PROBLEM TO BE SOLVED: To provide a polyacetylene compound improved in solubility to polar solvents (e.g. methanol and dimethyl sulfoxide) by introducing a sulfoxide group which is a polar substituent group into a polyacetylene structure.
SOLUTION: The acetylene compound has a sulfoxide group represented by formula (1) [wherein Z is a substituted or unsubstituted aromatic ring, a substituted or unsubstituted heterocyclic ring or a cyclic or a chain hydrocarbon; R is an alkyl group (a hydrocarbon group), a halogen, an ether, an ester, a carbonyl, a carboxy, an alcohol, a nitrile, an amino, an amide, a thioether, a thioester, a thiol, a dithiol substituent group or a substituted or unsubstituted aromatic ring, heterocyclic ring or cyclic hydrocarbon].
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