Intensity and lifetime ratiometric luminescent thermometer based on a Tb(iii) coordination polymer.
COSTA, Augusto Iwashita; SILVA, Rafaela Maria Ribeiro da; BOTELHO, Luckerman; COELHO, Sergio Fernando Nunes; SIGOLI, Fernando Aparecido; HONORATO, João; ELLENA, Javier; MARTINS, Felipe Terra; GOMES, Angelo Marcio de Souza; NUNES, Wallace Castro; PASTOR, Francesc Lloret; JULVE, Miguel; MARINHO, Maria Vanda.
COSTA, Augusto Iwashita; SILVA, Rafaela Maria Ribeiro da; BOTELHO, Luckerman; COELHO, Sergio Fernando Nunes; SIGOLI, Fernando Aparecido; HONORATO, João; ELLENA, Javier; MARTINS, Felipe Terra; GOMES, Angelo Marcio de Souza; NUNES, Wallace Castro; PASTOR, Francesc Lloret; JULVE, Miguel; MARINHO, Maria Vanda.
Abstract: A three-dimensional terbium(III) coordination polymer of formula [Tb(bttb)0.5(2,5-pzdc)0.5]n (1) [H4bttb = 1,2,4,5-tetrakis(4'-carboxyphenyl)benzene and H2-2,5-pzdc = 2,5-pyrazinedicarboxylic acid] was obtained under hydrothermal conditions. The bttb4- tetraanion in 1 adopts the bridging and chelating-bridging pseudo-oxo coordination modes while the 2,5-pzdc2-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 (5D4 ? 7F5) with lifetimes at the millisecond scale. Thermometric performances of 1 reveal a maximum relative sensitivity (Sm) of 0.76% K-1 at 295 K (dT = 0.05 K), constituting a TbIII 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 mJ levels of the 7F7 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.
@article={003182759,author = {COSTA, Augusto Iwashita; SILVA, Rafaela Maria Ribeiro da; BOTELHO, Luckerman; COELHO, Sergio Fernando Nunes; SIGOLI, Fernando Aparecido; HONORATO, João; ELLENA, Javier; MARTINS, Felipe Terra; GOMES, Angelo Marcio de Souza; NUNES, Wallace Castro; PASTOR, Francesc Lloret; JULVE, Miguel; MARINHO, Maria Vanda.},title={Intensity and lifetime ratiometric luminescent thermometer based on a Tb(iii) coordination polymer},journal={Dalton Transactions},note={v. 53, n. 9, p. 3994-4004 + supplementary information},year={2024}}