Two 2-D copper(II) azido compounds: catena-poly[di-1,1-azido,di-N,O-(quinolinecarboxylato)(aqua)copper(II)] and 1-D catena-poly[di-N,N'-(quinoxaline)copper(II)nitrate]

We synthesized three copper(II) complexes with two structurally related polydentate ligands, quinoline-4-carboxylic acid (quCOOH) and quinoxaline (qux). The structures of these complexes were determined using X-ray single crystal crystallography. Complex 1, [Cu(quCOO)(N3)(H2O)]n, has a 2-D polymeric structure through di-1,1 azido groups forming (Cu2N2) dimeric units and di-N,O quinoline carboxylate bridging the binuclear copper units. [Cu(quCOO)(N3)(H2O)]n 0.87MeOH, (2), has the same structure as 1 in addition to MeOH molecules separating the 2-D sheets of [Cu(quCOO)(N3)(H2O)]n. [Cu(qux)(NO3)2]n, (3), has no coordinated azido groups, but the quinoxaline is a bidentate bridging ligand giving a 1-D chain, while the O,O' chelating nitrato groups stabilize the chain structure by forming a square planar coordination sphere around copper. IR and UV-Vis spectra of the complexes are in agreement with the crystal structures.