Abstract
The introduction of phosphorusโcontaining moieties into ฯโconjugated thiophene materials has been found to provide materials with strongly optimized and highly tunable optoelectronic features compared to their native thiophene counterparts. 2,5โDiarylโ and 2,5โbis(heteroaryl)phospholes as well as fused tricyclic dithieno[3,2โb:2โฒ,3โฒโd]phospholes represent two very valuable building blocks for organic electronics as their intriguing features can be altered systematically by several, in part unique, methodologies. The potential scope of these modifications has been determined by comprehensive investigations of their structureโproperty relationships via suitable molecular model compounds. Onseveral occasions, these observations could successfully be transposed to corresponding polymers that are often difficult to characterize independently. The same is true for the first organic lightโemitting diodes (OLEDs) based on a phosphole scaffold, whose properties could also be predicted successfully. (ยฉ WileyโVCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)