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Pfeiffer described a compound of composition coba ltous bis-salicylaldehyde ethylenediamine that turned from a reddish color to black when exposed to air.2 Tsumakei then showed that the blackening was due to adsorption of oxygen from the air.2 He also showed that the sorption was reversible and that the oxygen could be driven off by heating in carbon dioxide. These results then stimulated a tremendous amount of work by Calvin and coworkers who synthesized and characterized a large number of cobalt chelates capable of binding oxygen.5-9 Among these compounds were cobaltous bis-salicylaldehyde ethylenediamine (Co(salen) or salcomine) and cobaltous bis(3-fluoro- salicylaldehyde) ethylenediamine (Co(fluomine)). These compounds, shown in Figure 1, represent the most extensively studied of the oxygen-binding cobalt complexes.2,10 Co(salen) has reversible oxygen-binding capability; and there have been several attempts to develop a system for oxygen production from air using Co(salen). The U.S. Air Force has attempted to develop the material for onboard oxygen support systems. Co(salen), however, is quickly deactivated by the presence of moisture. Many of the drawbacks of Co(salen) were reduced by the use of the compound Co(fluomine), which is stable in moisture and was studied extensively by the U.S. Air Force in the mid-70’s for potential use in breathing air systems for crews of military aircraft.11,12 As with the Co(salen) material, the commercialization of Co(fluomine) has been hampered by the long term chemical instability of the complex. Chen and Martell synthesized and characterized a large number of O2-binding cobalt Schiff base complexes.13,14 Dzugan and Busch characterized new oxygen-binding macrocyclic cobalt complexes.15 Ramprasad et al. reported a group of solid state crystalline cyanocobaltate complexes with reversible and very high oxygen-binding 156PDF Image | PSA USING SUPERIOR ADSORBENTS
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