodinuclear complexes, {Tb0.8Eu0.2} (2), {Tb0.7Eu0.3} (3), {Tb0.3Eu0.7} (4), and {Tb0.1Eu0.9} (5), and the homonuclear Eu(iii)-only complex {Eu} (6). X-ray diffraction experiments show that the α-furoate ligands, acting in bridging mode, consolidate the 1D polymeric chains along the c-axis. Luminescence studies show the sensitization capability of the furoic acid ligand. Color tuning from green to red can be successfully achieved through the heterodinuclear strategy. We have measured Eu emission by direct excitation at the resonant 7F05L6 (395 nm), and indirectly, by excitation of the non-resonant wavelength (280 nm) which provokes ligand → Tb → Eu energy transfer. Besides, ac susceptibility measurements under varying frequencies and temperatures reveal that mixed {TbxEu1-x} complexes exhibit field-induced slow relaxation dynamics, with extremely slow relaxation times, owing to direct processes affected by the bottleneck effect. Thus, the {TbxEu1-x} complexes represent interesting low-dimensional multifunctional materials combining both luminescent and SMM magnetic properties.

Cuvinte-cheie
crystal structure, ligands, Luminescence, magnetic susceptibility, Polymers,

energy transfer, Europium compounds, Relaxation processes, Synthesis (chemical)