The thiophene compound [...] group

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PROBLEM TO BE SOLVED : To provide a compound capable of absorbing long wavelength visible light even with short conjugation length and used for a sensitization dye for a dye-sensitization solar battery or the like.SOLUTION : There is provided a thiophene compound having a ferrocenyl thiocarbonyl group represented by the formula (1) or a phenyl group which may be substituted by an alkyl group having 1 to 4 carbon atoms. (1), where Rand Rare each independently a C1 to 10 alkyl group, a C1 to 10 alkoxy group, a C2 to 10 alkenyl group, a C2 to 10 alkynyl group, a C3 to 10 cycloalkyl group or a C4 to 10 cycloalkyl alkyl group, n1 and n2 are each independently an integer of 0 to 2, when n1 and n2 are 2, each Reach other and each Reach other may form a ring, Ar is an arylene group which may contain a hetero atom, m is an integer of 0 to 10, when m is 2 or more, each Ar are each independently, Xand Xare each independently a ferrocenyl group or a phenyl group which may be substituted by a C1 to 4 alkyl group.SELECTED DRAWING : None