METAL-ALPHA,OMEGA-DICARBOXYLATE COMPLEXES .2. -N-3)COPPER(II)-DI-MU-ADIPATO(1-)-O-1-O-6,O-6-O-1]

The structure of the title compound, [CU(C6H9O4)(2)-(C3H4N2)(2)](n), i s polymeric, joining two Cu-II-trans(imidazole)2 units by two extended adipate monoanions. The metal ion at the centre of symmetry has a hig hly distorted octahedral coordination; the two longer bonds are formed to the protonated carboxylate O atoms [Cu1-O3 2.499 (2) Angstrom] and the octahedron is completed by bonds to two imidazole N atoms and two deprotonated carboxylate groups. The 'building block' of the polymer is an 18-membered ring of maximum dimensions 10.61 and 5.61 Angstrom. Their molecular packing in space group C2/c, however, prevents channel formation of this size. The polymeric chains of the acid form very st rong intramolecular hydrogen bonds via O3-H ... O-2 across the metal c entre.