Cd(H 2 O) 2 [C 6 H 3 (COO) 2 (COOH)] ‐ Ein zweidimensionales Koordinationspolymer mit Kationenaustauschermerkmalen

Cd(H 2 O) 2 [C 6 H 3 (COO) 2 (COOH)] ‐ A Two‐Dimensional Coordination Polymer with Cationexchanger Features Monoclinic single crystals of Cd(H 2 O) 2 [C 6 H 3 (COO) 2 (COOH)] have been prepared in aqueous solution at 80 °C. Space group C2/c (no. 15), a = 1973.0(2), b = 910.74(7), c = 1336.81(10) pm, β = 117.897(8)°, V = 2.1230(3) nm 3 , Z = 8. Cd 2+ is coordinated in a moderately distorted pentagonal bipyramidal fashion by five oxygen atoms stemming from the monohydrogentrimesinate anions in the equatorial plane and two water molecules in the apical positions (Cd–O 224.0(2) – 255.0(2) pm). The connection of Cd 2+ with [C 6 H 3 (COO) 2 (COOH)] 2− yields a two‐dimensional coordination polymer. The atoms of the monohydrogentrimesinate anion form in good approximation a common plane. Thermogravimetric analysis in air shows that the dehydrated compound is stable up to 390 °C. Further decomposition yields CdO.