Heterocyclic compounds for use in electronic devices

A compound comprising structures of the formula (I)

• wherein:
• X is the same or different at each instance and is N or CR1, preferably CR1, with the proviso that not more than two of the X groups in one cycle are N;
• Z is a bond, C(R1)2, O or S;
• L1 is a bond, an aromatic ring system having 6 to 60 carbon atoms or a heteroaromatic ring system having 3 to 60 carbon atoms, each of which may be substituted by one or more R1 radicals;
• Ar1, Ar2, Ar3 is an aryl group having 6 to 40 carbon atoms or a heteroaryl group having 3 to 40 carbon atoms, each of which may be substituted by one or more R1 radicals;
• R1 is the same or different at each instance and is H, D, F, Cl, Br, I, B(OR2)2, CHO, C(═O)R2, CR2═C(R2)2, CN, C(═O)OR2, C(═O)N(R2)2, Si(R2)3, N(R2)2, NO2, P(═O)(R2)2, OSO2R2, OR2, S(═O)R2, S(═O)2R2, a straight-chain alkyl, alkoxy or thioalkoxy group having 1 to 40 carbon atoms or a branched or cyclic alkyl, alkoxy or thioalkoxy group having 3 to 40 carbon atoms, each of which may be substituted by one or more R2 radicals, where one or more nonadjacent CH2 groups may be replaced by —R2C═CR2—, —C≡C—, Si(R2)2, C═O, C═S, C═NR2, —C(═O)O—, —C(═O)NR2—, NR2, P(═O)(R2), —O—, —S—, SO or SO2 and where one or more hydrogen atoms may be replaced by D, F, Cl, Br, I, CN or NO2, or an aromatic or heteroaromatic ring system which has 5 to 40 aromatic ring atoms and may be substituted in each case by one or more R2 radicals, or an aryloxy or heteroaryloxy group which has 5 to 40 aromatic ring atoms and may be substituted by one or more R2 radicals, or a combination of these systems;
• at the same time, two or more adjacent R1 substituents together may also form a mono- or polycyclic, aliphatic or aromatic ring system;
• R2 is the same or different at each instance and is H, D, F, Cl, Br, I, B(OR3)2, CHO, C(═O)R3, CR3═C(R3)2, CN, C(═O)OR3, C(═O)N(R3)2, Si(R3)3, N(R3)2, NO2, P(═O)(R3)2, OSO2R3, OR3, S(═O)R3, S(═O)2R3, a straight-chain alkyl, alkoxy or thioalkoxy group having 1 to 40 carbon atoms or a branched or cyclic alkyl, alkoxy or thioalkoxy group having 3 to 40 carbon atoms, each of which may be substituted by one or more R3 radicals, where one or more nonadjacent CH2 groups may be replaced by —R3C═CR3—, —C≡C—, Si(R3)2, C═O, C═S, C═NR3, —C(═O)O—, —C(═O)NR3—, NR3, P(═O)(R3), —O—, —S—, SO or SO2 and where one or more hydrogen atoms may be replaced by D, F, Cl, Br, I, CN or NO2, or an aromatic or heteroaromatic ring system which has 5 to 40 aromatic ring atoms and may be substituted in each case by one or more R3 radicals, or an aryloxy or heteroaryloxy group which has 5 to 40 aromatic ring atoms and may be substituted by one or more R3 radicals, or a combination of these systems;
• at the same time, two or more adjacent R2 substituents together may also form a mono- or polycyclic, aliphatic or aromatic ring system;
• R3 is the same or different at each instance and is H, D, F or an aliphatic, aromatic and/or heteroaromatic hydrocarbyl radical having 1 to 20 carbon atoms, in which hydrogen atoms may also be replaced by F;
• at the same time, two or more adjacent R3 substituents together may also form a mono- or polycyclic, aliphatic or aromatic ring system;
• with the proviso that
• at least one of the Ar2 and/or Ar3 radicals is a group of the formula (IIa) or (IIb)
• in which
• X is the same or different at each instance and is N or CR1, preferably CR1, with the proviso that not more than two of the X groups in one cycle are N;
• L2 is a bond, an aromatic ring system having 6 to 60 carbon atoms or a heteroaromatic ring system having 3 to 60 carbon atoms, each of which may be substituted by one or more R1 radicals;
• R1 is as defined above and the dotted line represents the bonding site, such that L2 binds to the same nitrogen atom as L1.