Crystal structures of the pseudo‐one‐dimensional magnetic systems, pyridinium manganese (II) chloride monohydrate and quinolinium manganese (II) chloride monohydrate, and the magnetic behavior of the quinolinium salt

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Abstract
The crystal structures of pyridinium manganese(II) chloride monohydrate (PMC) and quinolinium manganese(II) chloride monohydrate (QMC) both contain bi‐bridged linear chains. These chains are hydrogen bonded together to form a two‐dimensional network. The magnetic susceptibility of QMC is characteristic of a weak antiferromagnet with a maximum in the susceptibility at 2.0 °K. Analysis of the data in terms of a 1‐d Heisenberg linear chain gives an intrachain exchange constant of J/k=−0.36 °K. However, the best model includes significant interchain interactions. Thus, both the structural features and magnetic susceptibility indicate that QMC is a perturbed one‐diminsional system. This conclusion is supported by previously reported magnetic susceptibility and ESR data for PMC.