CRYSTAL-STRUCTURE OF CESIUM 1,2,4,5-BENZENETETRACARBOXYLATE - A VERY SHORT HYDROGEN-BOND

The crystal structure of cesium 1,2,4,5-benzenetetracarboxylate has be en determined by X-ray diffraction and refined by least-squares method s to R = 0.057 and R(w) = 0.067 using 708 reflections. The compound cr ystallizes in the triclinic space group P1BAR with one anion in the un it cell. The lattice parameters are a = 6.8827(6), b = 7.9480(5), c = 5.1033(6) angstrom, alpha = 92.260(7), beta = 104.782(7), gamma = 90.9 70(5)degrees and V = 269.61 angstrom3. There is a very short hydrogen bond with an O...O distance of 2.42 angstrom. The cesium ion is ten-co ordinate with a distorted bicapped square antiprism geometry of oxygen s about the cesium.