Organic electroluminescent device

A compound of Formula (1) and Formula (2)

• wherein
• X is CR;
• R is on each occurrence, identically or differently, H, F, Cl, Br, I, CN, NH2, NO2, OH, N(R2)2, Si(R2)3, B(OR2)2, B(OH)2, Sn(R2)3, C(═O)R2, P(R2)2, P(═O)(R2)2, S(═O)R2, S(═O)2R2, a straight-chain alkyl, alkoxy or thioalkoxy group having up to 40 C atoms, optionally substituted by R3, or a branched or cyclic alkyl, alkoxy or thio-alkoxy group having 3 to 40 C atoms, optionally substituted by R3, wherein one or more non-adjacent C atoms of said straight-chain, branched or cyclic alkyl, alkoxy, or thio-alkoxy group are optionally replaced by N—R3, O, S, O—CO—O, CO—NR3, —CR3═CR3—, or —C═C—, and wherein one or more H atoms are optionally replaced by F, Cl, Br, I, CN, or an aromatic or heteroaromatic ring system, optionally substituted by one or more non-aromatic radicals R, or a combination of two, three or four of these systems;
• and wherein two or more substituents R optionally define a monocyclic or polycyclic aliphatic, monocyclic or polycyclic aromatic, or monocyclic or polycyclic heteroaromatic ring system with one another;
• R1 is one each occurrence, identically or differently, H, F, Cl, Br, I, CN, a straight-chain alkoxy or thioalkoxy chain having up to 40 C atoms, optionally substituted by R3, or a branched or cyclic alkyl, alkoxy or thioalkoxy chain having 3 to 4 C atoms, optionally substituted by R3, wherein one or more non-adjacent C atoms of said straight-chain, branched or cyclic alkyl, alkoxy, or thio-alkoxy group are optionally replaced by N—R3, O, S, O—CO—O, CO—O, CO—NR3, —CR3═CR3—, or —C═C—, and wherein one or more H atoms are optionally replaced by F, Cl, Br, I, CN, or an aromatic or heteroaromatic ring system, optionally substituted by one or more radicals R, or a combination of two, three or four of these systems;
• and wherein two or more substituents R1 optionally define a monocyclic or polycyclic aliphatic, monocyclic or polycyclic aromatic, or monocyclic or polycyclic heteroaromatic ring system with one another;
• with the proviso that the two substituents R1 bonded to C5 and/or the two substituents R1 bonded to C10 and/or the two substituents R1 bonded to C15 are an aromatic or heteroaromatic ring system;
• R2 is on each occurrence, identically or differently, a straight-chain alkyl group having up to 40 C atoms, optionally substituted by R3, or a branched or cyclic alkyl chain having 3 to 40 C atoms, optionally substituted by R3, wherein one or more non-adjacent C atoms of said straight-chain, branched or cyclic alkyl, alkoxy, or thio-alkoxy group are optionally replaced by N—R3, O, S, O—CO—O, CO—O, CO—NR3, —CR3═CR3—, or —C═C—, and wherein one or more H atoms are optionally replaced by F, Cl, Br, I, CN, or an aromatic or hetero-aromatic ring system, optionally substituted by one or more non-aromatic radicals R, or a combination of two, three or four of these systems;
• and wherein two or more substituents R2 optionally define a monocyclic or polycyclic aliphatic, monocyclic or polycyclic aromatic, or monocyclic or polycyclic heteroaromatic ring system with one another;
• R3 is on each occurrence, identically or differently, H or an aliphatic or aromatic hydrocarbon radical having up to 20 C atoms.