School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland, 4072, Australia.
Angew Chem Int Ed Engl. 2020 May 25;59(22):8332-8342. doi: 10.1002/anie.201913840. Epub 2020 Mar 19.
Zeise's salt, KPt(C H )Cl , was the first characterized organometallic compound; it was also the first olefin π-complex. It was published in 1825-1830 in the middle of a fight between Dumas on the one hand and Berzelius and Liebig on the other, who defended the etherin (ethylene) and radical theories, respectively. Although Zeise's formulation as a compound containing ethylene was vindicated, the fight went on for many years. This was a time when the theories of organic chemistry were being developed, before any clear understanding of the nature of molecules, bonding, and structure. Zeise thought of the structure of his salt as a product of the addition of PtCl to ethylene. Jensen assumed a central bonding to ethylene but needed theoretical assistance to explain it. His attempt to obtain such an explanation from Hückel failed, and it was Dewar who explained the nature of π-complexes in molecular orbital terms in 1951.
蔡斯盐，KPt(C H )Cl ，是第一个被描述的有机金属化合物；它也是第一个烯烃π-配合物。它于 1825 年至 1830 年间发表，正值杜马（Dumas）与贝采里乌斯（Berzelius）和李比希（Liebig）之间的一场争论的中间，后者分别捍卫了乙醚（乙烯）和自由基理论。尽管蔡斯（Zeise）将其表述为含有乙烯的化合物的配方得到了证实，但这场争论仍持续了多年。这是有机化学理论发展的时期，在分子、键和结构的性质有任何明确认识之前。蔡斯（Zeise）认为他的盐的结构是 PtCl 与乙烯加成的产物。延森（Jensen）假设了与乙烯的中心键合，但需要理论上的帮助来解释它。他试图从休克尔（Hückel）那里获得这种解释，但失败了，而德瓦尔（Dewar）在 1951 年用分子轨道理论解释了π-配合物的性质。
