有机化学 ›› 2020, Vol. 40 ›› Issue (10): 3380-3389.DOI: 10.6023/cjoc202005089 上一篇    下一篇

研究论文

三脚架型二胺基-膦配体支撑的亚铁配合物与有机重氮化合物的反应

刘健, 肖洁, Sudipta Mondal, 冷雪冰, 邓亮   

  1. 中国科学院上海有机化学研究所 金属有机化学国家重点实验室 上海 200032
  • 收稿日期:2020-05-29 修回日期:2020-06-27 发布日期:2020-07-01
  • 通讯作者: 邓亮 E-mail:deng@sioc.ac.cn
  • 基金资助:
    科技部国家重点研发计划(No.2016YFA0202900)、国家自然科学基金(Nos.21725104,21690062,21821002)、中国科学院先导专项(No.XDB20000000)和上海市优秀学术带头人计划(No.19XD1424800)资助项目.

Reactions of Iron(II) Complexes Supported by Tripodal Amido-Phosphine-Amido Ligands with Diazo Compounds

Liu Jian, Xiao Jie, Mondal Sudipta, Leng Xuebing, Deng Liang   

  1. State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032
  • Received:2020-05-29 Revised:2020-06-27 Published:2020-07-01
  • Supported by:
    Project supported by the National Key Research and Development Program of the Ministry of Science and Technology (No. 2016YFA0202900), the Natural Science Foundation of China (Nos. 21725104, 21690062, 21821002), CAS Strategic Pilot Science And Technology Special (No. XDB20000000), and the Program of Shanghai Academic Research Leader (No. 19XD1424800).

通过ButPCl2与两倍量原位形成的邻位胺基取代苯基锂的反应合成了二胺基-膦配体H2MesN2PBu-t)和H2dcpN2PBu-t).利用H2MesN2PBu-t)和H2dcpN2PBu-t)与[Fe(N(SiMe322]2的胺消除反应合成得到二胺基-膦配位的高自旋亚铁配合物[(κ3-NNP-MesN2PBu-t)Fe(OEt2)](1)和[(κ3-NNP-dcpN2PBu-t)Fe(OEt2)](2).配合物1与重氮化合物(p-tolyl)2CN2和PhC(N2)CO2Et反应分别生成重氮配位的铁配合物[(κ3-NNP-MesN2PBu-t)Fe(η2-NN-(p-tolyl)2CN2)](3)和[(κ3-NNP-MesN2PBu-t)Fe(κ2-NO-PhC(N2)CO2Et)](4).配合物2可以催化重氮化合物(p-tolyl)2CN2转化为酮连氮化合物(p-tolyl)2-C=NN=C(tolyl-p2.配合物2与重氮化合物DmpC(N2)H反应生成二胺基-膦叶立德配位的高自旋亚铁配合物[(κ3-NNC-dcpN2PBu-tCH,Dmp)Fe](5).二胺基-膦配体H2MesN2PBu-t)和H2dcpN2PBu-t)以及配合物15通过了各种谱学数据的表征.其中配合物25的结构还通过单晶X射线衍射得到确认.理论计算显示配合物3可看作为低自旋型四价铁末端亚胺基配合物.配合物4的电子结构可描述为中间自旋的三价铁中心与重氮自由基阴离子反铁磁性耦合形成基态自旋为S=1的配合物.

关键词: 铁, 重氮化合物, 二胺基-膦配体

Treatment of ButPCl2 with 2 equiv. of (2,4,6-Me3C6H2)(2-LiC6H4)NLi and (2,6-Cl2C6H3)(2-LiC6H4)NLi, which were generated in situ by the interaction of (2,4,6-Me3C6H2)(2-BrC6H4)NH and (2,6-Cl2C6H3)(2-BrC6H4)NH with 2 equiv. of BunLi, followed by quenching with water, afforded new tridentate diamine-phosphine compounds (o-(N-(2,4,6-Me3C6H2)-NH)C6H4)2PBut and (o-(N-(2,6-Cl2C6H3)NH)C6H4)2PBut (denoted as H2(MesN2PBu-t) and H2(dcpN2PBu-t)), respectively. H2(MesN2PBu-t) and H2(dcpN2PBu-t) underwent amine-elimination reaction with[Fe(N(SiMe3)2)2]2 (0.5 equiv.) to afford iron(Ⅱ) complexes[(κ3-N,N,P-MesN2PBu-t)Fe(OEt2)] (1) and[(κ3-N,N,P-dcpN2PBu-t)Fe(OEt2)] (2) bearing tridentate diamido-phosphine ligands. Treatment of 1 with organic diazo compounds (p-tolyl)2CN2 and PhC(N2)CO2Et rendered the formation of diazo coordinated iron complexes[(κ3-N,N,P-MesN2PBu-t)Fe(η2-N,N-(p-tolyl)2CN2)] (3) and[(κ3-N,N,P-MesN2PBu-t)Fe(κ2-N,O-PhC(N2)- CO2Et)] (4), respectively. Complex 2 can catalyze the conversion of (p-tolyl)2CN2 to (p-tolyl)2C=NN=C(tolyl-p)2. Treatment of 2 with organic diazo compound DmpC(N2)H rendered the formation of a high-spin iron(Ⅱ) complex featuring the tridentate bisamido-phosphine ylide ligand[(κ3-N,N,C-dcpN2PBu-tCH,Dmp)Fe] (5). These complexes have been characterized by elemental analysis, 1H NMR, solution magnetic susceptibility measurements, zero-field 57Fe Mössbauer spectroscopy and single-crystal X-ray diffraction studies. The spectroscopic data in combination with theoretical study suggest that complex 3 can be viewed as a low-spin iron(IV) imido complex featuring an dianionic ligand[η2-N,N-(p-tolyl)2CN2]2-, whereas 4 has an intermediate-spin iron(Ⅲ) center that is antiferromagnetically coupled to a diazoalkane radical anion[κ2-N,O-PhC(N2)-CO2Et)]•1-.

Key words: iron, diazo compounds, diamido-phosphine ligand