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The structural and magnetic properties of the series of (4,4′-bipyridinium)Cu 2 Cl 6−x Br x salts are investigated. All of the compounds are isomorphous, triclinic, space group P1¯. Structurally, the compounds contain pseudo-planar Cu2X62- dimeric species that form stacks due to weak coordination of adjacent dimer anions via semi-coordinate Cu⋯X bonds. Hydrogen bonding from...
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