Metal−Metal Bonding in Sterically Frustrated Dipalladium Species
摘要:
Stoichiometric-deficient lithiation of (2,6-diisopropylphenyl)(4-methylpyridin-2-yl)amine and reaction with [(cod)PdCl2] (cod = 1,5-cyclooctadiene) yield a dimeric Pd complex. X-ray structural analysis of this complex reveals a very short Pd-Pd distance (2.429 angstrom). Topological analysis of the electron density and the electron localization function from scalar relativistic density functional theory calculations clearly indicate a Pd(I)-Pd(I) sigma-bonding interaction, for which the corresponding occupied localized orbital can be identified.
An overview over the binding situation in transition metal and lanthanide aminopyridinatocomplexes is given. Trueaminopyridinatocomplexes in which we observe a significant longer N-amido than N-pyridine bond length are rare and for instance observed for ruthenium. Additional examples of ruthenium aminopyridinatocomplexes were synthesized and characterized by X-ray crystal structure analysis.
概述了过渡金属和镧系元素氨基吡啶配合物的结合情况。真正的氨基吡啶络合物,其中我们观察到明显长于 N-吡啶键长的 N-酰胺基是罕见的,例如观察到的钌。合成了氨基吡啶配合物的其他例子,并通过 X 射线晶体结构分析对其进行了表征。