Loh Ying Kai, Ying Lu, Ángeles Fuentes M, Do Dinh Cao Huan, Aldridge Simon
Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford, OX1 3QR, UK.
Angew Chem Int Ed Engl. 2019 Apr 1;58(15):4847-4851. doi: 10.1002/anie.201812058. Epub 2019 Feb 14.
Introduced here is a new type of strongly donating N-heterocyclic boryloxy (NHBO) ligand, [(HCDippN) BO] (Dipp=2,6-diisopropylphenyl), which is isoelectronic with the well-known N-heterocyclic iminato (NHI) donor class. This 1,3,2-diazaborole functionalized oxy ligand has been used to stabilize the first acyclic two-coordinate dioxysilylene and its Ge, Sn, and Pb congeners, thereby presenting the first complete series of heavier group 14 dioxycarbene analogues. All four compounds have been characterized by X-ray crystallography and density-functional theory, enabling analysis of periodic trends: the potential for the [(HCDippN) BO] ligand to subtly vary its electronic-donor capabilities is revealed by snapshots showing the gradual evolution of arene π coordination on going from Si to Pb.
本文介绍了一种新型的强供电子N-杂环硼氧基（NHBO）配体[(HCDippN)BO]（Dipp = 2,6-二异丙基苯基），它与著名的N-杂环亚氨基（NHI）供体类别等电子。这种1,3,2-二氮杂硼烷官能化的氧配体已被用于稳定首个无环二配位二氧硅烯及其锗、锡和铅同系物，从而呈现出首个完整系列的较重第14族二氧卡宾类似物。所有四种化合物均已通过X射线晶体学和密度泛函理论进行了表征，从而能够分析周期趋势：通过展示从硅到铅时芳烃π配位逐渐演变的快照，揭示了[(HCDippN)BO]配体微妙改变其电子供体能力的潜力。
