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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Unique trapping of paddlewheel copper(II) carboxylate by ligand-bound {Cu-2} fragments for [Cu-6] assembly
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Unique trapping of paddlewheel copper(II) carboxylate by ligand-bound {Cu-2} fragments for [Cu-6] assembly

机译:配体结合的{Cu-2}片段对[Cu-6]组装的轮式羧酸铜(II)的独特捕获

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摘要

The bridging nature of in situ generated hydroxide ions and carboxylates (RCOO-; R = CH3, C2H5, CH2Ph) has been utilized to design a new family of [Cu-6] coordination complexes: [Cu-6(mu(3)-OH)(2)(mu-H2L)(2)(mu(1,1,3)-O2CCH3)(2)(mu(1,3)-O2CCH3)(2)(mu-ClO4)(2)](ClO4)(2)center dot H2O (1), [Cu-6(mu(3)-OH)(2)(mu-H2L)(2)(mu(1,1,3)-O2CC2H5)(4)(mu-ClO4)(2)] (ClO4)(2)center dot 2H(2)O (2) and [Cu-6(mu(3)-OH)(2)(mu-H2L)(2)(mu(1,3)-O2CCH2Ph)(4)(ClO4)(2)](ClO4)(2)center dot 2H(2)O (3). Tetracarboxylate bridged {Cu-2} core units are trapped between two ligand-bound {Cu-2(mu-H2L)(mu-OH)}(2+) subunits forming the [Cu-6] complexes. The hexanuclear {Cu-6(mu(3)-OH)(2)(H2L)(2)(mu-O2CR)(4)}(4+) cores having six interconnected Cu-II ions assume a hitherto unknown dumbbell-shaped topology. Detailed characterizations have been done using X-ray crystallography and variable temperature magnetic measurements. For complexes 1-3, the dominant coupling constant (J') values between carboxylate bridged copper centers are -36.2 to -45.2 cm(-1) for short Cu center dot center dot center dot Cu separations of 2.540-2.578 angstrom. In MeCN solutions all three complexes showed catalytic oxidation of 3,5-di-tert-butyl catechol (3,5-DTBCH2) in air.
机译:原位产生的氢氧根离子和羧酸根(RCOO-; R = CH3,C2H5,CH2Ph)的桥联性质已被用于设计[Cu-6]配位化合物的新家族:[Cu-6(mu(3)- OH)(2)(mu-H2L)(2)(mu(1,1,3)-O2CCH3)(2)(mu(1,3)-O2CCH3)(2)(mu-ClO4)(2)]] (ClO4)(2)中心点H2O(1),[Cu-6(mu(3)-OH)(2)(mu-H2L)(2)(mu(1,1,3)-O2CC2H5)(4 )(mu-ClO4)(2)](ClO4)(2)中心点2H(2)O(2)和[Cu-6(mu(3)-OH)(2)(mu-H2L)(2) (mu(1,3)-O2CCH2Ph)(4)(ClO4)(2)](ClO4)(2)中心点2H(2)O(3)。四羧酸桥联的{Cu-2}核心单元被困在形成[Cu-6]配合物的两个配体结合{Cu-2(mu-H2L)(mu-OH)}(2+)亚基之间。具有六个相互连接的Cu-II离子的六核{Cu-6(mu(3)-OH)(2)(H2L)(2)(mu-O2CR)(4)}(4+)磁芯采用迄今未知的哑铃形形拓扑。使用X射线晶体学和可变温度磁测量已经完成了详细的表征。对于配合物1-3,对于2.540-2.578埃的短Cu中心点中心点中心点Cu间距,羧酸盐桥接的铜中心之间的主要偶合常数(J')值为-36.2至-45.2 cm(-1)。在MeCN溶液中,所有三种络合物在空气中均显示3,5-二叔丁基邻苯二酚(3,5-DTBCH2)的催化氧化。

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