Synthesis, structure, and magnetic properties of a novel difluoro-bridged copper(II) dimer with unusually strong antiferromagnetic coupling

The crystal structure of Cu2F2(mppzH)4(BF4)2 contains dimeric co-square-planar cations [(mppzH)2Cu2F2-(mppzH)2]2+(mppzH = 3-methyl-5-phenylpyrazole), and exhibits an unusually strong antiferromagnetic interaction.