An extremely well-isolated 2D antiferromagnet

We report on the synthesis, structure, and magnetic susceptibility of an extremely well-isolated rectangular Heisenberg, S $=$ 1/2 antiferromagnet, [Cu(pz)$_{2}$(4-OHpy)$_{2}$](PF$_{6}$)$_{2}$, where pz $=$ pyrazine and 4-OHpy $=$ 4-pyridone. The copper and pyrazine form nearly square layers of pyrazine-bridged copper(II) ions, with the pyridone molecules normal to the layers, coordinated to the copper sites by the oxygen. The distance between copper sites in adjacent layers is approximately 13 {\AA} indicating a high degree of two-dimensionality. The magnetic susceptibility is best described by a model of an antiferromagnetic rectangle with the stronger and weaker interactions of 8.3 K and 4.4 K, respectively. The compound is more symmetric than an analogous compound [Cu(pz)$_{2}$(2-OHpy)$_{2}$](ClO$_{4}$)$_{2}$, reported previously [1]. \\[4pt] [1] V. Selmani, C. P. Landee, M. M. Turnbull, J. L. Wikaira, and F. Xiao. Inorg. Chem. Comm. 13, 1399-1401 (2010), doi: 10.1016/j.inoche.2010.07.045