Metallomesogens Ln（bta）3L2 （Ln^3＋： La^3＋, Eu^3＋, and Ho^3＋; bta： benzoyltrifluoroacetonate; L： Schiff base） were prepared. Photoacoustic （PA） spectroscopy was used to study physicochemical properties of t...Metallomesogens Ln（bta）3L2 （Ln^3＋： La^3＋, Eu^3＋, and Ho^3＋; bta： benzoyltrifluoroacetonate; L： Schiff base） were prepared. Photoacoustic （PA） spectroscopy was used to study physicochemical properties of the liquid crystalline metal complexes. In the region of ligand absorption, PA intensity increases for Eu（bta）3L2, La（bta）3L2, and Ho（bta）3L2, in that order. It is found that the PA intensity of the ligand bears a relation to the intramolecular energy transfer process. For the first time, phase transitions of Eu（bta）3L2 from glass state to smectic A （SmA） phase and SmA phase to isotropic liquid are monitored by PA and fluorescence （FL） spectroscopy from two aspects： nonradiative and radiative transitions. The results show that PA technique may serve as a new tool for investigating the spectral properties and phase transitions of liquid crystals containing metal ions.展开更多
Luminescent biosensing in the second nearinfrared(NIR-II) region is featured with superior spatial resolution and high penetration depth by virtue of the suppressed scattering of long-wavelength photons. Hitherto, the...Luminescent biosensing in the second nearinfrared(NIR-II) region is featured with superior spatial resolution and high penetration depth by virtue of the suppressed scattering of long-wavelength photons. Hitherto, the reported NIR-II nanoprobes are mostly based on carbon nanotubes, organic fluorophores or semiconducting quantum dots. As an alternative, trivalent lanthanide ions(Ln3+) doped nanoparticles have been emerging as a novel class of promising nanoprobes. In this review, we highlight the recent progress in the design of highly efficient Ln3+-doped NIR-II nanoparticles towards their emerging bioapplications, with an emphasis on autofluorescence-free bioimaging, sensitive bioassay, and accurate temperature sensing. Moreover, some efforts and challenges towards this rapidly expanding field are envisioned.展开更多
基金This work was supported by the National Natural Science Foundation of China （No.10574073 and No.10574071）. Financial support by the K. U. Leuven （No.GOA 03/03） is gratefully acknowledged.
文摘Metallomesogens Ln（bta）3L2 （Ln^3＋： La^3＋, Eu^3＋, and Ho^3＋; bta： benzoyltrifluoroacetonate; L： Schiff base） were prepared. Photoacoustic （PA） spectroscopy was used to study physicochemical properties of the liquid crystalline metal complexes. In the region of ligand absorption, PA intensity increases for Eu（bta）3L2, La（bta）3L2, and Ho（bta）3L2, in that order. It is found that the PA intensity of the ligand bears a relation to the intramolecular energy transfer process. For the first time, phase transitions of Eu（bta）3L2 from glass state to smectic A （SmA） phase and SmA phase to isotropic liquid are monitored by PA and fluorescence （FL） spectroscopy from two aspects： nonradiative and radiative transitions. The results show that PA technique may serve as a new tool for investigating the spectral properties and phase transitions of liquid crystals containing metal ions.
基金supported by the Strategic Priority Research Program of the CAS(XDB20000000)the National Natural Science Foundation of China(21771185,11704380,51672272,21804134and U1805252)+1 种基金the CAS/SAFEA International Partnership Program for Creative Research Teamsthe Natural Science Foundation of Fujian Province(2017I0018)
文摘Luminescent biosensing in the second nearinfrared(NIR-II) region is featured with superior spatial resolution and high penetration depth by virtue of the suppressed scattering of long-wavelength photons. Hitherto, the reported NIR-II nanoprobes are mostly based on carbon nanotubes, organic fluorophores or semiconducting quantum dots. As an alternative, trivalent lanthanide ions(Ln3+) doped nanoparticles have been emerging as a novel class of promising nanoprobes. In this review, we highlight the recent progress in the design of highly efficient Ln3+-doped NIR-II nanoparticles towards their emerging bioapplications, with an emphasis on autofluorescence-free bioimaging, sensitive bioassay, and accurate temperature sensing. Moreover, some efforts and challenges towards this rapidly expanding field are envisioned.
