STRUCTURE OF A CITRATE DOUBLE SALT - POTASSIUM DIHYDROGEN CITRATE LITHIUM POTASSIUM HYDROGEN CITRATE MONOHYDRATE

The crystal structure of a double salt of potassium dihydrogen citrate and lithium potassium hydrogen citrate monohydrate has been determine d. One potassium ion is coordinated with eight O atoms and the other w ith nine O atoms at M-O distances in the range 2.660 (1) to 3.139 (1) angstrom. Two of these O atoms are shared by both potassium ions. The lithium ion is tetrahedrally surrounded by four O atoms at distances i n the range 1.870 (3) to 1.988 (3) angstrom. This crystal structure co ntains nine hydrogen bonds in the asymmetric unit. The water molecule connects different citrate ions along the c direction by hydrogen bond ing.