A Simple Isomeric Separation of <i>D</i>₅<i>_h</i> and <i>I</i><i>_h</i> Sc₃N@C₈₀ by Selective Chemical Oxidation

Abstract

Two electrochemical oxidation waves assigned to the D(5h) isomer of Sc(3)N@C(80) have been identified, and a 270-mV difference in the first electrochemical oxidation potentials of the I(h) and D(5h) isomers has been measured. On the basis of this oxidative potential difference, a strategy for isomeric purification involving a selective chemical oxidation of the D(5h) isomer is reported. Variable scan cyclic voltammetry of the resultingly pure Sc(3)N@C(80) I(h) isomer shows evidence of a rapid endohedral chemical reaction following the first reduction process.