A macrobicyclic cage incorporating selenium donor atoms: synthesis and structure of [CoIIIL]Cl3(L = 1-nitro-8-methyl-6,10,19-triselena-3,13,16-triazabicyclo[6.6.6]icosane)

One of a new series of complexes of mixed selenium–nitrogen donor atom cage ligands is presented; X-ray structural analysis of the cobalt complex, [CoIIIL]Cl3·5H2O 1 is described together with redox, NMR and electronic spectroscopic data.