Near‐Infrared (NIR) Luminescence from Lanthanide(III) Complexes

Chen, Zhongning; Xu, Hai‐Bing

doi:10.1002/9780470824870.ch12

Cited by 5 publications

(8 citation statements)

References 160 publications

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“…The reference [TPE-TPY-Gd(hfac) 3 ], which lacks energy transfer from the TPE-TPY antenna triplet states, exhibits ligand phosphorescence as two vibronic shoulders at λ max = 452 and 475 nm, corresponding to the vibrational stretching frequency of the pyridyl groups ( Figure S4, SI ) 14 . The calculated triplet-state energy level (21100 cm −1 ) is favourable for energy transfer into that of Eu 3+ ( 5 D 0 , 17300 cm −1 ) 15 . However, the excitation spectrum of 1 ( Figure 1 , λ max = 310 nm, gray line) with a concentration of 10 −5 M only resembles the profile of the absorption spectrum of the precursor Eu(hfac) 3 ·2H 2 O rather than that of [TPY-Eu(NO 3 ) 3 ], indicating an energy transfer pathway is mainly from the hfac − instead of TPY to the Eu 3+ ion (the quantum efficiency ( η ) is ca.…”

Section: Resultsmentioning

confidence: 92%

“…We were naturally interested in the influence of different sensitizers in the Eu III -based emission intensities of 1 at different concentrations. It has been demonstrated that β -diketonates are one of the best sensitizers for Eu III -based emission in dilute solutions 15 20 25 . With hfac − acting as the main sensitizer for lanthanide emission in dilute solution (10 −5 M), the quantum yield ( Φ em ) of Eu III in 1 is 3.95 ± 0.15% ( Figure 5 ).…”

Section: Discussionmentioning

confidence: 99%

“…Due to the forbidden Laporte rule and low molar absorption coefficient, the lanthanide ions could only be efficiently populated by adjacent absorbing light harvesting, which act as the sensitizers to pump their energies into the lanthanide excited states by antenna effect 19 . Since the f-f′ transitions in lanthanide ion are inert 15 , the pumped excited energies from the sensitizer could be employed to modulate the performance of the sensitized lanthanide emissions 20 21 .…”

Section: Discussionmentioning

confidence: 99%

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Switchable sensitizers stepwise lighting up lanthanide emissions

Zhang

Jiao

et al. 2015

Sci Rep

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Analagous to a long-ranged rocket equipped with multi-stage engines, a luminescent compound with consistent emission signals across a large range of concentrations from two stages of sensitizers can be designed. In this approach, ACQ, aggregation-caused quenching effect of sensitizers, would stimulate lanthanide emission below 10−4 M, and then at concentrations higher than 10−3 M, the “aggregation-induced emission” (AIE) effect of luminophores would be activated with the next set of sensitizers for lanthanide emission. Simultaneously, the concentration of the molecules could be monitored digitally by the maximal excitation wavelengths, due to the good linear relationship between the maximal excitation wavelengths and the concentrations {lg(M)}. This model, wherein molecules are assembled with two stages (both AIE and ACQ effect) of sensitizers, may provide a practicable strategy for design and construction of smart lanthanide bioprobes, which are suitable in complicated bioassay systems in which concentration is variable.

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Section: Resultsmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Switchable sensitizers stepwise lighting up lanthanide emissions

Zhang

Jiao

et al. 2015

Sci Rep

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“…2 There is significant interest in developing novel materials whose excitation and emission wavelengths fall within the so-called second NIR window (1000−1350 nm), 3 where absorption by blood and water are minimal and damage-free deep tissue penetration is possible. 4 The use of the second NIR window allows for enhanced resolution of the vasculature in both normal limbs and tumors, 5 the imaging of lymphatic systems, 6 and the brain imaging of both tumors 6 and traumatic brain injury through the intact skull. 7 Known NIR-emitting fluorophores include organic dyes, 6,8 quantum dots, 9 and single-wall carbon nanotubes.…”

Section: Introductionmentioning

confidence: 99%

Multifunctional, Tunable Metal–Organic Framework Materials Platform for Bioimaging Applications

Gallis¹,

Rohwer²,

Rodriguez³

et al. 2017

ACS Appl. Mater. Interfaces

134

111

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Herein, we describe a novel multifunctional metal-organic framework (MOF) materials platform that displays both porosity and tunable emission properties as a function of the metal identity (Eu, Nd, and tuned compositions of Nd/Yb). Their emission collectively spans the deep red to near-infrared (NIR) spectral region (∼614-1350 nm), which is highly relevant for in vivo bioimaging. These new materials meet important prerequisites as relevant to biological processes: they are minimally toxic to living cells and retain structural integrity in water and phosphate-buffered saline. To assess their viability as optical bioimaging agents, we successfully synthesized the nanoscale Eu analog as a proof-of-concept system in this series. In vitro studies show that it is cell-permeable in individual RAW 264.7 mouse macrophage and HeLa human cervical cancer tissue culture cells. The efficient discrimination between the Eu emission and cell autofluorescence was achieved with hyperspectral confocal fluorescence microscopy, used here for the first time to characterize MOF materials. Importantly, this is the first report that documents the long-term conservation of the intrinsic emission in live cells of a fluorophore-based MOF to date (up to 48 h). This finding, in conjunction with the materials' very low toxicity, validates the biocompatibility in these systems and qualifies them as promising for use in long-term tracking and biodistribution studies.

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“…A luminescent behavior suitable for detection and quantification can only be observed upon excitation by UV irradiation, X-rays, fast electrons, neutrons and certain chemical or mechanical means. It has been noted that certain molecules can enhance the luminescence of lanthanides upon complexation by indirect excitation via a suitable chromophore moiety in the complex [38].…”

Section: Metal Complexes Of Quinolones With Lanthanide Ionsmentioning

confidence: 99%

Quinolone Complexes with Lanthanide Ions: An Insight into their Analytical Applications and Biological Activity

2020

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Quinolones comprise a series of synthetic bactericidal agents with a broad spectrum of activity and good bioavailability. An important feature of these molecules is their capacity to bind metal ions in complexes with relevant biological and analytical applications. Interestingly, lanthanide ions possess extremely attractive properties that result from the behavior of the internal 4f electrons, behavior which is not lost upon ionization, nor after coordination. Subsequently, a more detailed discussion about metal complexes of quinolones with lanthanide ions in terms of chemical and biological properties is made. These complexes present a series of characteristics, such as narrow and highly structured emission bands; large gaps between absorption and emission wavelengths (Stokes shifts); and long excited-state lifetimes, which render them suitable for highly sensitive and selective analytical methods of quantitation. Moreover, quinolones have been widely prescribed in both human and animal treatments, which has led to an increase in their impact on the environment, and therefore to a growing interest in the development of new methods for their quantitative determination. Therefore, analytical applications for the quantitative determination of quinolones, lanthanide and miscellaneous ions and nucleic acids, along with other applications, are reviewed here.

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Near‐Infrared (NIR) Luminescence from Lanthanide(III) Complexes

Cited by 5 publications

References 160 publications

Switchable sensitizers stepwise lighting up lanthanide emissions

Switchable sensitizers stepwise lighting up lanthanide emissions

Multifunctional, Tunable Metal–Organic Framework Materials Platform for Bioimaging Applications

Quinolone Complexes with Lanthanide Ions: An Insight into their Analytical Applications and Biological Activity

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