Materials for electronic devices

A compound of one of the following formulae:

• where:
• W is the same or different at each instance and is selected from O and S;
• Z is the same or different at each instance and is selected from CR1 and N;
• i is 0 or 1, where the Y group is absent when i=0;
• when i=0, Z1 is the same or different at each instance and is selected from CR1 and N;
• when i=1, Z1 is C;
• Y is the same or different at each instance and is selected from a bond, C(R1)2, O and S;
• ArL is the same or different at each instance and is selected from aromatic ring systems which have 6 to 40 aromatic ring atoms and are substituted by R2 radicals, and heteroaromatic ring systems which have 5 to 40 aromatic ring atoms and are substituted by R2 radicals;
• k is 0, 1, 2 or 3, where, when k=0, the Art group is absent and the two groups that bind to ArL in formula (I) and (II) are bonded directly to one another, where, when k=2, two ArL groups are bonded successively in a chain, and where, when k=3, three ArL groups are bonded successively in a chain;
• Ar1 is the same or different at each instance and is selected from aromatic ring systems which have 6 to 40 aromatic ring atoms and are substituted by R4 radicals, and heteroaromatic ring systems which have 5 to 40 aromatic ring atoms and are substituted by R4 radicals;
• Ar2 is the same or different at each instance and is selected from aromatic ring systems which have 6 to 40 aromatic ring atoms and are substituted by R5 radicals, and heteroaromatic ring systems which have 5 to 40 aromatic ring atoms and are substituted by R5 radicals, where the aromatic or heteroaromatic ring systems are joined in the ortho position to the V group and the nitrogen atom;
• V is the same or different at each instance and is selected from a bond, O, S, Si(R5)2 and C(R5)2;
• R1 is the same or different at each instance and is selected from H, D, F, Cl, Br, I, C(═O)R6, CN, Si(R6)3, N(R6)2, P(═O)(R6)2, OR6, S(═O)R6, S(═O)2R6, 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 said alkyl, alkoxy, alkenyl and alkynyl groups and said aromatic ring systems and heteroaromatic ring systems are each substituted by R6 radicals;
• and where one or more CH2 groups in said alkyl, alkoxy, alkenyl and alkynyl groups may be replaced by —R6C═CR6—, —C≡C—, Si(R6)2, C═O, C═NR6, —C(═O)O—, —C(═O)NR6—, NR6, P(═O)(R6), —O—, —S—, SO or SO2;
• R2 is the same or different at each instance and is selected from H, D, F, Cl, Br, I, C(═O)R6, CN, Si(R6)3, N(R6)2, P(═O)(R6)2, OR6, S(═O)R6, S(═O)2R6, 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 said alkyl, alkoxy, alkenyl and alkynyl groups and said aromatic ring systems and heteroaromatic ring systems are each substituted by R6 radicals;
• and where one or more CH2 groups in said alkyl, alkoxy, alkenyl and alkynyl groups may be replaced by —R6C═CR6—, —C≡C—, Si(R6)2, C—O, C═NR6, —C(═O)O—, —C(═O)NR6—, NR6, P(═O)(R6), —O—, —S—, SO or SO2;
• R3 is the same or different at each instance and is selected from H, D, F, Cl, Br, I, C(═O)R6, CN, Si(R6)3, N(R6)2, P(═O)(R6)2, OR6, S(═O)R6, S(═O)2R6, 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 R3 radicals may be joined to one another and may form a ring;
• where said alkyl, alkoxy, alkenyl and alkynyl groups and said aromatic ring systems and heteroaromatic ring systems are each substituted by R6 radicals;
• and where one or more CH2 groups in said alkyl, alkoxy, alkenyl and alkynyl groups may be replaced by —R6C═CR6—, —C≡C—, Si(R6)2, C═O, C═NR6, —C(═O)O—, —C(═O)NR6, NR6, P(═O)(R6), —O—, —S—, SO or SO2;
• R4 is the same or different at each instance and is selected from H, D, F, Cl, Br, I, C(═O)R6, CN, Si(R6)3, N(R6)2, P(═O)(R6)2, OR6, S(═O)R6, S(═O)2R6, 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 R4 radicals may be joined to one another and may form a ring;
• where said alkyl, alkoxy, alkenyl and alkynyl groups and said aromatic ring systems and heteroaromatic ring systems are each substituted by R6 radicals;
• and where one or more CH2 groups in said alkyl, alkoxy, alkenyl and alkynyl groups may be replaced by —R6C═CR6—, —C≡C—, Si(R6)2, C—O, C═NR6, —C(═O)O—, —C(═O)NR6, NR6, P(═O)(R6), —O—, —S—, SO or SO2;
• R5 is the same or different at each instance and is selected from H, D, F, Cl, Br, I, C(═O)R6, CN, Si(R6)3, N(R6)2, P(═O)(R6)2, OR6, S(═O)R6, S(═O)2R6, 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 R5 radicals may be joined to one another and may form a ring;
• where said alkyl, alkoxy, alkenyl and alkynyl groups and said aromatic ring systems and heteroaromatic ring systems are each substituted by R6 radicals;
• and where one or more CH2 groups in said alkyl, alkoxy, alkenyl and alkynyl groups may be replaced by —R6C═CR6—, —C≡C—, Si(R6)2, C—O, C═NR6, —C(═O)O—, —C(═O)NR6—, NR6, P(═O)(R6), —O—, —S—, SO or SO2;
• R6 is the same or different at each instance and is selected from H, D, F, Cl, Br, I, C(═O)R7, CN, Si(R7)3, N(R7)2, P(═O)(R7)2, OR7, S(═O)R7, S(═O)2R7, 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 R6 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 are each substituted by R7 radicals;
• and where one or more CH2 groups in the alkyl, alkoxy, alkenyl and alkynyl groups mentioned may be replaced by —R7C═CR7—, —C≡C—, Si(R7)2, C═O, C═NR7, —C(═O)O—, —C(═O)NR7—, NR7, P(═O)(R7), —O—, —S—, SO or SO2;
• R7 is the same or different at each instance and is selected from H, D, F, Cl, Br, I, CN, alkyl or alkoxy groups having 1 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 R7 radicals may be joined to one another and may form a ring;
• and where the alkyl, alkoxy, alkenyl and alkynyl groups, aromatic ring systems and heteroaromatic ring systems mentioned may be substituted by one or more radicals selected from F and CN.