Patent ID: 8048956

Claim:
A polyfluorene comprising at least one structural group of formula V wherein R 6 is a group of formula VI R 3 , R 4 and R 7 are independently hydrogen, alkyl, substituted alkyl, aryl substituted aryl, and combinations thereof; and R 11 and R 12 taken together form a substituted or unsubstituted monocyclic or bicyclic heteroaromatic ring; R 13 is independently at each occurrence halo, nitro, hydroxy, amino, alkyl, aryl, arylalkyl, alkoxy, substituted alkoxy, substituted alkyl, substituted aryl, or substituted arylalkyl; Ar is aryl, heteroaryl, substituted aryl, substituted heteroaryl, or a combination thereof; W is —X′—NH—Y′—, —X′—N═Y″—, —X″═N—Y′—, or a combination thereof; X′ is selected from a direct bond, alkylene, substituted alkylene, or combinations thereof; Y′ is alkylene, substituted alkylene, arylene, substituted arylene, oxaalkylene, substituted oxaalkylene, or a combination thereof; X″ is alkylidene, substituted alkylidene, or a combination thereof; Y″ is alkylidene, substituted alkylidene, arylidene, substituted arylidene, or a combination thereof, and p is 0, 1 or 2.