...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Dimetallic complexes of acyclic pyridine-armed ligands derived from 3,6-diformylpyridazine
【24h】

Dimetallic complexes of acyclic pyridine-armed ligands derived from 3,6-diformylpyridazine

机译：衍生自3,6-二甲酰基哒嗪的无环吡啶武装的配体的双金属配合物

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A bis(pyridine-armed)acyclic Schiff base ligand L1 has been synthesised from 3,6-diformylpyridazine and two equivalents of 2-(2-aminoethyl)pyridine.Reduction of this ligand using NaBH4 resulted in the formation of the amine analogue L2.Complexes of the form [M_2L1((mu-X)]Y_2C1O_4 [where:M=Cu(II),X=OH~- and Y=C1O_4~-1,Cl~-2,Br~-3 or 1 4;M=Co(II),X=OH and Y=C1O_4 5;M=Ni(II),X=SCN~-6 or X=N_3~- 7 and Y=C1O_4 ],and [Cu__2L2(mu-OH)](ClO_4)_3 8 were prepared and characterised.The complexes 1 and 5-7 have been characterised by single-crystal X-ray diffraction.The acyclic ligand L1 provides three nitrogen donor atoms per metal centre,including a pyridazine bridge between the metal centres,and the anion X also bridges the two metal centres.As required,coordinating solvent molecules or additional anions make up the remainder of the coordination sphere.The two copper centres of 1 are very strongly antiferromagnetically coupled(2J=-1146 cm~-1)via the pyridazine and hydroxide ion bridges,whereas the competing antiferromagnetic pyridazine bridging pathway and ferromagnetic 1,1-bridging azide pathway resulted in the observation of weak antiferromagnetic exchange in the dinickel(II)complex 7(27=-14 cm~-1).Electrochemical examination of L1,L2 and complexes 1 and 5-8 revealed multiple redox processes.These have been tentatively assigned to a mixture of metal centred and ligand centred redox processes on the basis of cyclic voltammetry and coulometry results and comparisons with literature examples.
机译：由3,6-二甲酰基哒嗪和2当量的2-（2-氨基乙基）吡啶合成了一个双（吡啶武装）无环席夫碱配体L1，使用NaBH4还原该配体导致形成了胺类似物L2。 [M_2L1（（mu-X）] Y_2C1O_4 [其中：M = Cu（II），X = OH〜-，Y = ClO_4〜-1，Cl〜-2，Br〜-3或1 4; M ＝ Co（II），X ＝ OH，且Y ＝ C1O_4 5; M ＝ Ni（II），X ＝ SCN〜-6或X ＝ N_3〜-7，且Y ＝ C1O_4]，和[Cu__2L2（mu-OH）制备并表征]（ClO_4）_38。配合物1和5-7通过单晶X射线衍射表征。无环配体L1在每个金属中心提供三个氮供体原子，包括金属之间的哒嗪桥中心，阴离子X也桥接两个金属中心。根据需要，配位溶剂分子或其他阴离子组成了配位球的其余部分。两个铜中心1的反铁磁耦合非常强（2J = -1146 cm〜- 1）通过哒嗪和氢氧根离子桥，竞争的反铁磁性哒嗪桥接途径和铁磁性1,1桥接叠氮化物途径导致在二镍（II）配合物7（27 = -14 cm〜-1）中观察到弱的反铁磁性交换.L1，L2和配合物的电化学检测图1和5-8揭示了多个氧化还原过程，根据循环伏安法和库仑法的结果以及与文献实例的比较，已将它们暂定为以金属为中心和以配体为中心的混合过程。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号