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首页> 外文期刊>Chemistry: A European journal >Dimeric Palladium Complexes with Bridging Aryl Groups:When are they Stable?
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Dimeric Palladium Complexes with Bridging Aryl Groups:When are they Stable?

机译：具有桥联芳基的二聚钯配合物：何时稳定？

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摘要

Stable dimeric palladium(n)complexes of general formula[Pd2(n-R)_2(rf-allyl)_2](R = haloaryl,mesityl)have been prepared.Their X-ray crystal structures,determined for some of the complexes,show that the two coordination square planes are usually co-planar.The haloaryl complexes are fluxional in solution,showing exchange between cis and trans isomers(relative to the orientation of the two allyl groups in the dimer)through solvent-assisted associative bridge splitting.A number of other ancillary ligands(O,O,S,S,or C,N donors)failed to stabilize the bridging situation.Also,bridging phenyls were unstable.The reasons for this behavior and the formation of alternative compounds in attempts at synthesizing them are fully analyzed and explained.Stable aryl bridges seem to be favored by a combination of factors:the use of ancillary ligands of small size and lacking electron lone pairs,and the use of aryl ligands reluctant to homo and hetero C-C coupling.These seem to be more important factors in the stabilization of bridging aryl complexes than the strength of the bridges themselves.
机译：制备了稳定的通式为[Pd2（nR）_2（rf-烯丙基）_2]（R =卤代芳基，甲磺酰基）的二聚钯（n）配合物。他们的X射线晶体结构已为某些配合物确定，表明卤代芳基络合物在溶液中呈流动状态，显示顺式和反式异构体之间的交换（相对于二烯基中两个烯丙基的取向）是通过溶剂辅助缔合桥拆分而形成的。的其他辅助配体（O，O，S，S或C，N供体）未能稳定桥联态势。此外，桥联苯基不稳定。造成这种现象的原因以及试图合成它们的替代化合物的形成是稳定的芳基桥似乎受到多种因素的青睐：使用小尺寸且缺乏电子孤对的辅助配体，以及不愿进行均相和杂合CC偶合的芳基配体。更重要的因素桥联芳基配合物的稳定性比桥本身的强度高。

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