Co(III) complexes with optically active bis(menthane), pinano-para-menthane, carano-para-menthane, and bis(carane) propylenediaminodioximes

Novel optical ligands bis(menthane) (H2L1), pinano-para-menthane (H2L2), and carano-para-menthane (H2L3) propylenediaminodioximes are obtained. Diamagentic Co(III) complexes of the composition Co(HL1)Cl-2 (I), Co(HL2)Cl-2 (II), Co(HL3)Cl-2 (III), and Co(HL4)Cl-2 center dot H2O (IV) are synthesized by reactions of CoCl2 with H2L1, H2L2, H2L3 and bis(carane) propylenediaminodioxime (H2L4) in ethanol in air. The crystal and molecular structures of compound I is determined by X-ray diffraction analysis. The crystals are monoclinic with the unit cell parameters a 7.8385(3) angstrom, b = 11.4074(6) angstrom, c = 14.9509(6) angstrom, beta = 104.278(2)degrees, V = 1295.57(10) angstrom(3), Z=2, rho(calcd) = 1.367 g/cm(3), F(000) = 564, M = 533.41, space group P2(1). The crystal structure of complex I consists of individual mononuclear molecules. The Co3+ ion coordinates four N atoms of tetradentate cycle-forming anionic ligand and two Cl atoms. The coordination polyhedron of Cl2N4 is a distorted octahedron. The C-13 and H-1 NMR spectra of the complexes synthesized confirm coordination of four N atoms of a ligand.