Magnetic Properties of Cu2(OH)3(alkanecarboxylate) Compounds: Drastic Modification with Extension of the Alkyl Chain

Abstract

Magnetic properties of the layered materials Cu2(OH)3(n-CmH2m+1COO) (m = 0, 1, 7, 8, and 9) have been examined. X-ray powder diffraction patterns indicate that the interlayer distance increases in the order of m. The interlayer distances of the m = 0 and 1 materials are shorter than the molecular heights of the intercalated carboxylates, respectively, while the distances of the m = 7−9 materials are nearly double those of the molecular heights of the corresponding carboxylates, indicating a bilayer structure in them. The temperature dependence of the paramagnetic susceptibilities of the m = 0 and 1 materials suggests an intralayer ferromagnetic interaction and an interlayer antiferromagnetic interaction. The metamagnetic behavior is supported by S-shape dependence of their magnetization curves. The temperature dependence of the paramagnetic susceptibilities of the m = 7−9 materials indicates an intralayer antiferromagnetic interaction, in opposition to those in the former two. Further, they show a diverge...