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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Mono- and dimeric complexes of an asymmetric heterotopic P,C-NHC,pyr ligand
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Mono- and dimeric complexes of an asymmetric heterotopic P,C-NHC,pyr ligand

机译:不对称异位P,C-NHC,pyr配体的单和二聚体复合物

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摘要

An asymmetric heterotopic ligand (S-(NCP)-C-Me) containing a central bicyclic, expanded-ring NHC with one pyridyl and one phosphine exo-substituent has been synthesised and its coordination chemistry with selected late transition metals investigated. The amidinium precursor [S-(NCHP)-C-Me] PF6 shows variable coordination modes with Ag(I), Cu(I) and Au(I) depending on the L : M ratio. The reaction of two mols of [S-(NCHP)-C-Me] PF6 with [Cu(MeCN)(4)] BF4, AgBF4 or Au(THT) Cl gives the bis-ligand complexes [Cu(kappa-P-(NCHP)-C-Me)(2)(CH3CN)(2)]BF4,center dot(PF6)(2), 1, and [M(kappa-P-(NCHP)-C-Me)(2)] X center dot(PF6)(2) (3: M = Ag, X = BF4; 6: M = Au, X = Cl) respectively. The 1 : 1 reaction of [S-(NCHP)-C-Me]PF6 with AgOTf gave the head-to-tail dimer H, T-[Ag-2(mu-N,P-(NCHP)-C-Me)(2)(mu-OTf) (2)](PF6)(2), 2, whereas the analogous reaction with Au(THT)Cl gave monomeric [Au(kappa-P-(NCHP)-C-Me) Cl] PF6, 5. Complex 2 was converted to H, T-[Ag-2(mu-C, P-(NCP)-C-Me)(2)](PF6)(2), 4, upon addition of base, while 6 gave [Au(kappa-C-(NCP)-C-Me)(2)]Cl, 8, when treated likewise. Reaction of [S-(NCHP)-C-Me]PF6 with Ni(1,5-COD)(2) gave the oxidative addition/insertion product [Ni(kappa(3)-N, C, P-(NCP)-C-Me)(eta(3)-C8H13)]PF6, 9, which converted to [Ni(kappa(3)-N, C, P-(NCP)-C-Me)Cl)]PF6, 10, upon exposure of a CHCl3 solution to air. Complex 10 showed conformational isomerism that was also present in [Rh(kappa(3)-N, C, P-(NCP)-C-Me)(CO)]PF6, 14, prepared from the precursor complex [Rh(kappa-P-(NCHP)-C-Me)(acac)(CO)]PF6, 13, upon heating in C6H5Cl. [Pt(kappa(3)-N, C, P-(NCP)-C-Me)(Cl)] PF6, 12, derived from trans-[Pt(kappa-P-(NCHP)-C-Me)(2)(Cl)(2)](PF6)(2), 11, was isolated as a single conformer.
机译:合成了一个不对称异位配体(S-(NCP)-C-Me),其中含有一个带有一个吡啶基和一个膦外取代基的中心双环,扩环NHC,并研究了其与选定的后期过渡金属的配位化学。 idi前体[S-(NCHP)-C-Me] PF6显示出取决于L:M比率的具有Ag(I),Cu(I)和Au(I)的可变配位模式。两摩尔[S-(NCHP)-C-Me] PF6与[Cu(MeCN)(4)] BF4,AgBF4或Au(THT)Cl的反应得到双配体络合物[Cu(kappa-P- (NCHP)-C-Me)(2)(CH3CN)(2)] BF4,中心点(PF6)(2),1和[M(kappa-P-(NCHP)-C-Me)(2) ] X中心点(PF6)(2)(3:M = Ag,X = BF4; 6:M = Au,X = Cl)。 [S-(NCHP)-C-Me] PF6与AgOTf的1:1反应产生了从头到尾的二聚体H,T- [Ag-2(mu-N,P-(NCHP)-C-Me )(2)(mu-OTf)(2)](PF6)(2),2,而与Au(THT)Cl的类似反应得到单体[Au(kappa-P-(NCHP)-C-Me)Cl ] PF6,5。在添加碱的情况下,将配合物2转化为H,T- [Ag-2(mu-C,P-(NCP)-C-Me)(2)](PF6)(2),4, ,而6同样得到[Au(kappa-C-(NCP)-C-Me)(2)] Cl,8。 [S-(NCHP)-C-Me] PF6与Ni(1,5-COD)(2)的反应生成氧化加成/插入产物[Ni(kappa(3)-N,C,P-(NCP) -C-Me)(eta(3)-C8H13)] PF6,9,它转换为[Ni(kappa(3)-N,C,P-(NCP)-C-Me)Cl)] PF6,10,将氯仿溶液暴露在空气中。配合物10显示出构象异构现象,该构象异构体也存在于[Rh(kappa(3)-N,C,P-(NCP)-C-Me)(CO)] PF6,14中。在C6H5Cl中加热后,P-(NCHP)-C-Me)(acac)(CO)] PF6、13。 [Pt(kappa(3)-N,C,P-(NCP)-C-Me)(Cl)] PF6,12,源自反式-[Pt(kappa-P-(NCHP)-C-Me)( 2)(Cl)(2)](PF6)(2),11被分离为单个构象异构体。

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