Synthesis and Properties of the Cu(II) Complexes with Chiral Bis{(E)-[(1S,4R)-Δ7,8-1-Amino-2-para-Menthalidene]aminohydroxy}methane (L - a Derivative of Natural Terpenoid (R)-(+)-Limonene). Crystal Structure of the [Cu(L)(μ-Cl)CuCl3]•iso-PrOH Solvate

The Cu2LCl4 complex (I) with chiral bis{(E)-[(1S,4R)-Delta(7,8)-1-amino-2-para-menthalidene]aminohydroxy} methane (L - a derivative of natural monoterpenoid (R)-(+)-limonene) is synthesized. The crystal structure of the solvate of complex I [Cu(L)(mu-Cl)CuCl3] center dot iso-PrOH (II) is determined by X-ray diffraction analysis. Structure II is based on molecules of the [Cu(L)(mu-Cl)CuCl3] binuclear complexes in which L is the tetradentate cycle-forming ligand. One Cl atom manifests the bridging function. The CuN4Cl coordination unit is a square pyramid, and CuCl 4 is a distorted tetrahedron. The iso-PrOH molecules are localized in cavities between the layers of structure II. The mu(eff) value for complex I is 2.56 mu B and indicates the absence of an appreciable interaction between the Cu2+ ions in the Cu(II)-Cl-Cu(II) exchange cluster. The compound CuLCl2 center dot H2O (III) is synthesized. The mu(eff) value for compound III is 1.6 mu B. Complexes I and III are studied by EPR and IR spectroscopy.