Metal complexes for use as emitters in organic electroluminescence devices

A compound of formula (1):

• wherein
• M is the same or different in each instance and is an organometallic iridium complex comprising three bidentate, monoanionic ligands or one tripodal, hexadentate, trianionic ligand;
• Ar is the same or different in each instance and is a linear-bonded arylene or a linear-bonded heteroarylene group which has 6 to 30 aromatic ring atoms and is optionally substituted by one or more R radicals;
• B is a group of formula (2):
• wherein
• the dotted lines denote the linkages of this group to Ar or to RB;
• Y1, Y2, and Y3
• are the same or different in each instance and are CR2, CR2—CR2, CR2—CR2—CR2, CR2—CR2—CR2—CR2, CR—CR, or an ortho-bonded phenylene group which is optionally substituted by one or more R radicals;
• and wherein the Y1, Y2, and/or Y3 groups are optionally joined to one another by a single bond or via R radicals so as to define an oligocyclic group;
• RB is the same or different in each instance and is M or H, D, a straight-chain alkyl group having 1 to 20 carbon atoms or a branched or cyclic alkyl group having 3 to 20 carbon atoms, wherein the alkyl group is optionally substituted in each case by one or more R1 radicals, or an aromatic or heteroaromatic ring system which has 5 to 40 aromatic ring atoms and is optionally substituted in each case by one or more R1 radicals;
• R is the same or different in each instance and is H, D, F, Cl, Br, I, N(R1)2, CN, NO2, OR1, SR1, COOH, C(═O)N(R1)2, Si(R1)3, B(OR1)2, C(═O) R1, P(═O) (R1)2, S(═O) R1, S(═O)2R1, OSO2R1, a straight-chain alkyl group having 1 to 20 carbon atoms or a branched or cyclic alkyl group having 3 to 20 carbon atoms, wherein the alkyl group is optionally substituted in each case by one or more R1 radicals, wherein one or more nonadjacent CH2 groups are optionally replaced by R1C═CR1, C≡C, Si(R1)2, C═O, NR1, O, S, or CONR1, or an aromatic or heteroaromatic ring system which has 5 to 40 aromatic ring atoms and is optionally substituted in each case by one or more R1 radicals;
• and wherein two R radicals together optionally define a ring system;
• R1 is the same or different in each instance and is H, D, F, Cl, Br, I, N(R2)2, CN, NO2, OR2, SR2, Si(R2)3, B(OR2)2, C(═O) R2, P(═O) (R2)2, S(═O) R2, S(═O)2R2, OSOR2, a straight-chain alkyl group having 1 to 20 carbon atoms or a branched or cyclic alkyl group having 3 to 20 carbon atoms, wherein the alkyl group is optionally substituted in each case by one or more R2 radicals, wherein one or more nonadjacent CH2 groups are optionally replaced by R2C≡CR2, C≡C, Si(R2)2, C—O, NR2, O, S, or CONR2, or an aromatic or heteroaromatic ring system which has 5 to 40 aromatic ring atoms and is optionally substituted in each case by one or more R2 radicals;
• and wherein two or more R1 radicals together optionally define a ring system;
• R2 is the same or different in each instance and is H, D, F, or an aliphatic, aromatic, or heteroaromatic organic radical having 1 to 20 carbon atoms, wherein one or more hydrogen atoms are optionally replaced by F;
• n is 1, 2, 3, 4, 5, or 6;
• p is the same or different in each instance and has a value from 1 to 100;
• q is the same or different in each instance and has a value from 0 to 100;
• and
• m is the same or different in each instance and has a value from 1 to 100;
• and
• provided that Ar is substituted by at least two alkyl groups.