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)(NOb>3b>)] (class="boldFont">1) (Hb>2b>L¹ = 1-(N-ortho-hydroxyacetophenimine)-ethane-2-ol) and {[Mg(Hb>2b>O)b>6b>][Cu(pydca)b>2b>]路2Hb>2b>O}b>nb> (class="boldFont">2) (Hb>2b>pydca = 2,5-pyridine dicarboxylic acid) have been synthesized and characterized. X-ray crystal structure analysis reveals that the geometry of complex class="boldFont">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 class="boldFont">1 crystallizes in the chiral space group P2b>1b>. There is no chiral center in the Schiff-base ligand of class="boldFont">1, its helical structure develops due to the formation of a NOb>3b>^{鈭?/sup> bridged chain through an asymmetric arrangement. Complex class="boldFont">2 is a 1D chain in which the copper(II) ions are connected by bridging carboxylato ligands. The [Mg(Hb>2b>O)b>6b>]2+ moiety occupies the inter-chain space. Epoxidation reactions of styrene and substituted styrenes are homogeneously catalyzed by complexes class="boldFont">1 and class="boldFont">2 with Hb>2b>Ob>2b> as the oxidant.}