One-dimensional chain copper(II) complex: Synthesis, X-ray crystal structure and catalytic activity in the epoxidation of styrene

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• 作者：Debraj Saha ; Tanmoy Maity ; Tirthankar Dey ; Subratanath Koner ; ^{snkoner@chemistry.jdvu.ac.in}
• 关键词：Copper(II) ; Helical chain compound ; Schiff-base complex ; Hydrogen peroxide ; Epoxidation ; Styrene
• 刊名：Polyhedron
• 出版年：2012
• 期刊代码：87_02775387
• 类别：ch
• 出版时间：16 March, 2012
• 卷：35
• 期：1
• 页码：55-61
• 文件大小：722 K

摘要

Two new copper(II) complexes, [Cu(HL¹)(NO₃)] (1) (H₂L¹ = 1-(N-ortho-hydroxyacetophenimine)-ethane-2-ol) and {[Mg(H₂O)₆][Cu(pydca)₂]路2H₂O}_n (2) (H₂pydca = 2,5-pyridine dicarboxylic acid) have been synthesized and characterized. X-ray crystal structure analysis reveals that the geometry of complex 1 is square planar, where copper(II) centers are linked through a weak coordination by the nitrate O atoms occupying two axial positions, resulting a helical chain structure. Complex 1 crystallizes in the chiral space group P2₁. There is no chiral center in the Schiff-base ligand of 1, its helical structure develops due to the formation of a NO₃^{鈭?/sup> bridged chain through an asymmetric arrangement. Complex 2 is a 1D chain in which the copper(II) ions are connected by bridging carboxylato ligands. The [Mg(H₂O)₆]2+ moiety occupies the inter-chain space. Epoxidation reactions of styrene and substituted styrenes are homogeneously catalyzed by complexes 1 and 2 with H₂O₂ as the oxidant.}