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Antiferromagnetism in a Family of <i>S</i> = 1 Square Lattice Coordination Polymers NiX<sub>2</sub>(pyz)<sub>2</sub> (X = Cl, Br, I, NCS; pyz = Pyrazine)
The crystal structures of NiX2(pyz)2 (X = Cl (1), Br (2), I (3), and NCS (4)) were determined by synchrotron X-ray powder diffraction. All four compounds consist of two-dimensional (2D) square arrays self-assembled from octahedral NiN4X2 units that are bridged by pyz ligands. The 2D layered motifs displayed by 1–4 …