Patent ID: 8618533

Claim:
A compound of the formula (Ib) in which: Aâ€² is a fused ring system formed from at least 3 fused rings which each independently have 4 to 10 ring members and may be saturated or mono- or polyunsaturated and may be unsubstituted or substituted by one or more substituents selected from alkyl, cycloalkyl, heterocycloalkyl, aryl, heteroaryl and groups with donor or acceptor action, wherein the fused ring system has at least one heteroatom-containing group in the fused ring system itself or in at least one substituent; are each independently an Si-comprising ring which has 4 to 10, wherein the ring may be saturated or mono- or polyunsaturated and, in addition to the silicon atom, may have one or more further heteroatom-containing groups and may be unsubstituted or substituted by one or more substituents selected from alkyl, cycloalkyl, heterocycloalkyl, aryl, heteroaryl and groups with donor or acceptor action, wherein the Si-comprising ring may additionally be part of a fused ring system formed from at least 2, wherein the further ringsâ€”in addition to the Si-comprising ringâ€”in the fused ring system may each independently be saturated or mono- or polyunsaturated and may be unsubstituted or substituted by one or more substituents selected from alkyl, cycloalkyl, heterocycloalkyl, aryl, heteroaryl and groups with donor or acceptor action, and may have one or more heteroatom-containing groups; R 1 , R 1â€² are each independently a fused ring system formed from at least 3 fused rings which each independently have 4 to 10 ring members and may be saturated or mono- or polyunsaturated and unsubstituted or substituted by one or more substituents selected from alkyl, cycloalkyl, heterocycloalkyl, aryl, heteroaryl, SiR 2 R 3 R 4 and groups with donor or acceptor action, wherein the fused ring system has at least one heteroatom in the fused ring system itself or in at least one substituent, alkyl, cycloalkyl, heterocycloalkyl, aryl or heteroaryl, wherein the aforementioned groups may be unsubstituted or substituted by one or more substituents selected from alkyl, cycloalkyl, heterocycloalkyl, aryl, heteroaryl, and groups with donor or acceptor action.