Lanthanide ion probes of structure in biology. Laser-induced luminescence decay constants provide a direct measure of the number of metal-coordinated water molecules

Horrocks, William DeW.; Sudnick, Daniel R.

doi:10.1021/ja00496a010

Cited by 1,354 publications

(1,027 citation statements)

References 13 publications

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“…Along with concentration quenching, other factors such as surface hydroxyls (-OH) and defects in the volume like mesopores filled by the -OH groups are responsible for nonradiative losses in rare earth-doped materials which lead to reduced fluorescence lifetimes. [49][50][51][52] Since neither Nd 3þ concentrations nor surface treatments are the same in all the Nd:NPs studied in this work, the average lifetime values given in Table III do not constitute a general comparison table but rather a comparison of the fluorescence lifetimes of assynthesized Nd:NPs. Despite it cannot be considered as a general comparison table, some general trend can be extracted from data included in Table III.…”

Section: Fluorescence Lifetimesmentioning

confidence: 99%

Neodymium-doped nanoparticles for infrared fluorescence bioimaging: The role of the host

Rosal

Pérez‐Delgado

Misiak

et al. 2015

Journal of Applied Physics

113

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The spectroscopic properties of different infrared-emitting neodymium-doped nanoparticles (LaF 3 :Nd 3þ , SrF 2 :Nd 3þ , NaGdF 4 : Nd 3þ , NaYF 4 : Nd 3þ , KYF 4 : Nd 3þ , GdVO 4 : Nd 3þ , and Nd:YAG) have been systematically analyzed. A comparison of the spectral shapes of both emission and absorption spectra is presented, from which the relevant role played by the host matrix is evidenced. The lack of a "universal" optimum system for infrared bioimaging is discussed, as the specific bioimaging application and the experimental setup for infrared imaging determine the neodymiumdoped nanoparticle to be preferentially used in each case. V C 2015 AIP Publishing LLC.

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Section: Fluorescence Lifetimesmentioning

confidence: 99%

Neodymium-doped nanoparticles for infrared fluorescence bioimaging: The role of the host

Rosal

Pérez‐Delgado

Misiak

et al. 2015

Journal of Applied Physics

113

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“…The measured lifetime would correspond to 2.0 H 2 O molecules in the first coordination sphere according to Horrocks' equation. 32,33 This is unreasonable considering the synthesis conditions; due to the high temperature synthesis full dehydration can be considered certain for all samples. As described above, the lifetimes are controlled by the non-radiative energy transfer from excited Eu 3+ to MoO 4 2− , and no information on the hydration state of Eu 3+ can be obtained.…”

Section: Trlfs Of Powder Sample Solid Solution Seriesmentioning

confidence: 99%

“…Under this condition, the number of water molecules coordinating Eu 3+ can be determined through Horrocks' equation. 32,33 In the presence of transition metals a different path for radiationless deexcitation becomes available, and fluorescence lifetimes are no longer a simple function of the number of water molecules in the first coordination sphere of Eu 3+ . This effect has been well documented for systems containing Fe, as well as other transition metals [34][35][36] and can be described theoretically as direct metalto-metal energy transfer.…”

Section: Introductionmentioning

confidence: 99%

Characterization of powellite-based solid solutions by site-selective time resolved laser fluorescence spectroscopy

et al. 2013

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We present a comprehensive study of the solid solution system Ca 2 (MoO 4 ) 2 -NaGd(MoO 4 ) 2 on the molecular scale, by means of site-selective time resolved laser fluorescence spectroscopy (TRLFS). Eu 3+ is used as a trace fluorescent probe, homogeneously substituting for Gd 3+ in the solid solution crystal structure. Site-selective TRLFS of a series of polycrystalline samples covering the whole composition range of the solid solution series from 10% substitution of Ca 2+ to the NaGd end-member reveals it to be homogeneous throughout the whole range. The trivalent ions are incorporated into the powellite structure in only one coordination environment, which exhibits a very strong ligand-metal interaction. Polarizationdependent measurements of a single crystal of NaGd(Eu)(MoO 4 ) 2 identify the coordination geometry to be of C 2v point symmetry. The S 4 symmetry of the Ca site within the powellite lattice can be transformed into C 2v assuming minor motion in the first coordination sphere.

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“…Corresponding measurements in D 2 O confirmed that the major species present in solution was indeed the [Eu(PYZ) 2 (H 2 O) q ] 3− complex, with a value for 'q', the total number of inner sphere water molecules, calculated to be 2.6 ± 0.5 from the well known Horrocks relationship. 27 In order to confirm the photophysical behaviour observed in aqueous solution, it was necessary to determine the protonation and aqueous stability constants for the H 2 PYZ ligand and its Eu(III) complexes using potentiometric techniques. Within the pH range studied (ca.…”

Section: Aqueous Stability and Photophysicsmentioning

confidence: 99%

A comparison of sensitized Ln(iii) emission using pyridine- and pyrazine-2,6-dicarboxylates

Moore

2012

Dalton Trans.

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The synthesis, X-ray structure, solution stability, and photophysical properties of Eu(III) complexes with pyrazine-2,6-dicarboxylic acid (H 2 PYZ) are reported, and compared to structurally analogous complexes with pyridine-2,6-dicarboxylic acid (H 2 DPA). The [Eu(PYZ) 3 ] 3− complex demonstrates highly efficient metal-centered Eu(III) luminescence in the solid state (Φ total ∼ 60.9%). In aqueous solution, moderate stability is retained at pH 7.4 ( pEu ∼ 10.5), although hydrolysis of the complex anion becomes competitive below mM concentrations, and the observed luminescence intensity from the Eu(III) metal ion is reduced as a result. A complete evaluation of the thermodynamic solution stability has allowed the observed differences in the solution behaviour luminescence properties of these complexes to be rationalized. An analysis of their luminescence behaviour in the solid state has also allowed a direct comparison of the sensitisation behaviour for these isostructural compounds.

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Lanthanide ion probes of structure in biology. Laser-induced luminescence decay constants provide a direct measure of the number of metal-coordinated water molecules

Cited by 1,354 publications

References 13 publications

Neodymium-doped nanoparticles for infrared fluorescence bioimaging: The role of the host

Neodymium-doped nanoparticles for infrared fluorescence bioimaging: The role of the host

Characterization of powellite-based solid solutions by site-selective time resolved laser fluorescence spectroscopy

A comparison of sensitized Ln(iii) emission using pyridine- and pyrazine-2,6-dicarboxylates

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