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Abstract <p>Two new copper(II) complexes, [Cu<sub>2</sub>(L<sup>a</sup>)<sub>2</sub>(OAc)<sub>2</sub>]·2H<sub>2</sub>O (<b>1</b>) and [Cu(L<sup>b</sup>)<sub>2</sub>] (<b>2</b>), where L<sup>a</sup> and L<sup>b</sup> are the deprotonated monoanionic form of 5-bromo-2-(ethylaminoethylimino)methyl)phenol (HL<sup>a</sup>) and 5-bromo-2-cyclohexyliminomethylphenol (HL<sup>b</sup>), respectively, have been synthesized and characterized by elemental analysis, infrared and electronic spectroscopy. Structures of both complexes were further determined by single crystal X-ray diffraction. Complexes <b>1</b> and <b>2</b> were synthesized from copper acetate with HL<sup>a</sup> and HL<sup>b</sup>, respectively in methanol. The Cu atoms in complex <b>1</b> are in octahedral coordination, while that in <b>2</b> is in square planar coordination. The two complexes have high catalytic property for the epoxidation of styrene, with conversions over 90% and selectivity over 85%.</p>

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Synthesis, Characterization and X-Ray Crystal Structures of Two Schiff Base Copper(II) Complexes with Catalytic Property

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • Z. Hu,
  • Q. -W. Yang,
  • Y. -C. Zhou,
  • Y. -L. Ren,
  • Y. Lei

摘要

Abstract

Two new copper(II) complexes, [Cu2(La)2(OAc)2]·2H2O (1) and [Cu(Lb)2] (2), where La and Lb are the deprotonated monoanionic form of 5-bromo-2-(ethylaminoethylimino)methyl)phenol (HLa) and 5-bromo-2-cyclohexyliminomethylphenol (HLb), respectively, have been synthesized and characterized by elemental analysis, infrared and electronic spectroscopy. Structures of both complexes were further determined by single crystal X-ray diffraction. Complexes 1 and 2 were synthesized from copper acetate with HLa and HLb, respectively in methanol. The Cu atoms in complex 1 are in octahedral coordination, while that in 2 is in square planar coordination. The two complexes have high catalytic property for the epoxidation of styrene, with conversions over 90% and selectivity over 85%.