Patent ID: 8852756

Claim:
A compound of the formula (1) wherein Y and Z are, identically or differently, N, P, P═O, PF 2 , P═S, As, As═O, As═S, Sb, Sb═O, Sb═S, C═O, O, S, Se, Te, S═O, SO 2 , Se═O, SeO 2 , Te═O or TeO 2 ; Ar 1 , Ar 2 and Ar 3 are on each occurrence, identically or differently, a benzene, or pyridine; Ar 4 , Ar 5 , Ar 6 and Ar 7 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 R 1 ; E is on each occurrence, identically or differently, a single bond, N(R 1 ), O,S, C(R 1 ) 2 , Si(R 1 ) 2 or B(R 1 ); R 1 is on each occurrence, identically or differently, H, F, CN, NO 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, each of which is optionally substituted by one or more radicals R 2 , where one or more non-adjacent CH 2 groups is optionally 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 is optionally replaced by F, Cl, Br, I, CN or NO 2 , 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 R 1 , or an aryloxy or heteroaryloxy group having 5 to 40 aromatic ring atoms, which is optionally substituted by one or more non-aromatic radicals R 1 , or a combination of these systems; two or more substituents R 1 optionally form a mono- or polycyclic ring system with one another; R 2 is on each occurrence, identically or differently, H or an aliphatic or aromatic hydrocarbon radical having 1 to 20 C atoms; X 1 and X 4 are on each occurrence, identically or differently, a bridge which, with Ar 1 and Ar 2 , defines a cyclic system selected from C(R 1 ) 2 , Si(R 1 ) 2 , C═O, C═NR 1 , C═C(R 1 ) 2 , O,S, S═O, SO 2 , N(R 1 ), P(R 1 ), P(═O)R 1 , P(═S)R 1 , B(R 1 ) or a combination of two, three or four of these groups; X 2 and X 3 are on each occurrence, identically or differently, a bridge which, with Ar 2 and Ar 3 , defines a cyclic ring system selected from B(R 1 ), C(R 1 ) 2 , Si(R 1 ) 2 , C═O, C═NR 1 , C═C(R 1 ) 2 , O, S, S═O, SO 2 , N(R 1 ), P(R 1 ), P(═O)R 1 , P(═S)R 1 or a combination of two, three or four of these groups; p=0; one of the two indices n and o is equal to 1, and the other of the two indices n and o is equal to 0; q and r are on each occurrence 1 if the corresponding central atom of the group Y or Z is an element from the 5 th 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 4 th or 6 th 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 R 1 radicals are bonded instead of the group E; furthermore, t=0 if q=0 and t=0, if r=0.