Radical-dependent magnetic interactions in two 1-D copper(II) complexes with nitronyl nitroxide and imino nitroxide radicals bridged by iminodiacetate anion

摘要

Two novel one-dimensional (1-D) chain complexes [Cu(NIT3Py)(ida)]_n (1) and [Cu(IM4Py)(ida)]_n (2) (NIT3Py = 2-(3'-pyridinyl)-4,4,5,5-tetramethylimidazoline-l-oxyl-3-oxide,IM4Py = 2-(4'-pyridinyl)-4,4,5,5-tetramethylimidazoline-l-oxyl and ida = iminodiacetate anion),were synthesized and characterized structurally and magnetically.The two complexes crystallize in neutral 1-D chains,where Cu(II)-nitroxide cationic units are linked by iminodiacetate anion ligands.The magnetic measurements show that complex 1 exhibits ferromagnetic coupling,while complex 2 exhibits antiferromagnetic interactions between the Cu(II) ion and the nitroxide radical.