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Structure, magnetism and catecholase activity of the first dicopper(II) complex having a single mu-alkoxo bridge

机译:具有单个mu-烷氧基桥的第一个Dicopper(II)配合物的结构,磁性和儿茶酚酶活性

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Pyridine-2,6-dimethanol (H2L), which is a versatile donor has a neutral, monoanionic and dianionic coordination behaviour with two different coordination modes viz. tridentate and bidentate towards Cu(II), leading to three different geometric environments around Cu(II) centers. The single crystal X-ray structure reveals two different Cu(II) complexes with H2L: in the first case ClO4- forms a polymer through intermolecular H-bonding, [Cu(H2L)(HL)]ClO4 (1) while the other one is the first report of a mono mu-alkoxo bridged dicopper(II) complex, [Cu(H2L)(HL) Cu(L)]+(2). The crystallographic asymmetric unit of 2 contains a mononuclear cation [Cu(H2L)(HL)]+ and a dinuclear [Cu(H2L)(HL) Cu(L)]+ unit along with two perchlorate anions, formulated as [Cu(H2L)(HL)][Cu-2(H2L)(HL)(L)] (ClO4)(2). The magnetic characterization of 2 shows a very weak antiferromagnetic coupling between the Cu(II) centers in the dinuclear unit. This is the first report on the magnetic characterization of the first mono alkoxo-bridged dinuclear Cu(II) complex and, hence needs further examples to firmly establish magneto-structural correlations. The efficient catecholase activity of 2 (k(cat) -2.08 x 10(4) h(-1)) is attributed to the presence of a mono mu-alkoxo bridge, which holds two Cu(II) centers similar to 3.26 angstrom apart and possibly facilitates the binding of catecholate during the electron transfer reaction. Moreover, the Cu-2 center is square planar, and provides one free position for coordination by the substrate molecule.
机译:吡啶-2,6-二甲醇(H2L)是一种多用途供体,具有中性,单阴离子和双阴离子配位行为,具有两种不同的配位模式。三齿形和双齿形的Cu(II),导致Cu(II)中心周围的三个不同的几何环境。单晶X射线结构揭示了与H2L有两种不同的Cu(II)配合物:在第一种情况下,ClO4-通过分子间H键形成[Cu(H2L)(HL)] ClO4(1)形成聚合物。是单mu-烷氧基桥接双铜(II)配合物[Cu(H2L)(HL)Cu(L)] +(2)的首次报道。 2的晶体学不对称单元包含一个单核阳离子[Cu(H2L)(HL)] +和一个双核[Cu(H2L)(HL)Cu(L)] +单元以及两个高氯酸根阴离子,配制成[Cu(H2L )(HL)] [Cu-2(H2L)(HL)(L)](ClO4)(2)。 2的磁性表征显示双核单元中Cu(II)中心之间的反铁磁耦合非常弱。这是有关第一个单烷氧基桥接的双核Cu(II)配合物的磁性表征的第一份报告,因此需要进一步的实例来牢固地建立磁结构相关性。 2(k(cat)-2.08 x 10(4)h(-1))的有效儿茶酚酶活性归因于一个单mu-alkoxo桥的存在,该桥拥有两个Cu(II)中心,相距3.26埃并可能促进电子转移反应过程中儿茶酚酸酯的结合。而且,Cu-2中心是正方形平面,并提供了一个自由位置供底物分子配位。

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