Rhodium and Iridium Complexes Bearing “Capping Arene” Ligands: Synthesis and Characterization

Rhodium and Iridium Complexes Bearing “Capping Arene” Ligands: Synthesis and Characterization
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带有“封端芳烃”配体的铑和铱配合物:合成和表征

DOI:
10.1021/acs.organomet.1c00250
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发表时间:
2021
期刊:
影响因子:
2.8
通讯作者:
Gunnoe, T. Brent
Gunnoe, T. Brent
中科院分区:
化学2区
文献类型:
--
作者:
Gu, Shunyan;Musgrave, Charles B.;Gehman, Zoë M.;Zhang, Ke;Dickie, Diane A.;Goddard, William A.;Gunnoe, T. Brent

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一系列含“封端芳烃”配体的烯烃配位铑和铱配合物通式(FP)M(烯烃)X、[(FP)M(烯烃)2][M(烯烃)2X2]和[(FP)M(烯烃)2] BF 4的(5-XFP和6-XFP,参见下文)(FP =“封端芳烃”配体,X =卤化物或拟卤化物,烯烃=乙烯,环辛烯,(烯烃)2=(C2 H4)2或环辛烯)进行了合成和表征。单晶X-射线衍射研究表明,结构上的差异是一个功能的身份封端芳烃配体和金属。对于5-XFP配体(5-XFP = 1,2-双(N-7-氮杂吲哚基)-苯和在芳烃部分上具有取代基的衍生物),与Rh和Ir的配位产生最佳描述为16电子和正方形平面的络合物。对于6-XFP配体(6-XFP = 8,8 ′-(1,2-亚苯基)二喹啉及其衍生物),由于金属中心与封端芳烃配体的芳烃基团之间的η2-C,C相互作用,Rh和Ir配合物的结构更好地被认为是18电子三角双锥。乙烯旋转的变温1H NMR光谱研究表明,与Rh配合物相比,Ir配合物具有更高的旋转活化能垒,并且对于(FP)Rh(η2-C2 H4)Cl类型的配合物,与5-XFP配合物相比,6-XFP配合物倾向于给予乙烯更高的旋转能垒。与5-XFP配体相比,DFT计算与由6-XFP配体连接的Rh络合物的Rh向乙烯π-反馈增强一致。
A series of olefin-coordinated RhIand IrIcomplexes bearing “capping arene” ligands (5-XFP and 6-XFP, see below) of the general formulas (FP)M(olefin)X, [(FP)M(olefin)2][M(olefin)2X2], and [(FP)M(olefin)2]BF4(FP = “capping arene” ligands, X = halide or pseudohalide, olefin = ethylene, cyclooctene, (olefin)2= (C2H4)2or cyclooctadiene) were synthesized and characterized. Single-crystal X-ray diffraction studies revealed structural differences that are a function of the identity of the capping arene ligand and the metal. For 5-XFP ligands (5-XFP = 1,2-bis(N-7-azaindolyl)-benzene and derivatives with substituents on the arene moiety), the coordination to both Rh and Ir gives rise to complexes that are best described as 16-electron and square planar. For 6-XFP ligands (6-XFP = 8,8′-(1,2-phenylene)diquinoline and derivatives with substituents on the arene moiety), the structures of Rh and Ir complexes are better considered as 18-electron and trigonal bipyramidal due to an η2-C,Cinteraction between the metal center and the arene group of the capping arene ligand. Variable-temperature1H NMR spectroscopy studies of ethylene rotation demonstrated that the Ir complexes possess higher activation barriers to rotation in comparison to Rh complexes and the 6-XFP complexes tend to give ethylene higher rotational barriers in comparison to 5-XFP complexes for complexes of the type (FP)Rh(η2-C2H4)Cl. DFT calculations are consistent with enhanced Rh to ethylene π-back-donation for Rh complexes ligated by the 6-XFP ligands in comparison to the 5-XFP ligands.
Christoph Elschenbroich,Wiley-VCH,2006 年,第 3 版,818 页 ISBN 3-527-29390-6(平装本)
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发表时间: 2006
影响因子: 3.9
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期刊: Journal of The Chemical Society A: Inorganic, Physical, Theoretical
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