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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Guanine-containing copper(II)complexes:synthesis,X-ray structures and magnetic properties
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Guanine-containing copper(II)complexes:synthesis,X-ray structures and magnetic properties

机译：含鸟嘌呤的铜（II）配合物：合成，X射线结构和磁性

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Three new compounds of formula{[Cu(gua)(H2O)3](BF4)(SiF6)1/2}_n(1),{[Cu(gua)(H2O)3](CF3SO3)2·H2O}_n(2)and[Cu(gua)2(H2O)(HCOO)]ClO4·H2O1/2HCOOH](3)[gua=2-amino-1H-purin-6(9H)-one]showing the unprecedented coordination of neutral guanine,have been synthesised and structurally characterized.The structures of the compounds 1 and 2 contain uniform copper(II)chains of formula[Cu(gua)(H2O)3]_n~(2n+),where the copper atoms are bridged by guanine ligands coordinated via N(3)and N(7).The electroneutrality is achieved by uncoordinated tetrafluoroborate and hexafluorosilicate(1)and triflate(2).Each copper atom in 1 and 2 is five-coordinated in a distorted square pyramidal environment:two water molecules in trans positions and the N(3)and N(7a)nitrogen atoms of two guanine ligands build the basal plane whereas a water molecule fills the axial position.The values of the copper-copper separation across the bridging guanine ligand are 7.183(1)(1)and 7.123(1)A(2).3 is an ionic salt whose structure is made up of mononuclear[Cu(gua)2(H2O)(HCOO)]~+cations and perchlorate anions plus water and formic acid as crystallization molecules.The two guanine ligands in the cation are coordinated to the copper centre through the N(9)atom.The copper atom in 3 is four-coordinated with two monodentate guanine molecules in the trans position,a water molecule and a monodenate formate ligand building a quasi square planar surrounding.Magnetic susceptibility measurements for 1 and 2 in the temperature range 1.9-300 K show the occurrence of significant mtrachain antiferromagnetic interactions between the copper(II)ions across the guanine bridge[J=-9.6(1)(1)and-10.3(1)cm~(-1)(2)with H=-J SIGMA_i S_i·S_(i+1)].
机译：三种新的化学式为{[Cu（gua）（H2O）3]（BF4）（SiF6）1/2} _n（1），{[Cu（gua）（H2O）3]（CF3SO3）2·H2O} _n （2）和[Cu（gua）2（H2O）（HCOO）] ClO4·H2O1 / 2HCOOH]（3）[gua = 2-氨基-1H-嘌呤-6（9H）-一个]显示中性的前所未有的配位化合物1和2的结构含有式[Cu（gua）（H2O）3] _n〜（2n +）的均匀铜（II）链，其中铜原子被鸟嘌呤桥连。配体通过N（3）和N（7）进行配位。电子中性是通过不配位的四氟硼酸酯和六氟硅酸盐（1）和三氟甲磺酸酯（2）实现的.1和2中的每个铜原子在扭曲的方形金字塔环境中均是五配位的：两个反位的水分子和两个鸟嘌呤配体的N（3）和N（7a）氮原子构成基础平面，而水分子填充轴向位点。跨鸟嘌呤配体的铜-铜分离值为7.183 （1）（1）和7.123（1）A（2）.3是结构为m的离子盐由单核[Cu（gua）2（H2O）（HCOO）] +阳离子和高氯酸根阴离子加水和甲酸作为结晶分子。阳离子中的两个鸟嘌呤配体通过N（9）与铜中心配位原子.3中的铜原子与四个单配位鸟嘌呤分子在反式位置四配位，一个水分子和一个单齿甲酸盐配体构成一个准方形平面周围环境。在1.9-温度范围内测量1和2的磁化率300 K表明在鸟嘌呤桥上的铜（II）离子之间存在明显的超链反铁磁相互作用[J = -9.6（1）（1）和-10.3（1）cm〜（-1）（2），H = -J SIGMA_i S_i·S_（i + 1）]。

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