Materials for organic electroluminescent devices

A compound of formula (1-1) or formula (1-2),

• wherein:
• X is O or S;
• Y is O or S;
• Ar is selected from the group consisting of 1-, 2-, 3- or 4-fluorenyl, pyridyl, pyrimidinyl and 1-, 2-, 3- or 4-dibenzothienyl, each of which may be substituted by one or more R radicals;
• R which is bonded to Ar for Ar=pyridyl, pyrimidyl or 1-, 2-, 3- or 4-dibenzothienyl, is the same or different at each instance and is selected from the group consisting of H, D, F, Cl, Br, I, CN, NO2, N(Ar1)2, N(R4)2, C(═O)Ar1, C(═O)R4, P(═O)(Ar1)2, P(Ar1)2, B(Ar1)2, a straight-chain alkyl, alkoxy or thioalkyl group having 1 to 20 carbon atoms or a branched or cyclic alkyl, alkoxy or thioalkyl group having 3 to 20 carbon atoms or an alkenyl group having 2 to 20 carbon atoms, each of which may be substituted by one or more R4 radicals, where one or more nonadjacent CH2 groups may be replaced by R4C═CR4, C═O, C═S, C═NR4, P(═O)(R4), SO, SO2, NR4, O, S or CONR4 and where one or more hydrogen atoms may be replaced by D, F, Cl, Br, I, CN or NO2, an aromatic or heteroaromatic ring system which has 5 to 40 aromatic ring atoms and may be substituted in each case by one or more R4 radicals, an aryloxy or heteroaryloxy group which has 5 to 40 aromatic ring atoms and may be substituted by one or more R1 radicals, or an aralkyl or heteroaralkyl group which has 5 to 40 aromatic ring atoms and may be substituted by one or more R4 radicals;
• at the same time, it is optionally possible for two R substituents bonded to adjacent carbon atoms to form a monocyclic or polycyclic aliphatic ring system which may be substituted by one or more R4 radicals;
• R which is bonded to Ar for Ar=1-, 2-, 3- or 4-fluorenyl, is the same or different at each instance and is selected from the group consisting of H, D, F, Cl, I, CN, NO2, N(Ar1)2, N(R4)2, C(═O)Ar1, C(═O)R4, P(═O)(Ar1)2, P(Ar1)2, B(Ar1)2, a straight-chain alkyl, alkoxy or thioalkyl group having 1 to 20 carbon atoms or a branched or cyclic alkyl, alkoxy or thioalkyl group having 3 to 20 carbon atoms or an alkenyl group having 2 to 20 carbon atoms, each of which may be substituted by one or more R4 radicals, where one or more nonadjacent CH2 groups may be replaced by R4C═CR4, C═O, C═S, C═NR4, P(═O)(R4), SO, SO2, NR4, O, S or CONR4 and where one or more hydrogen atoms may be replaced by D, F, Cl, Br, I, CN or NO2, an aryloxy or heteroaryloxy group which has 5 to 40 aromatic ring atoms and may be substituted by one or more R1 radicals, or an aralkyl or heteroaralkyl group which has 5 to 40 aromatic ring atoms and may be substituted by one or more R4 radicals;
• at the same time, it is optionally possible for two R substituents bonded to the same carbon atom or to adjacent carbon atoms to form a monocyclic or polycyclic aliphatic ring system which may be substituted by one or more R4 radicals;
• R1 is the same or different at each instance and is selected from the group consisting of H, D, F, Cl, I, CN, NO2, N(Ar1)2, N(R4)2, C(═O)Ar1, C(═O)R4, P(═O)(Ar1)2, P(Ar1)2, B(Ar1)2, a straight-chain alkyl, alkoxy or thioalkyl group having 1 to 20 carbon atoms or a branched or cyclic alkyl, alkoxy or thioalkyl group having 3 to 20 carbon atoms or an alkenyl group having 2 to 20 carbon atoms, each of which may be substituted by one or more R4 radicals, where one or more nonadjacent CH2 groups may be replaced by R4C═CR4, C═O, C═S, C═NR4, P(═O)(R4), SO, SO2, NR4, O, S or CONR4 and where one or more hydrogen atoms may be replaced by D, F, Cl, Br, I, CN or NO2, an aromatic ring system which has 5 to 40 aromatic ring atoms and may be substituted in each case by one or more R4 radicals, an aryloxy or heteroaryloxy group which has 5 to 40 aromatic ring atoms and may be substituted by one or more R4 radicals, or an aralkyl or heteroaralkyl group which has 5 to 40 aromatic ring atoms and may be substituted by one or more R4 radicals;
