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首页> 外文期刊>Polyhedron: The International Journal for Inorganic and Organometallic Chemistry >Using HgX2 units (X = Cl, CN) to increase structural and magnetic dimensionality in conjunction with (2,2 '-bipyridyl)copper(II) building blocks
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Using HgX2 units (X = Cl, CN) to increase structural and magnetic dimensionality in conjunction with (2,2 '-bipyridyl)copper(II) building blocks

机译:使用HgX2单元(X = Cl,CN)结合(2,2'-联吡啶基)铜(II)构件来增加结构和磁性尺寸

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A series of complexes containing (bipy)nCuCl(2) units (bipy = 2,2'-bipyridyl; n = 1,2) and linear, neutral Hg(CN)(2) or HgCl2 building blocks have been synthesized and structurally characterized. Generally, the Lewis acidic HgX2 moieties accept chloride ligands from the copper(II) center, in some cases increasing the structural and magnetic dimensionality of the system as a result. [Cu(bipy)(2)(mu-Cl)(2)Hg(CN)(2)] (1) is a molecular complex in which the chloride ligands bridge the copper(II) and mercury(II) centers. [Cu(bipy)(2)Hg2Cl6](2) (2) contains two copper(II) centers connected by an [Hg4Cl12](4-) bridge, that was generated by chloride migration from the harder copper(II) to the softer, highly Lewis acidic HgCl2 group. N-cyano coordination from Hg(CN)(2) in {[Cu(bipy)Hg(CN)(2)Cl-2](2)Hg(CN)(2)} (3) generates a "Chinese-kite" type Cu2Hg2 rectangular cluster. The clusters are connected to form a ID chain by Hg(CN)2 groups, that accept bridging chloride ligands from adjoining clusters. The crystallization of (bipy)CuCl2/Hg(CN)(2)-containing complexes from aqueous NH4OH yields I D {[Cu(bipy)(OH)(Cl)](2)Hg(CN)(2)}.2H(2)O (4) which is composed of [(bipy)Cu(OH)(Cl)](2) units bridged by Hg(CN)(2) moieties. The variable temperature magnetic susceptibility of 3 can be fitted to the theoretical expression for a I D antiferromagnetic chain of S = 1/2 centers with alternating interaction pathways (J -0.92 cm(-1), alpha = 0.17, g = 2.26). For 4, mu(eff) increases with decreasing temperature to a maximum and then decreases; fitting with the Bleaney-Bowers model for copper(11) dimers with weak antiferromagnetic interdimer interactions yielded J = 56.3 cm(-1), zJ' = 0.06 cm(-1) and g = 2.23. Complexes 3 and 4 are examples of coordination polymers with the rarely used Hg(CN)(2) building block. (C) 2003 Elsevier Science Ltd. All rights reserved. [References: 54]
机译:合成了一系列包含(bipy)nCuCl(2)单元(bipy = 2,2'-bipyridyl; n = 1,2)和线性,中性的Hg(CN)(2)或HgCl2结构单元的配合物。通常,路易斯酸性HgX2部分从铜(II)中心接受氯化物配体,因此在某些情况下会增加系统的结构和磁性。 [Cu(bipy)(2)(mu-Cl)(2)Hg(CN)(2)](1)是一种分子络合物,其中的氯化物配体桥接了铜(II)和汞(II)中心。 [Cu(bipy)(2)Hg2Cl6](2)(2)包含两个通过[Hg4Cl12](4-)桥连接的铜(II)中心,该中心是由氯化物从较硬的铜(II)迁移至金属更柔软的高路易斯酸性HgCl2基团。从{[Cu(bipy)Hg(CN)(2)Cl-2](2)Hg(CN)(2)}(3)中的Hg(CN)(2)进行N-氰基配位生成“中国风筝型Cu2Hg2矩形簇。簇通过Hg(CN)2基团连接形成ID链,该Hg(CN)2基团接受来自相邻簇的桥接氯化物配体。从NH4OH水溶液中结晶(bipy)CuCl2 / Hg(CN)(2)的络合物,产生ID {[[Cu(bipy)(OH)(Cl)](2)Hg(CN)(2)}。2H( 2)O(4),由由Hg(CN)(2)部分桥接的[(bipy)Cu(OH)(Cl)](2)单元组成。 3的可变温度磁化率可以与S = 1/2中心的ID反铁磁链具有交替的相互作用途径(J -0.92 cm(-1),alpha = 0.17,g = 2.26)的理论表达式相符。对于4,mu(eff)随温度降低到最大而增加,然后降低;用Bleaney-Bowers模型拟合弱反铁磁性二聚体相互作用的铜(11)二聚体产生J = 56.3 cm(-1),zJ'= 0.06 cm(-1)和g = 2.23。配合物3和4是具有很少使用的Hg(CN)(2)结构单元的配位聚合物的实例。 (C)2003 Elsevier ScienceLtd。保留所有权利。 [参考:54]

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