A Novel Type of Pentacoordinate Silicon Complexes and Unusual Ligand Coupling by Intramolecular Electron Transfer

摘要

There are only a few reports on intramolecular electron-transfer(ET)reactions in coordination compounds of the main-group elements.Some years ago,Arduengo et al.reported on the intriguing coordination properties of the electron-rich trianionic amido-bis(enolate)ligand [N{CH= C(tBu)O}_2]~(3-)(generated in situ from HN[CH_2C(O)tBu]_2(1)and a base),which can serve both as a tridentate NO_2 ligand and intramolecular two-electron reducing agent toward heavier Group 15 elements(P,As,Sb,Bi)owing to ligand-to-element ET.