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• W2083376879 abstract "The synthesis and structures of two new isostructural mononuclear [Ln(L)(NO3)(H2O)3](NO3)2 complexes, with Ln = Tb (complex 1) and Eu (complex 2), which display high activity in the hydrolysis of the substrate 2,4-bis(dinitrophenyl)phosphate, are reported. These complexes displayed catalytic behavior similar to the mononuclear gadolinium complex [Gd(L)(NO3)(H2O)3](NO3)2 previously reported by us (Inorg. Chem. 2008, 47, 2919−2921); one hydrolysis reaction in two stages where the diesterase and monoesterase activities could be monitored separately, with the first stage dependent on and the second independent of the complex concentration. Through potentiometric studies, electrospray ionization mass spectrometry (ESI-MS) analysis, and determination of the kinetic behaviors of 1 and 2 in acetonitrile/water solution, the species present in solution could be identified and suggested a dinuclear species, with one hydroxo group, as the most prominent catalyst under mild conditions. The complexes show high activity (k1 = 7 and 18 s−1 for 1 and 2, respectively) and catalytic efficiency. Complexes 1 and 2 were found to be active toward the cleavage of plasmid DNA, and complete kinetic studies were carried out. Studies with a radical scavenger (dimethylsulfoxide) confirmed the hydrolytic action of 1 and 2 in the cleavage of DNA. Studies on the incubation of distamycin with plasmid DNA suggested that 1 and 2 are regio-specific, interacting with the minor groove of DNA. These complexes displayed luminescent properties. Complex 1 showed higher emission intensity than 2 due to a more efficient energy transfer between triplet and emission levels of terbium (T → 5D4), along with nonradiative deactivation mechanisms of the excited states of europium via multiphonon decays and the ligand-to-metal charge transfer state. Lifetime measurements of the 5D4 and 5D0 excited levels for 1 and 2, respectively, indicated the numbers of coordinated water molecules for the complexes." @default.
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• W2083376879 date "2010-06-04" @default.
• W2083376879 modified "2023-10-01" @default.
• W2083376879 title "Efficient Phosphodiester Hydrolysis by Luminescent Terbium(III) and Europium(III) Complexes" @default.
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• W2083376879 doi "https://doi.org/10.1021/ic100549u" @default.
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