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咪唑啉-2-亚胺基四价铈、铽和镨配合物的合成与结构

Imidazolin-2-Iminato Tetravalent Cerium,Terbium and Praseodymium Complexes:Synthesis and Structure

【作者】 王宁

【导师】 陈耀峰;

【作者基本信息】 中国科学技术大学 , 有机化学, 2023, 硕士

【摘要】 本论文主要研究了咪唑啉-2-亚胺基四价铈配合物的合成与结构,同时对咪唑啉-2-亚胺基四价铽和四价镨配合物的合成进行了探索,主要内容如下:1.通过三价铈氯化物CeCl3和3当量双三甲基硅基胺基钾KN(SiMe32的盐消除反应合成了三价铈三胺基配合物Ce[N(SiMe32]3。随后通过三价铈三胺基配合物和咪唑啉-2-亚胺 HN=C{N(Mes)CHCHN(Mes)},HN=C{(N(tBu)CHCHN(tBu)}或HN=C{(N(iPr)CHCHN(iPr)}的质解反应合成了咪唑啉-2-亚胺基三价铈配合物[(ImMesN)(ImMesNH)Ce{N(SiMe32}2](1),[(ImtBuN)2(ImtBuNH)Ce{N(SiMe32}](2)和[(ImiPrN)2(ImiPrNH)Ce(μ-ImiPrN)]2(4)。配合物中咪唑啉-2-亚胺基的数目受咪唑啉-2-亚胺基氮原子上取代基的位阻控制。研究了所合成的咪唑啉-2-亚胺基三价铈配合物与不同氧化剂的反应,最终通过配合物1和2分别与Ph3CCl的反应合成了咪唑啉-2-亚胺基四价铈配合物[(ImMesN)2Ce{N(SiMe32}Cl](5)和[(ImtBuN)3CeCl](6),以及通过配合物 4 与 C2Cl6的反应合成了咪唑啉-2-亚胺基四价铈配合物[(ImiPrN)2Ce(μ-ImiPrN)Cl]2(7)。培养得到1、2以及4-7的单晶,并对其进行了单晶X-射线衍射表征。2.通过咪唑啉-2-亚胺基四价铈配合物5与炔基锂(PhCCLi)的反应合成了四价铈炔基配合物[(ImMesN)2Ce{N(SiMe32}CCPh](8),并对该配合物进行了单晶X-射线衍射表征。研究了配合物5与苯基锂(PhLi)以及烷基锂(LiCH2SiMe2Ph)的反应,发现所生成的四价铈苯基和烷基非常不稳定,未能实现对这两种配合物的分离和表征。此外,通过咪唑啉-2-亚胺基四价铈配合物6与PhCCLi和PhLi的反应合成四价铈炔基配合物[(ImtBuN)3CeCCPh](9)以及四价铈芳基配合物[(ImtBuN)3CePh](10),对配合物9和10也进行了单晶X-射线衍射表征。3.通过三价铽三胺基配合物Tb[N(SiMe32]3和咪唑啉-2-亚胺HN=C{N(Mes)CHCHN(Mes)}或 N=C{(N(tBu)CHCHN(tBu)的质解反应合成了咪唑啉-2-亚胺基三价铽配合物[(ImMesN)(ImMesNH)Tb{N(SiMe32}2](12)和(ImtBuN)2(ImtBuNH)Tb{N(SiMe32}](13),并通过三价铽氯化物TbCl3和3当量ImMesNLi的盐消除反应合成了三咪唑啉-2-亚胺基三价铽配合物[(ImMesN)3Tb(THF)2](14)。采用相同方法,合成了咪唑啉-2-亚胺基三价镨配合物[(ImMesN)(ImMesNH)Pr{N(SiMe32}2](15)和[(ImtBuN)2(ImtBuNH)Pr{N(SiMe32}](16)。配合物16与2当量4-二甲氨基吡啶(DMAP)发生胺消除反应,生成三价镨配合物[(ImtBuN)3Pr(DMAP)2](17)。培养得到配合物12-17的单晶,并对其进行了单晶X-射线衍射表征。研究了咪唑啉-2-亚胺基三价铽和镨配合物与多种氧化剂的反应,但截至目前还未能获得咪唑啉-2-亚胺基四价铽和镨配合物。

