Design of chiral magnets: cyanide-bridged bimetallic assemblies based on cyclohexane-1,2-diamine

摘要

Four magnetic compounds based on chiral ligands trans -(1S,2S)-chxn and trans-(1R,2R)-chxn (chxn: cyclohexane-1,2-diamine), [Ni(trans-(1S,2S)-chxn)(2)](3)[Fe(CN)(6)](2).2H(2)O (1), [Ni(trans-(1R,2R)-chxn)(2)](3)[Fe(CN)(6)](2) . 2H(2)O (2), [Cu(trans-(1S,2S)-chxn)(2)](3)(-)[Fe(CN)(6)](2) . 4.5H(2)O (3) and [Cu(trans-(1R,2R)-chxn)(2)](3)[Fe(CN)(6)](2) . 4.5H(2)O (4), are reported. The four compounds are chiral, as confirmed by X-ray analyses and circular dichroism measurements. From the magnetic point of view, I and 2 behave as ferromagnets, whereas 3 and 4 show a paramagnetic behavior. (C) 2003 Elsevier Science Ltd. All rights reserved. [References: 28]