Synthesis and Characterization of a Quasi-One-Coordinate Lead Cation

摘要

There has been intense,recent interest in the synthesis and properties of heavier Group-14-element (Si-Pb) analogues of carbocations.However,they have proven difficult to isolate in the absence of stabilization by further coordination of the Group 14 element.Many have been intramolecularly stabilized by solvation of the cationic center by either unsaturated moieties, or by N-,O-,S-,or P-centered Lewis base donors.Others have been inter-molecularly stabilized through coordination with various solvent molecules.Nonetheless,a number of groups have shown that essentially free,uncomplexed silicon,germanium,and tin species can be isolated and structurally characterized