Weak ferromagnetism in 1D coordination polymers: Syntheses, crystal structures, spectroscopic and magnetic properties of [Cu(L)(Memal)]n (Memal2−=the dianion of methylmalonic acid, L=1,10-phenanthroline, 2,2′-bipyridine)
摘要:
Investigation of the CUCl2/H(2)Memal/L (H(2)Memal = methylinalonic acid, L = 1, 10-phenanthroline or 2,2'-bipyridine) reaction system in MeOH and various molar ratios has lead to the isolation of two one-dimensional coordination polymers presenting the [Cu(L)-(Memal)] repeating unit (1, L = 1,10-phen; 2, L = 2,2'-bpy). The Memal(2-) ligand adopts the bidentate [chelating] + unidentate coordination mode between the Cull ions. Magnetic susceptibility measurements on 1 and 2 indicated the existence of weak ferromagnetic intrachain interactions and X-band EPR spectra from powdered samples of I and 2 are consistent with the stereochemistry of the Cull ions and with the presence of weak exchange interactions. (c) 2007 Elsevier Ltd. All rights reserved.