Materials for organic electroluminescent devices

1. A compound of the formula (4e):

where the following applies to the symbols and indices used:

R is on each occurrence, identically or differently, H, D, F, Cl, Br, I, N(Ar) 2 , C(═O)Ar, P(═O)Ar 2 , S(═O)Ar, S(═O) 2 Ar, CR 2 ═CR 2 Ar, CN, NO 2 , Si(R 2 ) 3 , B(OR 2 ) 2 , OSO 2 R 2 , a straight-chain alkyl, alkoxy or thioalkoxy group having 1 to 40 C atoms or a branched or cyclic alkyl, alkoxy or thioalkoxy group having 3 to 40 C atoms, each of which may be substituted by one or more radicals R 2 , where one or more non-adjacent CH 2 groups may be replaced by R 2 C═CR 2 , C≡C, Si(R 2 ) 2 , Ge(R 2 ) 2 , Sn(R 2 ) 2 , C═O, C═S, C═Se, C═NR 2 , P(═O)(R 2 ), SO, SO 2 , NR 2 , O, S or CONR 2 and where one or more H atoms may be replaced by D, F, Cl, Br, I, CN or NO 2 , or an aryl or heteroaryl group having 6 to 40 ring atoms, which may in each case be substituted by one or more radicals R 2 , or a heteroaromatic system having 5 to 60 aromatic ring atoms, which may in each case be substituted by one or more radicals R 2 , or an aryloxy or heteroaryl-oxy group having 5 to 40 aromatic ring atoms, which may be substituted by one or more radicals R 2 , or an aralkyl or heteroaralkyl group having 5 to 40 aromatic ring atoms, which may be substituted by one or more radicals R 2 , or a combination of these systems; two or more substituents R here, together with the atoms to which they are bonded, may also form a mono- or polycyclic aliphatic or aromatic ring system with one another;

Ar is on each occurrence, identically or differently, an aromatic or heteroaromatic ring system which may be substituted by one or more radicals R 1 ;

R 1 is on each occurrence, identically or differently, H, D, F, Cl, Br, I, CN, NO 2 , CF 3 , B(OR 2 ) 2 , Si(R 2 ) 3 , a straight-chain alkyl, alkoxy or thioalkoxy group having 1 to 40 C atoms or a branched or cyclic alkyl, alkoxy or thioalkoxy group having 3 to 40 C atoms, or an alkenyl or alkynyl group having 2 to 40 C atoms, each of which may be substituted by one or more radicals R 2 , where one or more non-adjacent CH 2 groups may be replaced by —R 2 C═CR 2 —, —C≡C—, Si(R 2 ) 2 , Ge(R 2 ) 2 , Sn(R 2 ) 2 , C═O, C═S, C═Se, C═NR 2 , —O—, —S—, —COO— or —CONR 2 — and where one or more H atoms may be replaced by F, Cl, Br, I, CN or NO 2 , or arylamines, or substituted or un-substituted carbazoles, which may in each case be substituted by one or more radicals R 2 , or an aryl or heteroaryl group having 5 to 40 ring atoms, which may be substituted by one or more aromatic, heteroaromatic or non-aromatic radicals R 2 , or an aromatic or heteroaromatic ring system having 5 to 60 aromatic ring atoms, which may be substituted by one or more non-aromatic radicals R 2 , or an aryloxy or heteroaryloxy group having 5 to 40 aromatic ring atoms, which may be substituted by one or more radicals R 2 , or an aralkyl or heteroaralkyl group having 5 to 40 aromatic ring atoms, which may be substituted by one or more radicals R 2 , or a combination of these systems; two or more substituents R 1 here may also form a mono- or poly-cyclic aliphatic or aromatic ring system with one another, together with the atoms to which they are bonded;

R 2 is on each occurrence, identically or differently, H, D or an aliphatic hydrocarbon radical having 1 to 20 C atoms or an aryl or heteroaryl group having 5 to 40 ring atoms, or a combination of these groups;

the following compound is furthermore excluded from the invention:

2. The compound according to claim 1 , wherein R is selected from H, D, N(Ar) 2 , a substituted or unsubstituted arylamine, a straight-chain alkyl group having 1 to 20 C atoms, a branched alkyl group having 3 to 20 C atoms, or an aromatic or heteroaromatic ring system having 5 to 40 ring atoms.

3. The compound according to claim 2 , wherein the heteroaromatic system is selected from substituted or unsubstituted pyridine, triazine, pyrimidine, benzimidazole, thiophene, triphenylamine or combinations of these groups and/or combinations of these groups with phenyl or naphtyl.

4. The compound according to claim 1 , wherein R 1 is selected on each occurrence, independently of one another, from alkyl, substituted or unsubstituted triazine, pyridine, pyrimidine, pyrazine, phenyl, biphenyl, terphenyl, naphthyl, anthracenyl and carbazole, and two radicals R 1 which are bonded to the same C atom together with the atom(s) to which they are bonded may also form an aliphatic, aromatic or heteroaromatic ring.

5. An electronic device comprising at least one compound according to claim 1 .

6. An organic electroluminescent device which comprises the compound according to claim 1 is employed in an emitting layer and/or as electron-transport material and/or as hole-transport material and/or as hole-injection material and/or as hole-blocking material.

7. An electronic device which comprises the compound according to claim 1 is employed as matrix material for phosphorescent emitters in an emitting layer.

8. A mixture comprising at least one compound according to claim 1 and at least one phosphorescent emitter.

9. A formulation comprising at least one compound according to claim 1 and at least one solvent.

10. A founulation comprising the mixture according to claim 8 and at least one solvent.