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A Simple Electrostatic Model for the Chromatographic Behavior of the Primary Dithizonates

Abstract A simple electrostatic model of the reactive sites of primary metal dithizonates which fits their published chromatographic behavior is described. Coordination with a metal ion tends to increase the formal charge on the hindered imino hydrogens in the molecule. This increase is a function of the individual metal's Sanderson electronegativity. Plots of R m vs. electronegativity are rectilinear, have the same form for all systems and adsorbents described, and place dithizonates of similar molecular geometry on separate curves. The results of this study suggest that the dithizonates are a heterogeneous group of compounds which differ in coordination configuration and geometry.