Copper(I) tribromide dianion as a weakly-bridging, axial ligand: Synthesis of an unusual mixed-valent Cu(II)2Cu(I) trimer

Copper complexes of a new resorcinol-substituted trimethylethylenediamine ligand have been isolated and characterised. The results reveal limitations to the use chiral ligands with hydrogen bond donor groups located for intermolecular hydrogen bonding for the self-assembly of helical coordination polymers and include the X-ray crystal structure of an unusual mixed-valent Cu(II)2Cu(I) trimer in which image anion acts as a bridging ligand between the two Cu(II) centres.