Two types of HF2−bridges are found in the rectangular polymeric network formed from CuII, FHF−, and pyrazine (pyz). The resulting linear Cu-(FHF)2-Cu chains are linked into 2D sheets by pyz units. The FHF− coordination in the Cu-(FHF)2-Cu chains mimics motifs found in transition metal/azide systems. In their Communication on page 1573 ff. J. L. Manson et al. also show that stronger spin exchange occurs along the HF2− bridges than the Cu-pyz-Cu bridges.