Syntheses, solubilities and oxygen absorption properties of new cobalt(II) Schiff-base complexes

摘要: Abstract The syntheses, solubilities and oxygen absorption properties of cobalt(II) complexes N,N′-bis(salicylidene)-2,2′-dimethyl-1, 3-propanediimine ligand derivatives, termed CoSaldmpr, are reported. These homologs the well-known N,N′-bis(salicylidene)ethylenediiminicobalt(II) (CoSalen) complexes, in which a 2,2-dimethyl-1,3-propanediimino bridging group replaces ethylenediimino CoSalen. Solubility data limited oxygen-carrying 1-methyl-2-pyrrolidinone (NMP) solution, either alone or presence 2-cyanopyridine (2 M) as an axial base, Oxygen transport solutions is tested with flow system thermal swing process O2 conditions 37°C desorption 100–180°C. two CoSaldmpr that have higher affinities than CoSalen homologs. In NMP solution 2 M loading Co(3-methoxy-Saldmpr), measured (g O2/g solution) remains about 35% Co(3-methoxy-Salen) for at least four absorption/desorption cycles.