Abstract
AbstractTerbium(III) ions were coordinated to two diethylenetriaminepentaacetic acid (DTPA) amphiphilic bisamide ligands, and the complexes were assembled into micellar nanoaggregates. The magnetic and optical properties of the resulting nanoaggregates were examined in detail. Upon excitation into the ligand levels at 265 nm, the complexes show characteristic TbIII emission at 546 nm with quantum yields of up to 7.6 %. Nuclear magnetic relaxation dispersion (NMRD) measurements have shown that the transverse relaxivity r2 at 500 MHz and 310 K reaches a maximum value of 9.4 s–1 mM–1. The efficient T2 relaxivity at high magnetic field strengths is sustained by the increased rotational correlation time of the nanoaggregates and high magnetic moment of the terbium ion.
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