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In the title mol­ecular salt, C22H22O2P+·PF6, the side chain of the cation adopts an anti–gauche conformation [P—C—C—C and C—C—C—C torsion angles = −179.11 (10) and −77.18 (16)°, respectively]. In the crystal, the cations are linked into carb­oxy­lic acid inversion dimers by pairs of O—H...O hydrogen bonds. Weak C—H...F and C—H...(F,F) hydrogen bonds connect the components into a three-dimensional network, but there are no aromatic π–π stacking inter­actions.
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