Magnetic relaxation and luminescent behavior in nitronyl nitroxide-based annuluses of rare-earth ions
Employing the reaction of chiral nitronyl nitroxide radical and rare-earth ions,two 2p-4fhetero-spin meso complexes[Ln(hfac)3((R)-MePP-Ph-NIT)]2,where Ln=Eu(1)and Dy(2),hfac=hexafluoroacetylacetone;(R)-MePP-Ph-NIT=2-(4-((R)-tert-butyl-2-methylpiperazine-1-carboxylate)phenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide.have been assembled.In both complexes,two chiral radicals ligate to two Ln(Ⅲ)ions to produce a cyclic dinu-clear structure.Complex 1 shows the characteristic fluorescence emission of the Eu(Ⅲ)ion.In complex 2,the frequency-dependent out-of-phase susceptibility signals connected with magnetic relaxation confirm single-molecule magnet(SMM)behavior.CCDC:2304262,1;2304263,2.
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