PII Compounds. Electrical Properties and Structure of Phospha-alkenes and Phospha-azenes

Abstract

Chemistry of twocoordinated phosphorus compounds has been rapidly developed in last years. Parallel with synthesis of new such compounds and investigating of their chemistry research of their spatial and electron structure assumes ever greater importanse. Electrical methods are very informative in this aspect and also permit to determine unknown polaritirs of P^II-bonds, that have great self-dependent interest. We have been studed for the first time the acyclic P^II-compounds containing P=N, P=C, P=P, P=As, P=Sb - double bonds. Phosphaazenes R^IP=NR², where R^I: (Me₃Si)₂N, 2,4,6-^tBu₃C₆H₂; R²: Me₃Si, ^tBu, 2,4,6-^tBu₃C₆H₂ have small polarity 1.5–2.0 D, wich describes by one set of parameteres. The main role in stabilization of -P=N-fragment having E-configuration belongs to sterical factors.