TY - JOUR
T1 - Potassium hydrogen diphthalate dihydrate
T2 - A new structure and correction to the literature
AU - Benedict, Jason B.
AU - Bullard, Theresa
AU - Kaminsky, Werner
AU - Kahr, Bart
PY - 2004/11
Y1 - 2004/11
N2 - The title compound, K+·[(C8H5O 4H]-·2H2O or K+·- C16H11O8- ·2H2O, was prepared by slow evaporation of an aqueous solution of potassium hydrogen phthalate. The molecular complex consists of a potassium cation coordinated to a proton-bound hydrogen phthalate dimer and two water molecules. The potassium cation resides on a twofold axis in a distorted square-antiprism coordination geometry. The compound is isomorphous with the ammonium analogue, previously misidentified. As potassium hydrogen phthalate is frequently used in the manufacture of buffers, organic carbon standards, acidimetric standards and various other products, the crystallization of a compound with a different stoichiometery from a solution containing the acidimetric standard has important practical implications.
AB - The title compound, K+·[(C8H5O 4H]-·2H2O or K+·- C16H11O8- ·2H2O, was prepared by slow evaporation of an aqueous solution of potassium hydrogen phthalate. The molecular complex consists of a potassium cation coordinated to a proton-bound hydrogen phthalate dimer and two water molecules. The potassium cation resides on a twofold axis in a distorted square-antiprism coordination geometry. The compound is isomorphous with the ammonium analogue, previously misidentified. As potassium hydrogen phthalate is frequently used in the manufacture of buffers, organic carbon standards, acidimetric standards and various other products, the crystallization of a compound with a different stoichiometery from a solution containing the acidimetric standard has important practical implications.
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U2 - 10.1107/S0108270104019043
DO - 10.1107/S0108270104019043
M3 - Article
C2 - 15528800
AN - SCOPUS:9744261059
SN - 0108-2701
VL - 60
SP - m551-m553
JO - Acta Crystallographica Section C: Crystal Structure Communications
JF - Acta Crystallographica Section C: Crystal Structure Communications
IS - 11
ER -