Compounds for electronic devices

A compound of a formula (I)

• wherein A is, identically or differently on each occurrence, a group of the following formula (II) or (III)
• wherein the dashed line emanating from the nitrogen atom represents the bond from the group A to the central benzene ring;
• wherein the group HetAr including the nitrogen atom shown is, identically or differently on each occurrence, a heteroaryl group having 5 to 30 aromatic ring atoms, optionally substituted by one or more radicals R2;
• wherein the group Ar1 is, identically or differently on each occurrence, an aromatic or heteroaromatic ring system having 5 to 30 aromatic ring atoms, optionally substituted by one or more radicals R2, and wherein the two groups Ar1 may be connected via a group Y so that a ring is formed with the nitrogen atom of the group A, wherein
• Y is selected from a single bond, BR2, C(R2)2, Si(R2)2, NR2, PR2, P(═O)R2, P(═S)R2, O, S, S═O, and S(═O)2;
• and wherein furthermore:
• R1 is, identically or differently on each occurrence, 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, NO2, P(═O)(R3)2, OSO2R3, OR3, S(═O)R3, S(═O)2R3, a straight-chain alkyl, alkoxy or thioalkyl group having 1 to 20 C atoms, a branched or cyclic alkyl, alkoxy or thioalkyl group having 3 to 20 C atoms, or an alkenyl or alkynyl group having 2 to 20 C atoms, wherein the above-mentioned groups are optionally substituted by one or more radicals R3 and wherein one or more CH2 groups in the above-mentioned groups are optionally replaced by —R3C═CR3—, 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 wherein one or more H atoms in the above-mentioned groups are optionally replaced by D, F, Cl, Br, I, CN, or NO2, or an aromatic ring system having 6 to 60 aromatic ring atoms, optionally substituted by one or more radicals R3, or a heteroaromatic ring system having 5 to 60 aromatic ring atoms, which is not bonded via a ring nitrogen atom, and which is optionally substituted by one or more radicals R3, or an aryloxy or heteroaryloxy group having 5 to 60 aromatic ring atoms, optionally substituted by one or more radicals R3, or an aralkyl or heteroaralkyl group having 5 to 60 aromatic ring atoms, optionally substituted by one or more radicals R3;
• R2 is, identically or differently on each occurrence, 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 thioalkyl group having 1 to 20 C atoms, a branched or cyclic alkyl, alkoxy or thioalkyl group having 3 to 20 C atoms, or an alkenyl or alkynyl group having 2 to 20 C atoms, wherein the above-mentioned groups are optionally substituted by one or more radicals R3 and wherein one or more CH2 groups in the above-mentioned groups are optionally 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 wherein one or more H atoms in the above-mentioned groups are optionally replaced by D, F, Cl, Br, I, CN, or NO2, or an aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, optionally substituted by one or more radicals R3, or an aryloxy or heteroaryloxy group having 5 to 60 aromatic ring atoms, optionally substituted by one or more radicals R3, or an aralkyl or heteroaralkyl group having 5 to 60 aromatic ring atoms, optionally substituted by one or more radicals R3, wherein two or more radicals R2 are optionally linked to one another and optionally form a ring;
• R3 is, identically or differently on each occurrence, H, D, F, Cl, Br, I, B(OR4)2, CHO, C(═O)R4, CR4═C(R4)2, CN, C(═O)OR4, C(═O)N(R4)2, Si(R4)3, N(R4)2, NO2, P(═O)(R4)2, OSO2R4, OR4, S(═O)R4, S(═O)2R4, a straight-chain alkyl, alkoxy or thioalkyl group having 1 to 20 C atoms, or a branched or cyclic alkyl, alkoxy or thioalkyl group having 3 to 20 C atoms, or an alkenyl or alkynyl group having 2 to 20 C atoms, wherein the above-mentioned groups are optionally substituted by one or more radicals R4 and wherein one or more CH2 groups in the above-mentioned groups are optionally replaced by —R4C═CR4—, Si(R4)2, C═O, C═S, C═NR4, —C(═O)O—, —C(═O)NR4—, NR4, P(═O)(R4), —O—, —S—, SO, or SO2, and wherein one or more H atoms in the above-mentioned groups are optionally replaced by D, F, Cl, Br, I, CN, or NO2, or an aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, optionally substituted by one or more radicals R4, or an aryloxy or heteroaryloxy group having 5 to 60 aromatic ring atoms, optionally substituted by one or more radicals R4, or an aralkyl or heteroaralkyl group having 5 to 60 aromatic ring atoms, optionally substituted by one or more radicals R4, wherein two or more radicals R3 are optionally linked to one another and optionally form a ring;
• R4 is, identically or differently on each occurrence, H, D, F, or an aliphatic, aromatic or heteroaromatic organic radical having 1 to 20 C atoms, in which, in addition, one or more H atoms are optionally replaced by D or F;
• two or more substituents R4 are optionally linked to one another and optionally form a ring.