• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Chemistry: A European journal >Binuclear Complexes as Building Blocks for Polynuclear Complexes with High-Spin Ground States: Synthesis and Structure of a Tetranuclear Nickel Complex with an S=4 Ground State
【24h】

Binuclear Complexes as Building Blocks for Polynuclear Complexes with High-Spin Ground States: Synthesis and Structure of a Tetranuclear Nickel Complex with an S=4 Ground State

机译：双核配合物作为具有高旋转基态的多核配合物的构建基块：具有S = 4基态的四核镍配合物的合成和结构

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

The coordinatively unsaturated dinickel(II) complex [(L~2)Ni_2](BPh_4)_2 (2), where (L~2)~(2-) represents the dianionic form of the 'N_4S_2' ligand N,N'-bis(2-thio-3-aminomethyl-5-tert-butylbenzyl)-propane-1,3-diamine), has been investigated with respect to its ability to function as a building block for the preparation of polynuclear nickel complexes with a high-spin ground state. Treatment of 2 with pyridazine (pydz) followed by addition of two equivalents of NH_4SCN afforded the dinuclear #mu#-pyridazine complex [(L~2)Ni_2](#mu#-pydz)(NCS)_2] (4). The reaction of 2 with pyridazine and NaN_3 in a 1:1:1 molar ratio gave the tetranuclear nicker(II) complex [{(L~2)Ni_2](#mu#-pydz)(N_3)}_2](BPh_4)_2 (5). Both complexes have been characterized by X-ray crystallography and variable-temperature magnetic susceptibility studies. In complex 4 two fac-(SCN)N_2Ni~(II) units are linked by two thiophenolate sulfur atoms and a #mu#-pydz ligand to give a (SCN)N_2Ni(#mu#-S)_2(#mu#-pydz)NiN_2(NCS) core structure with a pseudoconfacial bioctahedral geometry. The two NCS~- groups occupy opposite coordination sites, each is in a cis position to the pydz bridge. Analyses of the susceptibility data indicate the presence of an intramolecular ferromagnetic exchange interaction between the two Ni~(II) (S=1) ions. Complex 5 is composed of two binuclear [(L~2)Ni_2](#mu#-pydz)]~(2+) subunits which are linked by two azide ions to give a rectangular array of four six-coordinate Ni~(II) ions. The binuclear [(L~2)Ni_2](#mu#-pydz)]~(2+) fragments in 4 and 5 are isostructural. Analyses of the susceptibility data of 5 reveal ferromagnetic exchange interactions between the Ni~(II) ions of the binuclear subunit as well as for the #mu#_(1,3)-N_3-bridged Ni~(II) ions. Thus, compound 4 has an S=2 ground state, whereas in 5 it is S=4.
机译：配位不饱和二镍（II）配合物[（L〜2）Ni_2]（BPh_4）_2（2），其中（L〜2）〜（2-）表示'N_4S_2'配体N，N'-已经研究了双（2-硫代-3-氨基甲基-5-叔丁基苄基）丙烷-1,3-二胺的功能，以其作为制备高含量多核镍配合物的基础。 -旋转基态。用哒嗪（pydz）处理2，然后加入两当量的NH_4SCN，得到双核＃mu＃-哒嗪络合物[（L〜2）Ni_2]（＃mu＃-pydz）（NCS）_2]（4）。 2与吡嗪和NaN_3的摩尔比为1：1：1的反应生成了四核nicker（II）配合物[{（L〜2）Ni_2]（＃mu＃-pydz）（N_3）} _ 2]（BPh_4） _2（5）。两种配合物均已通过X射线晶体学和可变温度磁化率研究进行了表征。在配合物4中，两个fac-（SCN）N_2Ni〜（II）单元通过两个硫酚盐硫原子和＃mu＃-pydz配体相连，得到（SCN）N_2Ni（＃mu＃-S）_2（＃mu＃- pydz）NiN_2（NCS）核心结构，具有伪圆锥形的二十面体几何形状。这两个NCS〜-组占据相反的配位点，每个位点都位于pydz桥的顺式位置。磁化率数据分析表明，在两个Ni〜（II）（S = 1）离子之间存在分子内铁磁交换相互作用。配合物5由两个双核[（L〜2）Ni_2]（＃mu＃-pydz）]〜（2+）亚基组成，这些亚基通过两个叠氮化物离子连接而形成四个六坐标Ni〜（II ）离子。 4和5中的双核[（L〜2）Ni_2]（＃mu＃-pydz）]（2+）片段是同构的。对5的磁化率数据的分析揭示了双核亚基的Ni〜（II）离子与#mu #_（1,3）-N_3桥连的Ni〜（II）离子之间的铁磁交换相互作用。因此，化合物4具有S = 2基态，而在化合物5中则为S = 4。

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