Conjugated Polymers Featuring Heavier Main Group Element Multiple Bonds:  A Diphosphene-PPV

A new sterically encumbered bifunctional ligand has been developed, and its ability to provide simultaneous stabilization for two low-coordinate phosphorus centers has allowed the synthesis of new hybrid inorganic−organic conjugated materials. The new phosphaalkene polymers have been prepared from a diphospha-Wittig reagent and are exclusively E-configured about the PC bonds. An unprecedented polymer having diphosphene (−PP−) units in the polymer main chain is also reported. The soluble polymers were characterized by UV−visible and fluorescence spectroscopy, as well as by ¹H and ³¹P NMR spectroscopy.