| Texto completo | |
| Autor(es): Mostrar menos - |
Costa, Augusto Iwashita
;
da Silva, Rafaela M. R.
;
Botelho, Luckerman D. G.
;
Coelho, Sergio F. N.
;
Sigoli, Fernando A.
;
Honorato, Joao
;
Ellena, Javier
;
Martins, Felipe T.
;
Gomes, Angelo M.
;
Nunes, Wallace C.
;
Lloret, Francesc
;
Julve, Miguel
;
Marinho, Maria Vanda
Número total de Autores: 13
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| Tipo de documento: | Artigo Científico |
| Fonte: | DALTON TRANSACTIONS; v. 53, n. 9, p. 12-pg., 2024-01-03. |
| Resumo | |
A three-dimensional terbium(III) coordination polymer of formula [Tb(bttb)(0.5)(2,5-pzdc)(0.5)](n) (1) [H(4)bttb = 1,2,4,5-tetrakis(4'-carboxyphenyl)benzene and H-2-2,5-pzdc = 2,5-pyrazinedicarboxylic acid] was obtained under hydrothermal conditions. The bttb(4-) tetraanion in 1 adopts the bridging and chelating-bridging pseudo-oxo coordination modes while the 2,5-pzdc(2-) dianion exhibits a rather unusual bis-bidentate bridging pseudo-oxo coordination mode, both ligands being responsible for the stiffness of the resulting 3D structure. Solid-state photoluminescent measurements illustrate that 1 exhibits remarkable green luminescence emission, the most intense band occurring in the region of 550 nm (D-5(4) -> F-7(5)) with lifetimes at the millisecond scale. Thermometric performances of 1 reveal a maximum relative sensitivity (S-m) of 0.76% K-1 at 295 K (delta T = 0.05 K), constituting a Tb-III ratiometric solid luminescent thermometer over the physiological temperature range. Variable-temperature static (dc) magnetic susceptibility measurements for 1 in the temperature range 2.0-300 K show the expected behavior for the depopulation of the splitted m(J) levels of the F-7(7) ground state of the magnetically anisotropic terbium(III) ion plus a weak antiferromagnetic interaction through the carboxylate bridges. No significant out-of-phase magnetic susceptibility signals were observed for 1 in the temperature range 2.0-10.0 K, either in the absence or presence of a static dc magnetic field. (AU) | |
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