Recently, many HPLC stationary phases mainly based on π-π electron interaction (π-π interaction) have been developed for the separation of π-electron-rich compounds. Those include silica gels binding Cu 2+ -phthalocyanine 1-3 and In 3+ -porphine 4,5 and pyrene 6,7 derivatives. However, the preparation of such silica gels requires troublesome procedures 2,4,6 and the base silica gels for HPLC are relatively expensive. On the other hand, we have found that anionic metal-porphines are easily fastened on an ordinary anion-exchange resin through electrostatic and hydrophobic interactions.
8-13These facts led us to develop a stationary phase by modifying an anion-exchange resin with anionic Cu 2+ -phthalocyanine derivative (Cu-PCS r ), which would be prepared easily and cheaply. In the present paper, we would like to report briefly the utility of the resultant resin (hereinafter referred to as Cu-PCS r ) as a stationary phase for the separation of π-electron-rich compounds.
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