Patent ID: 7153980

Claim:
A thiophene-containing compound represented by the following formula (I): wherein, in formula (I), Ar represents one or more thiophene rings, a monovalent aromatic group containing one or more thiophene rings or a monovalent aromatic group; X represents one or more thiophene rings, a monovalent or divalent aromatic group containing one or more thiophene rings or a monovalent or divalent aromatic group, in which all of the thiophene rings and aromatic groups may be unsubstituted or further may have a substituent; R 1 represents a hydrogen atom, an alkyl group, a substituted or unsubstituted aryl group or a substituted or unsubstituted aralkyl group; n indicates an integer of from 0 to 5; and k indicates 0 or 1; provided that at least one of Ar and X contains a thiophene ring.