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Calculations have been carried out for C4H4X2 cyclic molecules, with X=O, S, Se, and Te, characterized by the presence of magnetic-field induced toroidal electron currents and associated orbital anapole moments. The orbital anapole induced by a static nonuniform magnetic field B , with uniform curl C=∇×B , is rationalized via a second-rank anapole magnetizability tensor a αβ, defined as minus the second derivative of the second-order interaction energy with respect to the components C α and B β. The average anapole magnetizability a equals −χ , the pseudoscalar obtained by spatial averaging of the dipole-quadrupole magnetizability χα,βγ. It has different sign for D and L enantiomeric systems and can therefore be used for chiral discrimination. Therefore, in an isotropic chiral medium, a homogeneous magnetic field induces an electronic anapole Aα , having the same magnitude, but opposite sign, for two enantiomorphs

Theoretical estimates of the anapole magnetizabilities of C4H4X2 cyclic molecules for X=O, S, Se, and Te