Molecular building blocks for magnetic spin chains

• Published in: Journal of physics. Condensed matter Vol. 18; no. 48; pp. 10837 - 10841
• Main Authors: Hu, Jingshi, Sun, Jibin, Hopkins, Michael D, Rosenbaum, T F
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 06.12.2006; Institute of Physics
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Diamagnetism, paramagnetism and superparamagnetism; Exact sciences and technology; General theory and models of magnetic ordering; Magnetic properties and materials; Nonmetals; Physics; Spin chain models; Molecular magnetism; Magnetization; Superexchange interactions; Paramagnetic materials; Heisenberg model; Metal complex; Benzenic compound; Spin chain; Exchange interactions; Organic compounds; Magnetic susceptibility
• ISSN: 0953-8984; 1361-648X
• DOI: 10.1088/0953-8984/18/48/010

The paramagnetic di(metalloethynyl)benzene ion [1,4-C6H4{CW(depe)2Cl}2]2+ was synthesized from diamagnetic l,4-C6H4{CW(depe)2Cl}2 (depe = l,2-bis(diethylphosphino)ethane). Systematic measurements of magnetic susceptibility for both crystalline and powder-formed compounds indicate a predominant super-exchange coupling between the magnetic tungsten centres. We provide a quantitative description of the observed susceptibility using a decoupled Heisenberg dimer model, and find that all the complexes exhibit a robust antiferromagnetic coupling between spins, J approx 38 K. We note their potential use as building blocks for one-dimensional spin chains-with or without disorder-and describe possible synthetic routes to these architectures.