Rigid Bis(tetrathiafulvalenes) Doubly Bridged by Phosphino Groups and Derivatives: Synthesis and Intramolecular Mixed Valence State

摘要

Bis(phosphine sulfide) and bimetallic metal?carbonyl complexes of the rigid bis(TTF) (PPh)2(o-DMTTF)2 are synthesized and structurally characterized. UV?visible and EPR spectroelectrochemistry combined with theoretical calculations demonstrate undoubtedly the occurrence and isolation of a mixed valence state in the radical cation of (PPh)2(o-DMTTF)2, with full delocalization of the radical on the two redox sites.