Cationic Low Oxidation State Phosphorus and Arsenic Compounds

摘要

Compounds containing main group elements in unusually low oxidation states exhibit structural features and reactivities that are significantly different from those of analogous compounds containing the elements in their more typical oxidation states. This work summarizes the investigations of cationic univalent group 15 compounds, with a particular focus on the research derived from the seminal work of Schmidpeter concerning P(I) cations. These unusually stable "triphosphenium" cations consist of a P+ center stabilized by two phosphine donors and have the general form [R3P-P-PR3]+. Recently, interest in this type of compound has been re-kindled because of the unique modes of reactivity they may display. Improved synthetic strategies to such compounds, and their arsenic analogues, have been developed and current research exploits the unique chemistry of Pn(I) cations to produce unprecedented chemicals and materials.