Analytical Sciences

Abstract − Analytical Sciences, 23(5), 605 (2007).

Ion-interaction Chromatography of Several Metallocyanide Complexes Stabilized by Adding Cyanide in a Neutral Mobile Phase
Yasuyuki MIURA,* Norihito TAKENAMI,* and Paul R. HADDAD**
*Department of Chemistry, School of Science, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan
**Australian Centre for Research on Separation Science, School of Chemistry, University of Tasmania, Private Bag 75, Hobart 7001, Australia
Standard solutions (at 10-5 M levels) of Cu(I)- and Fe(II)-cyanide complexes were stabilized for at least 5 h using 0.5 mM cyanide solution (around pH 9) as a medium. Complexes of Cu(I)- and Fe(III)-cyanide also could be stabilized without any dissociation by adding 1 mM cyanide to an acetonitrile-water (18:82, v/v) mobile phase (pH 7.0) containing 10 mM tetra-n-propylammonium salt (TPA). Under the optimal conditions, the six complexes of Cu(I)-, Ag(I)-, Ni(II)-, Fe(II)-, Fe(III)- and Au(I)-cyanides were resolved from their mixtures within about 45 min, with well-shaped chromatographic peaks.