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Published December 6, 2006 | Published
Journal Article Open

Molecular building blocks for magnetic spin chains

Abstract

The paramagnetic di(metalloethynyl)benzene ion [1,4-C_6H_4{CW(depe)_2Cl}_2]^(2+) was synthesized from diamagnetic 1,4-C_6H_4{CW(depe)_2Cl}_2 (depe = 1,2-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~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.

Additional Information

© 2006 IOP Publishing. Received 3 August 2006, in final form 6 October 2006. Published 17 November 2006. We are grateful to S Ghosh for her valuable help in the initial stages of this investigation, and Dr Ian Steele for assistance with sample characterization. TFR acknowledges support from the US Department of Energy Grant No DE-FG02-99ER45789. JH acknowledges support from the Consortium for Nanoscience Research. MDH acknowledges support through the NSF MRSEC programme under Grant DMR-0213745.

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August 19, 2023
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