Boronic heterocyclic compounds for organic electroluminescent devices

A compound including at least one structure of the formula (I)

• where the further symbols used are as follows:
• Za, Zb is the same or different at each instance and is N, CR, or the Za, Zb groups form a ring Ara, where the ring Ara is the same or different at each instance and is an aromatic or heteroaromatic ring system which has 5 to 60 aromatic ring atoms and may be substituted by one or more Ar or Ra radicals, where the ring Ara together with the CO group and the Wa, Wb groups forms a 5-membered ring;
• Wa, Wb is the same or different at each instance and is NR, NAr, NB(R)2 or NB(Ar)2, where exactly one of the Wa, Wb groups is NB(R)2, NB(Ar)2, and exactly one of the Wa, Wb groups is NR, NAr, or the Wa, Wb groups form a ring of the formula
• where Zc is R or Ar, the ring Arb is the same or different at each instance and is an aromatic or heteroaromatic ring system which has 5 to 60 aromatic ring atoms and may be substituted by one or more Ar or Rb radicals, where the ring Arb may form a ring system with an R, Ar or Zc group or the rings Ara and Arb together may form a ring system, and the dotted lines represent the bonds to the CO group or Zb group;
• Ar is the same or different at each instance and is an aromatic or heteroaromatic ring system which has 5 to 60 aromatic ring atoms and may be substituted by one or more R radicals;
• the Ar group here may form a ring system with at least one Ar, R, Ra, Rb group or a further group;
• R, Ra, Rb is the same or different at each instance and is H, D, OH, F, Cl, Br, I, CN, NO2, N(Ar′)2, N(R1)2, C(═O)N(Ar′)2, C(═O)N(R1)2, C(Ar′)3, C(R1)3, Si(Ar′)3, Si(R1)3, B(Ar′)2, B(R1)2, C(═O)Ar′, C(═O)R1, P(═O)(Ar′)2, P(═O)(R1)2, P(Ar′)2, P(R1)2, S(═O)Ar′, S(═O)R1, S(═O)2Ar′, S(═O)2R1, OSO2Ar′, OSO2R1, a straight-chain alkyl, alkoxy or thioalkoxy group having 1 to 40 carbon atoms or an alkenyl or alkynyl group having 2 to 40 carbon atoms or a branched or cyclic alkyl, alkoxy or thioalkoxy group having 3 to 20 carbon atoms, where the alkyl, alkoxy, thioalkoxy, alkenyl or alkynyl group may in each case be substituted by one or more R1 radicals, where one or more nonadjacent CH2 groups may be replaced by R1C═CR1, C≡C, Si(R1)2, C═O, C═S, C═Se, C═NR1, —C(═O)O—, —C(═O)NR1—, NR1, P(═O)(R1), —O—, —S—, SO or SO2, or an aromatic or heteroaromatic ring system which has 5 to 60 aromatic ring atoms and may be substituted in each case by one or more R1 radicals, or an aryloxy or heteroaryloxy group which has 5 to 60 aromatic ring atoms and may be substituted by one or more R1 radicals;
• or heteroarylthio group which has 5 to 60 aromatic ring atoms and may be substituted by one or more R1 radicals, or a diarylamino, arylheteroarylamino, diheteroarylamino group which has 5 to 60 aromatic ring atoms and may be substituted by one or more R1 radicals, or an aralkyl or heteroarylalkyl group which has 5 to 60 aromatic ring atoms and 1 to 10 carbon atoms in the alkyl radical and may be substituted by one or more R1 radicals;
• at the same time, two R, Ra, Rb radicals together or with a further group may also form a ring system;
• Ar′ is the same or different at each instance and is an aromatic or heteroaromatic ring system which has 5 to 60 aromatic ring atoms and may be substituted by one or more R1 radicals;
• at the same time, it is possible for two Ar′ radicals bonded to the same carbon atom, silicon atom, nitrogen atom, phosphorus atom or boron atom also to be joined together via a bridge by a single bond or a bridge selected from B(R1), C(R1)2, Si(R1)2, C═O, C═NR1, C═C(R1)2, O, S, S═O, SO2, N(R1), P(R1) and P(═O)R1;
• R1 is the same or different at each instance and is H, D, F, Cl, Br, I, CN, NO2, N(Ar″)2, N(R2)2, C(═O)Ar″, C(═O)R2, P(═O)(Ar″)2, P(Ar″)2, B(Ar″)2, B(R2)2, C(Ar″)3, C(R2)3, Si(Ar″)3, Si(R2)3, 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 or an alkenyl group having 2 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═Se, 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 60 aromatic ring atoms, each of which may be substituted by one or more R2 radicals, or an aryloxy or heteroaryloxy group which has 5 to 60 aromatic ring atoms and may be substituted by one or more R2 radicals, or an aralkyl or heteroaralkyl group which has 5 to 60 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 R1 radicals together may form a ring system;
• at the same time, one or more R1 radicals may form a ring system with a further part of the compound;
• Ar″ is the same or different at each instance and is an aromatic or heteroaromatic ring system which has 5 to 30 aromatic ring atoms and may be substituted by one or more R2 radicals;
• at the same time, it is possible for two Ar″ radicals bonded to the same carbon atom, silicon atom, nitrogen atom, phosphorus atom or boron atom also to be joined together via a bridge by a single bond or a bridge selected from B(R2), C(R2)2, Si(R2)2, C═O, C═NR2, C═C(R2)2, O, S, S═O, SO2, N(R2), P(R2) and P(═O)R2;
• R2 is the same or different at each instance and is selected from the group consisting of H, D, F, CN, an aliphatic hydrocarbyl radical having 1 to 20 carbon atoms or an aromatic or heteroaromatic ring system which has 5 to 30 aromatic ring atoms and in which one or more hydrogen atoms may be replaced by D, F, Cl, Br, I or CN and which may be substituted by one or more alkyl groups each having 1 to 4 carbon atoms;
• at the same time, two or more substituents R2 together may form a ring system.