A nitronyl nitroxide and its two 1D chain Cu-Tb complexes: synthesis, structures, and magnetic properties.

A new nitronyl nitroxide, namely NIT-Ph- p -OCH 2 trz (1), and two types of one-chain Cu-Tb complexes, namely [TbCu(hfac) 5 NIT-Ph- p -OCH 2 trz·0.5C 6 H 14 ] n (2a) and [LnCu(hfac) 5 NIT-Ph- p -OCH 2 trz] n (2b) (NIT-Ph- p -OCH 2 trz = 2-(4-((1 H -1,2,4-triazol-1-yl)methoxy)phenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide; hfac = hexafluoroacetylacetonate), have been successfully synthesized simultaneously through reacting nitronyl nitroxide radical NIT-Ph- p -OCH 2 trz with Cu(hfac) 2 and Ln(hfac) 3 , and the molecular structures have been elucidated via single-crystal X-ray structural analysis. 2a features a 'ladder-like' chain structure, while 2b displays a linear chain structure built up by Ln(hfac) 3 units bridged with the NO groups of radical ligands. The additional Cu(ii) ions are coordinated to the nitrogen atoms of the triazole units. Nonzero out-of-phase signals are observed for the Tb derivatives (2a and 2b) and they exhibit frequency-dependent out-of-phase signals indicating a single-chain magnet behavior.