The synthesis of binucleating polyaza macrocyclic and macrobicyclic ligands and the dioxygen affinities of their cobalt complexes

Article abstract of DOI:10.1016/0040-4020(94)00965-W

The synthesis of a new macrobicyclic (cryptand) ligand 1,4,9,12,19,20,25,30-octaazabicyclo(10.10.10)dotriacontane, C4BISTREN and improved syntheses of the ligands 7,9,30,trioxa-1,4,10,13,16,22,-27,33-octaazabicyclo(11.11.11)pentatria contane, OBISTREN and 1,13-dioxa-4,7,10,16,19,22-hexaazacyclotetracosane, OBISDIEN. The Co(II) complexes of these ligands are oxygen carriers. Among the six macrocyclic and six macrobicyclic ligands that are considered in this paper, the binuclear cobalt(II) complexes of OBISTREN and OBISDIEN form the most stable dioxygen complexes.