Materials for organic electroluminescent devices

A conjugated, partially conjugated or non-conjugated polymer, oligomer or dendrimer comprising one or more compounds of the formula (1b)

• wherein
• Y and Z are, identically or differently, N, P, P═O, PF2, P═S, As, As═O, As═S, Sb, Sb═O, Sb═S, C═O, O, S, Se, Te, S═O, SO2, Se═O, SeO2, Te═O or TeO2;
• Ar4, Ar5, Ar6 and Ar7 are on each occurrence, identically or differently, an aromatic or heteroaromatic ring system having 5 to 40 aromatic ring atoms, which are optionally substituted by one or more radicals R1;
• E is on each occurrence, identically or differently, a single bond, N(R1), O, S, C(R1)2, Si(R1)2 or B(R1);
• R1 is on each occurrence, identically or differently, H, F, Cl, Br, I, CN, NO2, Si(R2)3, B(OR2)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 is optionally substituted by one or more radicals R2, where one or more non-adjacent CH2 groups is optionally replaced by —R2C═CR2—, —C≡C—,Si(R2)2, Ge(R2)2, Sn(R2)2, C═O, C═S, C═Se, C═NR2, —O—, —S—, —COO— or —CONR2— and where one or more H atoms is optionally replaced by F, Cl, Br, I, CN or NO2, or an aromatic or heteroaromatic ring system having 5 to 40 aromatic ring atoms, which is optionally substituted by one or more non-aromatic radicals R1, or an aryloxy or heteroaryloxy group having 5 to 40 aromatic ring atoms, which is optionally substituted by one or more non-aromatic radicals R1, or a combination of these systems;
• two or more substituents R1 optionally form a mono- or polycyclic ring system with one another;
• R2 is on each occurrence, identically or differently, H or an aliphatic or aromatic hydrocarbon radical having 1 to 20 C atoms;
• X1 are on each occurrence, identically or differently, a bridge which, with Ar1 and Ar2, defines a cyclic system selected from C(R1)2, Si(R1)2, C═O, C═NR1, C═C(R1)2, O, S, S═O, SO2, N(R1), P(R1), P(═O)R1, P(═S)R1, B(R1) or a combination of two, three or four of these groups;
• X2 are on each occurrence, identically or differently, a bridge which, with Ar2 and Ar3, defines a cyclic ring system selected from B(R1), C(R1)2, Si(R1)2, C═O, C═NR1, C═C(R1)2, O, S, S═O,SO2, N(R1), P(R1), P(═O)R1, P(═S)R1 or a combination of two, three or four of these groups;
• q and r are on each occurrence 1 if the corresponding central atom of the group Y or Z is an element from the 5th main group and on each occurrence are equal to 0 if the corresponding central atom of the group Y or Z is an element from the 4th or 6th main group;
• s is 1, 2 or 3;
• and
• t is on each occurrence, identically or differently, 0 or 1, where t=0 means that R1 radicals are bonded instead of the group E;
• furthermore, t=0 if q=0 and t=0, if r=0,
• wherein one or more radicals R1 in the compound of the formula (1b) represent a bond to the polymer, oligomer or dendrimer.