(Croconato-kappa2O,O')bis(1,10-phenanthroline-kappa2N,N')cobalt(II), and the nickel(II) and copper(II) analogues.

The title complexes, [M(C5O5)(C12H8N2)2], with M = Co(II), Ni(II) and Cu(II), all lie across twofold rotation axes, around which two 1,10-phenanthroline ligands are arranged in a chiral propeller manner. The Co(II) and Ni(II) complexes are isostructural, with octahedral coordination geometry, while the local geometry of the Cu(II) complex is severely distorted from octahedral.