Lanthanide ions probes

Horrocks, W. de W. Jr. Sudnick, D. R. Lanthanide ion probes of structure in biology. Laser-induced luminescence decay constants provide a direct measure of the number of metal-coordinated water molecules. J. Am. Chem. Soc. 1979,101(2), 334-340. 

Li, C. W., and Korshin, G. V. (2002). Studies of metal-binding sites in natural organic matter and their role in the generation of disinfection by-products using lanthanide ion probes. 

Dobbs, J.C., Susetyo, W., Knight, F.E., Castles, M.A., Carreira, L.A. and Azarraga, L.V (1989a) Characterization of metal binding sites in fulvic acids by lanthanide ion probe spectroscopy. Anal. Chem., 61, 483M-88. 

Dobbs J. C., Susetyo W., Carreira L. A., and Azarraga L. V. (1989) Competitive binding of protons and metal ions in humic substances by lanthanide ion probe spectroscopy. Anal. Chem. 61, 1519-1524. 

A powerful, but less frequently used, method for studying the complexation of trace metal cations by DOM is lanthanide ion probe spectroscopy (Dobbs et al., 1989). In this method, fluorescence intensities of Eu(lll) at two emission wavelengths are used to determine the proportions of complexed and free Eu(lll). When a competing metal cation is added to the solution, its complexation by DOM causes the fluorescence... 

Titration curves of HS fluorescence quenching versus concentration of added metal quencher have been used to obtain the CC values of HS ligands and the stability constants of HS-metal complexes (Saar and Weber, 1980, 1982 Underdown et al., 1981 Ryan et al., 1983 Weber, 1983 Dobbs et al., 1989 Grimm et al., 1991 Hernandez et al., 2006 Plaza et al., 2005, 2006). Two fluorescence techniques, lanthanide ion probe spectroscopy (LIPS) and fluorescence quenching of HSs by Cu-+, have been used in conjunction with a continuous distribution model to study metal-HS complexation (Susetyo et al., 1991). In the LIPS technique, the HS samples are titrated by Eu-+ ions, and the titration plot of the ratio of the intensities of two emission lines of Eu + is used to estimate the amount of bound and free species of the probe ion. In the other technique, titration curves of fluorescence intensity quenched by Cu versus the logarithm of total added Cu2+ are used. 

Lanthanide ion probes The trivalent ions of the rare earth metals (lanthanides) can be monitored in biological systems, due to their magnetic and spectroscopic properties. For example, external Eu(III) and Pr(III) shift the H-NMR resonance of the -N(CH3)j head groups of lecithins in the external layer of... 

Lanthanide ions as n.m.r. chemical shift probes in biological systems. J. A. Glasel, Prog. Inorg. Chem., 1973,18, 383-413 (44). 

Lanthanide ions as structural probes in biological and model systems. E. Nieboer, Struct. Bonding... 

Nieboer E (1975) The Lanthanide Ions as Structural Probes in Biological and Model Systems. 

Local Structure of the Eu2+ Impurity. From the experimental perspective, the doping of lanthanide ions into solid state materials can be probed by different instrumental technics such as nuclear magnetic resonance (NMR),44 extended X-ray absorption fine structure (EXAFS),45,46 or electron paramagnetic resonance (EPR),47 which instead of giving a direct clue of the local geometry offers only data that can be corroborated to it. From the theoretical point of view,... 

Lanthanide ions have been used as DEFRET acceptors in split probes for DNA sequence such as shown in Figure 15.137 When using europium and terbium complexes, the choice of chromo-phores is rather restricted, owing to the high-energy emissive states associated with these ions (vide supra). In this case, the donor chromophore is a salicylic acid unit appended to an... 

Neilands, J. B. Naturally Occurring Non-porphyrin Iron Compounds. Vol. 1, pp. 59—108. Neilands, J. B. Evolution of Biological Iron Binding Centers. Vol. 11, pp. 145—170. Nieboer, E. The Lanthanide Ions as Structural Probes in Biological and Model Systems. Vol. 22, pp. 1-47. 

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