Polymers comprising substituted anthracenyl units, blends comprising these polymers, and devices comprising these polymers or blends

A polymer comprising at least one structural unit of the general formula (I)

• where the following applies to the symbols and indices used:
• Ar is an aryl, aryloxy, heteroaryl or heteroaryloxy group or an aromatic or heteroaromatic ring system,
• R1 and R2 are each, independently of one another, Ar1, H, D, F, Cl, Br, I, N(Ar2)2, C(═O)Ar2, P(═O)Ar22, S(═O)Ar2, S(═O)2Ar2, CR3═CR3Ar2, CN, NO2, Si(R3)3, B(OR3)2, OSO2R3, a straight-chain alkyl, alkoxy or thioalkoxy group having 1 to 40 C atoms or a branched or cyclic alkyl, alkoxy or thioalkoxy group having 3 to 40 C atoms, each of which optionally is substituted by one or more radicals R3, where one or more non-adjacent CH2 groups optionally is replaced by R3C═CR3, C≡C, Si(R3)2, Ge(R3)2, Sn(R3)2, C═O, C═S, C═Se, C═NR3, P(═O)(R3), SO, SO2, NR3, O, S or CONR3 and where one or more H atoms optionally is replaced by F, Cl, Br, I, CN or NO2,
• Ar1 is selected on each occurrence, in each case independently of one another, from an aryl or heteroaryl group or an aromatic or heteroaromatic ring system,
• Ar2 is an aryl, aryloxy, heteroaryl or heteroaryloxy group,
• R3 is in each case, independently of one another, H or an aliphatic or aromatic hydrocarbon radical having 1 to 20 C atoms,
• where furthermore, if R1 and R2 both denote a radical Ar1, the compound of the formula (I) is then selected from the structures of the formulae (Ia), (Ib), (Ic) and (Id):
• where Ar1 is on each occurrence identical or different, R4, R5, R6 and R7 each, independently of one another, have the meaning indicated for R1,
• where n≧1 and r=1,
• and where the bonds denoted by an asterisk represent the bonds to the adjacent structural units in the polymer.