HOST-GUEST REACTION AND ULTRAFILTRATION P ROPERTIES OF CYCLODEXTRINS AND ISOMERS OF NITROPHENOL SYSTEMS

To study the ultrafiltration (UF) properties of host-guest binding sol utions, we carried out UF experiments using cycloxtrins (CDs) as host molecules and nitrophenols (NPs), structural isomers, as guest molecul es. The following conclusions were obtained. 1. The UF rejection of gu est molecule rises by addition of host molecule CD. This is induced by host-guest binding. 2. The rise ratio of guest molecular rejection (e ta) is reduced with operation pressure DELTAp when DELTAp is over 1 MP a. But eta is constant when DELTAp is below 1 MPa. This is independent of kind of membranes and of pressure. 3. The order of eta of NPs is o -NP<m-NP-<p-NP. This relation is same as that of the strength of host- guest binding. 4. eta becomes large with pH. This is induced by the hy drogen bond of secondary hydroxide group of CD to nitrophenolate ion t hat nitrophenol is charged into alkaline solution.