Bromide hydrogen oxalate salts with the diprotonated 1,4-diazabicyclo[2.2.2]octane counterion

International audienceAbstract Two new salts composed of the diprotonated 1,4-diazabicyclo[2.2.2]octane (DABCO) molecule as the cations and bromide and hydrogen oxalate as the anions have been isolated and structurally characterized by X-ray diffraction analysis. The salt [DABCOH 2 ]{[HC 2 O 4 ][Br]} ( 1 ) crystallizes in the orthorhombic system, space group P 2 1 2 1 2 1 with a = 9.0809(7), b = 9.5156(7), c = 12.3558(9) Å, V = 1067.67(14) Å 3 and Z = 4. The salt [DABCOH 2 ] 2 {[HC 2 O 4 ][Br] 3 }·H 2 O ( 2 ) crystallizes in the orthorhombic system, space group Pnma with a = 26.6554(17), b = 7.3711(4), c = 10.7421(7) Å, V = 2110.6(2) Å 3 and Z = 4. The compounds were prepared from ethanolic solutions of [DABCOH 2 ][HC 2 O 4 ] 2 ( L 1 ) and ZnBr 2 in molar ratios of 2:1 and 1:1, respectively. The salts 1 and 2 exhibit extended hydrogen bonding networks leading to supramolecular topologies