Magnetism and the Optical Properties of Organic Ammonium-3d Transition Metal Complexes

Abstract

Organic-inorganic complex magnets ((RNH₃)₂MX₄) were synthesized, where R is a simple alkylammonium molecule (CH₃(CH₂)₁₇), a 1-methy1-naphthalene (C₁₀H₉CH₂), a 1-pro-pyl-naphthalene (C₁₀H₉O(CH₂)₃), or a 1-buty1-naphthalene (C₁₀H₉O(CH₂)₄), M is a 3d transition metal element, and X is a halide element (Cl). Their complexes had a layered perovskite structure checked by XRD. The distance of interlayer space between MCl-based layers was shorter for the complexes with 1-buty1-naphthalene than for those with 1-propy1-naphthalene. When R was a simple alkylammonium molecule, a 1-methy1-naphthalene and a 1-propy1-naphthalene, its Cu complexes showed ferromagnetism and its Mn complexes antiferromagnetism. How-ever, Cu and Mn complexes with a 1-buty1-naphthalene did not show ferromagnetism and antiferromagnetism, respectively. The absorption spectra of Cu complexes were also measured. When R was a simple alkylammonium molecule, a 1-methy1-naphthalene, and a 1-propy1-naphthalene, Cu complexes showed a D_4th structure for inorganic layers, while the structure for the complex with a 1-buty1-naphthalene was D_2d.