Novel one-dimensional structures and solution behaviour of copper(ii) bromide and chloride complexes of a new pentapyridyldiamine ligandElectronic supplementary information (ESI) available: Table S1: Selected bands from FTIR spectra of solid-state species in KBr disks. Table S2: UV-Vis-NIR spectroscopic data. Fig. S1: Views of the crystal structure of [Cu2(L)Br3]2[Cu2Br4], illustrating: (a) the chains of bromide-bridged [Cu2(L)Br2]2+ tectons and interspersed [Cu2Br4]2? counter ions; (b) the packing of the

Abstract

Copper() bromide and chloride complexes of the new heptadentate ligand 2,6-bis(bis(2-pyridylmethyl)amino)-methylpyridine (L) have been prepared. For the bromide complexes, chains of novel, approximately2ϩ 'wedge-shaped' tectons are found. The links between the dicopper tectons and the overall chirality and packing of the chains are dictated by the bromide ion content, not the counter anion. In contrast, the chloride complexes exhibit linked asymmetric [Cu 2 (L)Cl 3 ] ϩ tectons with distinct N 3 CuCl 2 and N 4 CuCl 2 centres in the solid. The overall structures of the dicopper bromide and chloride units persist in solution irrespective of the halide. The redox chemistry of the various species is also described.