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H5EPTPACH2OH: Synthesis, Relaxometric Characterization and 1H NMR Spectroscopic...
Torres, Susana; Martins, José A.; André, João P.; Pereira, Giovannia A.; Kiraly, Robert; Brücher, Ernö; Helm, Lothar; Tóth, ÉvaThe synthesis and characterization of a new metal chelator, 4-(S)-hydroxymethyl-3,6,10-tri(carboxymethyl)-3,6,10-triazadodecanedioic acid (H5EPTPACH2OH), is reported. Protonation constants for the ligand H5EPTPACH2OH and for the previously reported H5EPTPAC16 have been determined by potentiometry, which reveals that both ligands display slightly higher protonation constants relative to that of the ligand DTPA5-...
NMR Transversal Relaxivity of Suspensions of Lanthanide Oxide Nanoparticles
Norek, Małgorzata; Pereira, Giovannia A.; Geraldes, Carlos F. G. C.; Denkova, Antonia; Zhou, Wuzong; Peters, Joop A.Aqueous suspensions of paramagnetic lanthanide oxide nanoparticles have been studied by NMR relaxometry. The observed relaxivities are explained by the static dephasing regime (SDR) theory. The corresponding R2 relaxivities are considerably smaller and are strongly dependent on the interval between the two refocusing pulses. The experimental data are rationalized by assuming the value of the diffusion correlat...
Síntese, caracterização e propriedades espectroscópicas de criptatos de lantaní...
Nova,Suzana P. Vila; Pereira,Giovannia A. de L.; Sá,Gilberto F. de; Alves Júnior,Severino; Bazin,Hervé; Autiero,Hervé; Mathis,GérardThis work reports on the synthesis, characterization (infrared and hidrogen nmr spectra) and photophysical properties (luminescence spectra and emission quantum yield) of the lanthanide cryptates [Ln<FONT FACE=Symbol>Ì</FONT>(bipy)2py(CO2Et) 2]3+ with Ln = Eu3+, Tb3+ or Gd3+, which can be applied as efficient Light-Conversion-Molecular-Devices. From emission spectra of [Eu<FONT FACE=Symbol>Ì</FONT>(bipy)2py(CO2...
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