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The K atom in the title complex, [K(C 10 H 6 NO 2 )(C 10 H 7 NO 2 ) 3 ], lies on a twofold rotation axis that relates one  N , O -chelating quinoline-2-carb­oxy­lic acid to the other; their N and O atoms are  cis  to each other in the distorted octa­hedral coordination geometry. The K atom is also coordinated by another monodentate quinoline-2-carb­oxy­lic acid; the acid is disordered with respect to a monodentate quinoline-2-carboxyl­ate anion; the acid and anion are linked by an O—H⋯O hydrogen bond. An O—H⋯N hydrogen bond links adjacent mol­ecules into a linear chain structure along the  a  axis.

(Quinoline-2-carboxylato-κO)(quinoline-2-carboxylic acid-κO)bis(quinoline-2-carboxylic acid-κ2N,O)potassium

(Quinoline-2-carboxylato-κO)(quinoline-2-carboxylic acid-κO)bis(quinoline-2-carboxylic acid-κ²N,O)potassium