首页> 外文期刊>Chemistry: A European journal >The Stereospecific Ligand Exchange at a Pseudo-Benzylic T-4 Iridium Centrein Planar-Chiral Cycloiridium (η~6-Arene)tricarbonylchromium Complexes
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The Stereospecific Ligand Exchange at a Pseudo-Benzylic T-4 Iridium Centrein Planar-Chiral Cycloiridium (η~6-Arene)tricarbonylchromium Complexes

机译:平面-手性环铱(η〜6-芳烃)三羰基铬配合物中伪苄基T-4铱中心的立体配体交换

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摘要

The stereospecificity ofligand exchange at the Ir~(III) centre of acycloiridium arenetricarbonylchromiumcomplex has been established experi-mentally by various analytical methodsas well as by X-ray diffraction structur-al analysis and computational investi-gations. Two new cases of phenyl andmethyl iridium(III) complexes havebeen prepared by reaction of (S_P~*,R_(Ir)~*)-chlorido{2-Rtricarbonyl)(η~6-phenylene-κC~1chromium KN}(pentamethylcyclopentadienyl)iridi-um(III) with PhMgBr and MeMgBr.The determining influence of electro-static repulsion has been established bymeans of density functional theory atthe Becke—Perdew/TZP(ZORA) levelby using, among other means, energy partitioning analysis. It is also shownthat the Cr(CO)_3fragment is likely toease the ionic cleavage of the Jr—Clbond in chlorido cycloiridium tricarbo-nylchromium complexes in a way simi-lar to that already established for thesolvolysis of benzyl halide complexes,that is, through a direct interaction ofthe Cr~0 centre with the cationic Ir~(III)centre.
机译:通过各种分析方法以及X射线衍射结构分析和计算研究,通过实验确定了在无环铱芳碳羰基铬配合物的Ir〜(III)中心的配体交换的立体特异性。通过(S_P〜*,R_(Ir)〜*)-氯{2-R三羰基)(η〜6-亚苯基-κC〜1铬KN}(五甲基环戊二烯基)的反应制备了两个新的苯基和甲基铱(III)配合物实例静电排斥的决定性影响是通过密度泛函理论在Becke-Perdew / TZP(ZORA)水平上通过能量分配分析等方法确定的。结果表明Cr(CO)_3片段可能以类似于已建立的用于溶剂化苄基卤化物的方法类似的方式,缓解了氯代环铱三碳-苯基铬络合物中Jr-Clbond的离子裂解。 Cr〜0以阳离子Ir〜(III)为中心。

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