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The solubility of N,N'-Bis(salicylidene) ethylenediamine ( n-salen) and N,N'-bis(3,5-di-tert-butylsalicylidene) ethylenediamine (t-butyl-salen) was studied with in-situ UV-VIS spectrometer. n-Salen is 3-5 times more soluble than t-butyl-salen in liquid or supercritical CO 2. This behavior may be attributed to Lewis acid-base interaction between salen and CO2. The chelation of salen with Co ++ ion in supercritical condition was confirmed to be fast enough above room temperature. However, the metal ion extraction capability of t-butyl salen is relatively poor because of its low solubility and ionic nature of complex.

Solubilities of Salen Derivatives and Their Cobalt Complex in Liquid and Supercritical CO2

Solubilities of Salen Derivatives and Their Cobalt Complex in Liquid and Supercritical CO₂