Syntheses, structures, and magnetic properties of the lanthanide complexes of imidazole-substituted nitronyl nitroxide biradicals

Abstract

Two new bis-bidentate imidazole-substituted nitronyl nitroxide biradicals, BNITIm-C2 (BNITIm-C2 = 1,1'-(1,2-ethanediyl)bis(1H-imidazole-2-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazol-1-oxy-3-oxide)) and BNITIm-C4 (BNITIm-C4 = 1,1'-(1,4-butanediyl)bis(1H-imidazole-2-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazol-1-oxy-3-oxide)), and two series of lanthanide complexes, namely [(BNITIm-C2)Ln(NO3)3](MeOH) (Ln = Gd (1Gd) and Tb...

Lanthanide–radical single-molecule magnets: current status and future challenges

“…Notably, up to now, most of the nitronyl nitroxide-lanthanide SMMs rely mainly on mono-radicals and the research of biradicalbridged Ln SMMs remains in its infancy on account of the synthetic challenge. [64][65][66][67][68][69][70][71][72][73][74] Nitronyl nitroxide biradicals have two prominent advantages: (i) they possess four NO groups and can construct diverse topologies by means of linking to several metal ions; (ii) intramolecular magnetic coupling between two mono-radicals is able to be regulated via an appropriate conjugated spacer. The first nitronyl nitroxide biradical-4f compound was reported in 2010.…”