• R2 is the same or different at each instance and is selected from the group consisting of H, D, F, Cl, Br, I, CN, NO2, N(Ar1)2, N(R4)2, C(═O)Ar1, C(═O)R4, P(═O)(Ar1)2, P(Ar1)2, B(Ar1)2, a straight-chain alkyl, alkoxy or thioalkyl group having 1 to 20 carbon atoms or a branched or cyclic alkyl, alkoxy or thioalkyl group having 3 to 20 carbon atoms or an alkenyl group having 2 to 20 carbon atoms, each of which may be substituted by one or more R4 radicals, where one or more nonadjacent CH2 groups may be replaced by R4C═CR4, C═O, C═S, C═NR4, P(═O)(R4), SO, SO2, NR4, O, S or CONR4 and where one or more hydrogen atoms may be replaced by D, F, Cl, Br, I, CN or NO2, an aromatic ring system which has 5 to 40 aromatic ring atoms and may be substituted in each case by one or more R4 radicals, an aryloxy or heteroaryloxy group which has 5 to 40 aromatic ring atoms and may be substituted by one or more R4 radicals, or an aralkyl or heteroaralkyl group which has 5 to 40 aromatic ring atoms and may be substituted by one or more R4 radicals;
• R3 is the same or different at each instance and is selected from the group consisting of H, D, F, Cl, Br, I, CN, NO2, N(Ar1)2, N(R4)2, C(═O)Ar1, C(═O)R4, P(═O)(Ar1)2, P(Ar1)2, B(Ar1)2, a straight-chain alkyl, alkoxy or thioalkyl group having 1 to 20 carbon atoms or a branched or cyclic alkyl, alkoxy or thioalkyl group having 3 to 20 carbon atoms or an alkenyl group having 2 to 20 carbon atoms, each of which may be substituted by one or more R4 radicals, where one or more nonadjacent CH2 groups may be replaced by R4C═CR4, C═O, C═S, C═NR4, P(═O)(R4), SO, SO2, NR4, O, S or CONR4 and where one or more hydrogen atoms may be replaced by D, F, Cl, Br, I, CN or NO2, an aromatic ring system which has 5 to 40 aromatic ring atoms and may be substituted in each case by one or more R4 radicals, an aryloxy or heteroaryloxy group which has 5 to 40 aromatic ring atoms and may be substituted by one or more R4 radicals, or an aralkyl or heteroaralkyl group which has 5 to 40 aromatic ring atoms and may be substituted by one or more R4 radicals;
• Ar1 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 nonaromatic R4 radicals;
• at the same time, two Ar1 radicals bonded to the same phosphorus atom or boron atom may also be bridged to one another by a single bond or a bridge selected from N(R4), C(R4)2, O and S;
• R4 is the same or different at each instance and is selected from the group consisting of H, D, F, Cl, Br, I, CN, NO2, N(R5)2, C(═O)R5, a straight-chain alkyl, alkoxy or thioalkyl group having 1 to 20 carbon atoms or a branched or cyclic alkyl, alkoxy or thioalkyl group having 3 to 20 carbon atoms or an alkenyl group having 2 to 20 carbon atoms, each of which may be substituted by one or more R5 radicals, where one or more nonadjacent CH2 groups may be replaced by R5═CR5, C═O, C═S, C═NR5, P(═O)(R5), SO, SO2, NR5, O, S or CONR5 and where one or more hydrogen atoms may be replaced by D, F, Cl, Br, I, CN or NO2, an aromatic or heteroaromatic ring system which has 5 to 40 aromatic ring atoms and may be substituted in each case by one or more R5 radicals, an aryloxy or heteroaryloxy group which has 5 to 40 aromatic ring atoms and may be substituted by one or more R5 radicals, or an aralkyl or heteroaralkyl group which has 5 to 40 aromatic ring atoms and may be substituted by one or more R5 radicals;
• at the same time, it is optionally possible for two R4 substituents bonded to the same carbon atom or adjacent carbon atoms to form a monocyclic or polycyclic, aliphatic or heteroaromatic ring system which may be substituted by one or more R5 radicals;
• R5 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 having 5 to 30 aromatic ring atoms 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, it is possible for two or more adjacent R5 substituents together to form a mono- or polycyclic, aliphatic ring system.