Synthesis and Properties of Cu(II) and Pd(II) Complexeswith Chiral Bis-α-sulfanyl Oxyraes,the Derivatives of Natural Monoterpene, α-Pinene

摘要

Coordination compounds Cu2(H2L~1)Cl4 (I), Pd2(H2L~1)Cl4 (II), Cu2(H2L~2)Cl4 (III), and Pd2(H2L~2) Cl4 (IV) with chiral bis-α-sulfanyloximes, the derivatives of the monoterpenoid (-)-α-pinene, were obtained. The complexes I and III are paramagnetic (μ_(eff) = 2.45 and 2.67 μ_B, respectively), II and IV are diamagnetic. According to IR spectroscopy, in the compounds I-IV the nearest environment of Cu and Pd atoms includes N, S, and Cl atoms. The values of μ_(eff) and parameters of ESR spectra of the solid phase and solutions of I and III show a binuclear structure of the Cu(II) complexes. Parameters of the ~1H and ~(13)C NMR spectra of compounds II and IV indicate the formation of binuclear Pd(II) complexes of C2 symmetry and the closure of five-membered chelate rings PdNSC2. The PdCl2 fragments are in transoid position. H2L~1 and H2L~2 are tetradentate bridging chelating ligands.