Potassium gallium hydrogenphosphate fluoride,K2Ga[H(HPO4)2]F2

Hydrothermally synthesized dipotassium gallium {hydrogen bishydrogenphosphate(V)]} difluoride, K₂GaH(HPO₄)₂]F₂, is isotypic with K₂FeH(HPO₄)₂]F₂. The main features of the structure are (Ga{H(HPO₄)₂}F₂]²⁻)_n columns consisting of centrosymmetric Ga(F₂O₄) octahedra average Ga—O = 1.966 (3) Å and Ga—F = 1.9076 (6) Å] stacked above two HPO₄ tetrahedra average P—O = 1.54 (2) Å] sharing two O‐atom vertices. The charge‐balancing seven‐coordinate K⁺ cations average K—O,F = 2.76 (2) Å] lie in the intercolumn space, stabilizing a three‐dimensional structure. Strong O...O = 2.4184 (11) Å] and medium O...F = 2.6151 (10) Å] hydrogen bonds further reinforce the connections between adjacent columns.