Materials for organic electroluminescent devices

A compound of the formula (1),

• where the following applies to the symbols and indices used:
• Ar1, ArN re on each occurrence, identically or differently, selected from an aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, which may in each case be substituted by one or more radicals R;
• E1 is on each occurrence, identically or differently, selected from —BR0—, —C(R0)2—, —C(R0)2—C(R0)2—, —C(R0)2—O—, —C(R0)2—S—, —R0C═CR0—, —R0C═N—, Si(R0)2, —Si(R0)2—Si(R0)2—, —C(═O)—, —C(═NR0)—, —C(═C(R0)2)—, —O—, —S—, —S(═O)—, —SO2—, —N(R0)—, —P(R0)— and —P((═O)R0)—;
• or E1 is a group of formula (E-1),
• where the symbol * in formula (E-1) indicates the corresponding group E1 in formula (1);
• and
• E0 is identically or differently on each occurrence, selected from the group consisting of a single bond, —BR0—, —C(R0)2—, —C(R0)2—C(R0)2—, —C(R0)2—O—, —C(R0)2—S—, —R0C═CR0—, —R0C═N—, Si(R0)2, —Si(R0)2—Si(R0)2—, —C(═O)—, —C(═NR0)—, —C(═C(R0)2)—, —O—, —S—, —S(═O)—, —SO2—, —N(R0)—, —P(R0)— and —P((═O)R0)—;
• E2 is, identically or differently, on each occurrence, selected from the group consisting of —O—, —S—, —S(═O)— and —SO2—;
• R0 to R5 stand on each occurrence, identically or differently, for H, D, F, Cl, Br, I, CHO, CN, N(Ar)2, C(═O)Ar, P(═O)(Ar)2, S(═O)Ar, S(═O)2Ar, NO2, Si(R)3, B(OR)2, OSO2R, a straight-chain alkyl, alkoxy or thioalkyl group having 1 to 40 C atoms or branched or cyclic alkyl, alkoxy or thioalkyl group having 3 to 40 C atoms, each of which may be substituted by one or more radicals R, where in each case one or more non-adjacent CH2 groups may be replaced by RC═CR, C≡C, Si(R)2, Ge(R)2, Sn(R)2, C═O, C═S, C═Se, P(═O)(R), SO, SO2, O, S or CONR and where one or more H atoms may be replaced by D, F, Cl, Br, I, CN or NO2, an aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, which may in each case be substituted by one or more radicals R, or an aryloxy group having 5 to 60 aromatic ring atoms, which may be substituted by one or more radicals R, where two adjacent substituents R0, and/or two adjacent substituents R1, and/or two adjacent substituents R2, and/or two adjacent substituents R3, and/or two adjacent substituents R4, and/or two adjacent substituents R5 may form a mono- or polycyclic, aliphatic ring system or aromatic ring system, which may be substituted by one or more radicals R;
• m stands on each occurrence, identically or differently, for an integer selected from 0, 1 or 2;
• n, q stand on each occurrence, identically or differently, for an integer selected from 0, 1, 2, 3 or 4;
• p stands on each occurrence, identically or differently, for an integer selected from 0, 1, 2 or 3;
• R stands on each occurrence, identically or differently, for H, D, F, Cl, Br, I, CHO, CN, N(Ar)2, C(═O)Ar, P(═O)(Ar)2, S(═O)Ar, S(═O)2Ar, NO2, Si(R′)3, B(OR′)2, OSO2R, a straight-chain alkyl, alkoxy or thioalkyl group having 1 to 40 C atoms or branched or cyclic alkyl, alkoxy or thioalkyl group having 3 to 40 C atoms, each of which may be substituted by one or more radicals R′, where in each case one or more non-adjacent CH2 groups may be replaced by R′C═CR′, C≡C, Si(R′)2, Ge(R′)2, Sn(R′)2, C═O, C═S, C═Se, P(═O)(R′), SO, SO2, O, S or CONR′ and where one or more H atoms may be replaced by D, F, Cl, Br, I, CN or NO2, an aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, which may in each case be substituted by one or more radicals R′, or an aryloxy group having 5 to 60 aromatic ring atoms, which may be substituted by one or more radicals R′, where two adjacent substituents R may form a mono- or polycyclic, aliphatic ring system or aromatic ring system, which may be substituted by one or more radicals R′;
• Ar is an aromatic or heteroaromatic ring system having 5 to 24 aromatic ring atoms, which may in each case also be substituted by one or more radicals R′;
• R′ stands on each occurrence, identically or differently, for H, D, F, Cl, Br, I, CN, a straight-chain alkyl, alkoxy or thioalkyl group having 1 to 20 C atoms or branched or cyclic alkyl, alkoxy or thioalkyl group having 3 to 20 C atoms, where in each case one or more non-adjacent CH2 groups may be replaced by SO, SO2, O, S and where one or more H atoms may be replaced by D, F, Cl, Br or I, or an aromatic or heteroaromatic ring system having 5 to 24 C atoms.