【Abstract】 This dissertation,the synthesis and structure of imidazolin-2-iminato tetravalent cerium complexes were studied,and the synthesis of imidazolin-2-iminato tetravalent terbium and tetravalent praseodymium complexes were also explored.1.The cerium(Ⅲ)amide Ce[N(SiMe32]3 was synthesized by salt elimination of CeCl3 with 3 equivalents of KN(SiMe32.Ce[N(SiMe32]3 reacted with imidazolin-2imines(HN=C{N(Mes)CHCHN(Mes)},HN=C{(N(tBu)CHCHN(tBu)} or HN=C{(N(iPr)CHCHN(iPr)} to yield imidazolin-2-iminato cerium(Ⅲ)complexes[(ImMesN)(ImMesNH)Ce{N(SiMe32}2](1),[(ImtBuN)2(ImtBuNH)Ce{N(SiMe32}](2)and[(ImiPrN)2(ImiPrNH)Ce(μ-ImiPrN)]2(4),respectively.The number of imidazolin-2iminato ligands(ImRN-)coordinated to the cerium center has a clear correlation with the steric bulk of the R substituents of the imidazolin-2-iminato ligands.Oxidation of imidazolin-2-iminato cerium(Ⅲ)complexes 1,2 and 4 with PhICl2,Ph3CCl or C2Cl6 was investigated.The imidazolin-2-iminato cerium(Ⅳ)chlorides[(ImMesN)2Ce{N(SiMe32}Cl](5)and[(ImiBuN)3CeCl](6)were synthesized by the reactions of Ph3CCl with 1 and 2,respectively;the imidazolin-2-iminato cerium(Ⅳ)chloride[(ImiPr)2Ce(μ-ImiPrN)Cl]2(7)was synthesized by the reaction of C2Cl6 with 4.Complexes 1,2 and 4 to 7 were all characterized by single crystal X-ray diffraction.2.Reaction of imidazolin-2-iminato cerium(Ⅳ)chloride 5 with PhCCLi provided cerium(Ⅳ)alkynyl complex[(ImMesN)2Ce{N(SiMe32}CCPh](8),which was characterized by single crystal X-ray diffraction.However,the synthesis of corresponding cerium(Ⅳ)aryl and alkyl complexes failed due to the high instability of the complexes.Reactions of imidazolin-2-iminato cerium(Ⅳ)complex 6 with PhCCLi and LiPh gave cerium(Ⅳ)alkynyl and aryl complexes[(ImtBuN)3CeCCPh](9)and[(ImtBuN)3CePh](10),respectively.Complexes 9 and 10 were characterized by single crystal X-ray diffraction.3.The trivalent terbium(Ⅲ)amide Tb[N(SiMe32]3 reacted with imidazolin-2imines(HN=C{N(Mes)CHCHN(Mes)} or HN=C{(N(tBu)CHCHN(tBu)} to yield imidazolin-2-iminato terbium(Ⅲ)complexes[(ImMesN)(ImMesNH)Tb{N(SiMe32}2](12)and[(ImtBuN)2(ImtBuNH)Tb{N(SiMe32}](13)via amine elimination.Salt elimination of terbium trichloride TbCl3 with 3 equivalents of ImMesNLi afforded imidazolin-2-iminato terbium(Ⅲ)complex[(ImMesN)3Tb(THF)2](14).Imidazolin-2iminato praseodymium(Ⅲ)complexes[(ImMesN)(ImMesNH)Pr{N(SiMe32}2](15)and[(ImtBuN)2(ImtBuNH)Pr{N(SiMe32}](16)were prepared in a similar method.Complex 16 reacted with 2 equivalents of 4-dimethylamino pyridine(DMAP)to generate praseodymium(Ⅲ)complex[(ImtBuN)3Pr(DMAP)2](17).Complexes 12-17 were characterized by single crystal X-ray diffraction.Oxidation of imidazolin-2-iminato terbium(Ⅲ)and praseodymium(Ⅲ)complexes with various oxidants was investigated,however,no imidazolin-2-iminato terbium(Ⅳ)and praseodymium(Ⅳ)complexes have been obtained.

  • 【分类号】O641.4
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