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随着有机金属化学的发展,人们对鑭系元素的有机金属化合物表现出越来越大的兴趣。七十年代以来这一领域已取得很大进展。相继合成了包含金属-碳囵π键及金属-碳σ键的许多有机金属化合物,其中对包含环戊二烯基的一类鑭系有机金属化合物的合成和性质研究尤为活跃。文献上对这类化合物的~(13)C核磁共振的实验研究只有过为数不多的一些报道,而用量子力学近似方法对鑭系配合物的~(13)C核磁共振化学位移进行计算则尚未见报道。本文在这一方面以1,1′-三亚甲基双环戊二烯基-特丁基鑭四氢呋喃配合物为对象进行一些尝试性探讨。
With the development of organometallic chemistry, there is an increasing interest in organometallic compounds of lanthanides. Much progress has been made in this area since the 1970s. Many organometallics containing metal-carbonium π bond and metal-carbon σ bond have been synthesized one after another, among which the synthesis and properties of a class of lanthanide organometallic compounds containing cyclopentadienyl groups are particularly active. Literature on the ~ (13) C NMR study of these compounds only a few reports, and quantum mechanics approximation of the lanthanide complex ~ (13) C NMR chemical shifts are calculated Not yet reported. This article in this regard to 1,1’-trimethylene biscyclopentadienyl-tert-butyl lanthanum tetrahydrofuran complexes for some tentative discussion.