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We report the mechanical properties of a framework structure, [Cu2F(HF)(HF2)(pyz)4][(SbF6)2]n (pyz = pyrazine), in which [Cu(pyz)2]2+ layers are pillared by HF2 anions containing the exceptionally strong F–H⋯F hydrogen bonds. Nanoindentation studies on single-crystals clearly demonstrate that such bonds are extremely robust and mechanically comparable with coordination bonds in this system.

Graphical abstract: Mechanical properties of a metal–organic framework containing hydrogen-bonded bifluoride linkers

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