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- W2105683687 abstract "The treatment of [Ln(hfac)3(H2O)2] (Ln(III) = Y, Nd–Lu) with IM-2py (2-(2-pyridyl)-4,4,5,5-tetramethyl-1H-imidazolyl-1-oxyl) readily gave a series of novel rare earth or lanthanide radical complexes [Ln(hfac)3(IM-2py)]. The molecular structures of the Sm, Gd, Dy, Er and Yb complexes have been determined to be bicapped trigonal prismatic (TPRS) by X-ray diffraction. The magnetic susceptibility data for [Gd(hfac)3(IM-2py)] show that the Gd–IM-2py interaction is weakly antiferromagnetic with an exchange coupling constant J = −3.00 cm−1 in contrast to the ferromagnetic interaction in the Gd(III)–nitronyl nitroxide complexes. The n–π* transition of IM-2py is found to shift to lower frequency associated with intensity enhancement and vibronic structure. The luminescence measurement of the Eu(III) and Tb(III) complexes demonstrated energy transfers for IM-2py (SOMO π*) → Ln(III) (4f) as a result of emission quenching; this depends on the energy gap between the excited levels in Ln(III) and IM-2py. These results reveal that the metal–radical interactions are very weak magnetically but are relatively strong with respect to energy transfer." @default.
- W2105683687 created "2016-06-24" @default.
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- W2105683687 date "2002-03-18" @default.
- W2105683687 modified "2023-10-13" @default.
- W2105683687 title "Synthesis, spectroscopic and magnetic properties of lanthanide(iii) complexes with a chelated imino nitroxide radical" @default.
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- W2105683687 doi "https://doi.org/10.1039/b106401k" @default.
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