Spirobifluorene derivative-based materials for electronic devices

A compound of the formula (I)

• which may be substituted at one or more positions shown as unsubstituted in the base structure of formula (I) by one R1 radical each;
• and
• which has the following definitions of the variables:
• Y is selected from a single bond, O, S and Se;
• Z is selected from O, S and Se;
• E is the same or different at each instance and is a single bond or an aromatic or heteroaromatic ring system which has 6 to 30 aromatic ring atoms and may be substituted by one or more R2 radicals;
• A is the same or different at each instance and is a group of the formula (A1), (A2) or (A3) which is bonded via the bond marked with #;
• Ar2 is the same or different at each instance and is an aromatic or heteroaromatic ring system which has 6 to 30 aromatic ring atoms and may be substituted by one or more R2 radicals;
• X is the same or different at each instance and is a single bond or a group selected from BR2, C(R2)2, Si(R2)2, C═O, O, S, S═O, SO2, NR2, PR2 and P(═O)R2;
• R1 is the same or different at each instance and is selected from H, D, F, C(═O)R3, CN, Si(R3)3, P(═O)(R3)2, OR3, S(═O)R3, S(═O)2R3, straight-chain alkyl or alkoxy groups having 1 to 20 carbon atoms, branched or cyclic alkyl or alkoxy groups having 3 to 20 carbon atoms, alkenyl or alkynyl groups having 2 to 20 carbon atoms, aromatic ring systems having 6 to 40 aromatic ring atoms, and heteroaromatic ring systems having 5 to 40 aromatic ring atoms;
• where two or more R1 radicals may be joined to one another and may form a ring;
• where the alkyl, alkoxy, alkenyl and alkynyl groups mentioned and the aromatic ring systems and heteroaromatic ring systems mentioned may each be substituted by one or more R3 radicals;
• and where one or more CH2 groups in the alkyl, alkoxy, alkenyl and alkynyl groups mentioned may be replaced by —R3C═CR3—, —C═C—, Si(R3)2, C═O, C═NR3, —C(═O)O—, —C(═O)NR3—, NR3, P(═O)(R3), —O—, —S—, SO or SO2;
• R2 is the same or different at each instance and is selected from H, D, F, C(═O)R3, CN, Si(R3)3, N(R3)2, P(═O)(R3)2, OR3, S(═O)R3, S(═O)2R3, straight-chain alkyl or alkoxy groups having 1 to 20 carbon atoms, branched or cyclic alkyl or alkoxy groups having 3 to 20 carbon atoms, alkenyl or alkynyl groups having 2 to 20 carbon atoms, aromatic ring systems having 6 to 40 aromatic ring atoms, and heteroaromatic ring systems having 5 to 40 aromatic ring atoms;
• where two or more R2 radicals may be joined to one another and may form a ring;
• where the alkyl, alkoxy, alkenyl and alkynyl groups mentioned and the aromatic ring systems and heteroaromatic ring systems mentioned may each be substituted by one or more R3 radicals;
• and where one or more CH2 groups in the alkyl, alkoxy, alkenyl and alkynyl groups mentioned may be replaced by —R3C═CR3—, —C═C—, Si(R3)2, C═O, C═NR3, —C(═O)O—, —C(═O)NR3—, NR3, P(═O)(R3), —O—, —S—, SO or SO2;
• R3 is the same or different at each instance and is selected from H, D, F, C(═O)R4, CN, Si(R4)3, N(R4)2, P(═O)(R4)2, OR4, S(═O)R4, S(═O)2R4, straight-chain alkyl or alkoxy groups having 1 to 20 carbon atoms, branched or cyclic alkyl or alkoxy groups having 3 to 20 carbon atoms, alkenyl or alkynyl groups having 2 to 20 carbon atoms, aromatic ring systems having 6 to 40 aromatic ring atoms, and heteroaromatic ring systems having 5 to 40 aromatic ring atoms;
• where two or more R1 or R2 radicals may be joined to one another and may form a ring;
• where the alkyl, alkoxy, alkenyl and alkynyl groups mentioned and the aromatic ring systems and heteroaromatic ring systems mentioned may each be substituted by one or more R4 radicals;
• and where one or more CH2 groups in the alkyl, alkoxy, alkenyl and alkynyl groups mentioned may be replaced by —R4C═CR4—, —C═C—, Si(R4)2, C═O, C═NR4, —C(═O)O—, —C(═O)NR4—, NR4, P(═O)(R4), —O—, —S—, SO or SO2;
• R4 is the same or different at each instance and is selected from H, D, F, CN, alkyl groups having 1 to 20 carbon atoms, aromatic ring systems having 6 to 40 aromatic ring atoms and heteroaromatic ring systems having 5 to 40 aromatic ring atoms;
• where two or more R4 radicals may be joined to one another and may form a ring;
• and where the alkyl groups, aromatic ring systems and heteroaromatic ring systems mentioned may be substituted by F or CN;
• q is the same or different at each instance and is 0 or 1, where at least one q in formula (A2) is 1;
• a, b, c, and d are the same or different at each instance and are 0 or 1, where at least one of the indices a, b, c and d is 1, and where, in the case that one or more of the indices a, b, c and d are 0, an R1 group is attached at the position in question.