From neutral iminophosphoranes to multianionic phosphazenates. The coordination chemistry of imino-zaz-P(V) ligands

摘要

This review deals with the chemistry and coordination behaviour of imino-aza phosphorus (V) lignads focussing on s-and p- block as well as Group 11 and 12 metal complexes. Imino phosphorus (V) ligands contain one or more terminal R-N=P-units, which include iminophosphoranes R_3PNR', monoanionic diiminophosphinates [R_2P(NR')_2]~-, dianionic triiminophosphonates [RP(NR)_3]~2- and trianionic tetraiminophosphates [P(NR')_4]~3-. Aza-phosphorus (V) lignads feature bridging P-N=P units, which inlcude cyclic and polymeric phosphazenes [R_2PN]_n.