Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Solubilities of Salen Derivatives and Their Cobalt Complex in Liquid and Supercritical CO2

  • Koh, Seung-Hyun (Green Nuclear Research Lab., EIRC, Kyung Hee University) ;
  • Jeon, Byung-Wan (Green Nuclear Research Lab., EIRC, Kyung Hee University) ;
  • Kim, Ha-Kwon (Green Nuclear Research Lab., EIRC, Kyung Hee University) ;
  • Park, Kwang-Heon (Green Nuclear Research Lab., EIRC, Kyung Hee University) ;
  • Kim, Hong-Doo (Green Nuclear Research Lab., EIRC, Kyung Hee University)
  • Published : 2004.04.20
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Abstract

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 $CO_2$. 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.

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