Ferromagnetic Hetero–Metal Assemblies, {NBu4[CuCr(ox)3]}x and {[{Cu(bpy)}2Cr(ox)3]NO3}x

Abstract

Abstract Two types of hetero–metal assemblies {NBu4CuCr(ox)3]}x (1) and {[{Cu(bpy)}2Cr(ox)3]NO3}x (2)(NBu4 = tetrabutylammonium ion, ox = oxalate ion, bpy = 2,2′-bipyridine, x = infinite number) have been synthesized and their cryomagnetic properties (4.2–300 K) have been examined. The compound 1 has an oxalate-bridged three-dimensional lattice and show a ferromagnet-like property (Curie point 7 K): the moment (per CrCu) increases from 4.37 μB at 300 K to 14.80 μB at 9 K and diverges below 9 K. The compound 2 also shows a ferromagnetic interaction and its moment (per CrCu2) increases from 4.82 μB at 300 K to 8.78 μB at 5 K.