| Oxygen carrier is a kind of transition metal complexes which can absorb O2 reversibly. The study on oxygen carrier has been widely expanding because of its potential applications in the field of dioxygen separation, storage and its significant meaning on research of life sciences.The study of macrocyclic compounds in synthesis, stability and catalytic activity has become an important content in the field of bioinorganic chemistry and coordination chemistry of modern times, for the reason that the structures of these compounds are similar to those of some important bioenzymes in body, which are hopeful to acquire great breakthrough in biomimetic chemistry, environmental protection, exploitation of new materials and medicines. Aza-crown ethers can form stable complexes with both alkali and transition metal ions, therefore, they have received much attention as macrocyclic receptors for a range of metal ions. Now aza-crown ethers have filtered into many subjects such as analytical and separate chemistry, biochemistry, medical chemistry, and accelerated the development of supramolecular chemistry and host-guest chemistry.Solid-state chemistry is an important composition of material chemistry and shows its advantages in coordination chemistry greatly. In this paper, we synthesized five aza-crown macrocyclic ligands and related aza-crown cobalt complexes as oxygen carrier by solid-state reaction and discussed the oxygenation properties .The contents of this work contain six parts:1. Synthesis and application for aza-crown ether were discussed. Development of Schiff base complexes and some typical oxygen carriers were reviewed.2. Two N2O3-type macrocyclic crowned Schiff base ligands (2, 5, 8-Trioxa-16,20- diazatricyclo [20.4.0.09.14] hexacosa-9,11,13,15,20,22,24,26-octaene and 2,5,8- Trioxa-16,21-diazatricyclo[21.4.0.09.14]heptacosa-9,11,13,15,21,23,25,27-octaene) were synthesized, and the related crystal structures were determined. Two new cobalt complexes were synthesized by solid-state reaction at room temperature. It was found that one mole of the complex reacted with one mole of oxygen at room temperature. And the two oxygenated complexes obtained were characterized by elemental analysis, IR spectra, TG-DSC, UV-vis, etc.3. One N2O3-type aza-crown ether (1,15-diaza-3,4:12,13-dibenzo-5,8,11- trioxacyclooctadecane) was synthesized, and the related crystal structure was determined. The oxygenation property of its cobalt complex obtained by solid-state reaction at room temperature was studied. It was found that one mole of the complex reacted with one mole of oxygen at room temperature. And the oxygenated complex was characterized by elemental analysis, IR spectra, TG-DSC, UV-vis, etc.4. One N3O2-type aza-crown ether (1,12,15-Triaza-3,4:9,10-dibenzo-5,8- dioxacycloheptadecane) was synthesized,and the related crystal structure was determined. Its cobalt complex was obtained by solid-state reaction at room temperature. It was found that one mole of the complex reacted with one mole of oxygen at room temperature. And the oxygenated complex was characterized by elemental analysis, IR spectra, TG-DSC, UV-vis, etc.5. One N3O3-type aza-crown ether (1,12,15-Triazonia-3,4,12,13-dibenzo-1,15,18- trioxacycloeicosadiene tribromide) was synthesized,and the related crystal structure was determined. Its cobalt complex was obtained by solid-state reaction at room temperature. It was found that one mole of the complex reacted with one mole of oxygen at room temperature, and that the oxygenated complex was characterized by elemental analysis, IR spectra, TG/DSC, UV-vis, etc. UV-vis spectra showed that its cobalt complex has some reversible oxygenation property in solution. However, the oxygenated complex easily pro-degradated, and the oxygen absorbed was consumed to oxidize ligand. 6. Summary of this paper was discussed. Prospect for oxygen carrier and the development of our work were reviewed.
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