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A novel compound, (E)-4-(4-(but-1-en-3-ynyl)phenyl)-2,2:6,2"-terpyridine 1 was synthesized from 4-(4-bromomethylphenyl)-2,2:6,2"-terpyridine phosphonium salt 2 and propargylaldehyde via Wittig reaction, and characterized by EI-MS and 1H NMR as well as elemental analysis. The spectral changes of the compound in the presence of transition metal ions, such as Cu(Ⅰ) or Zn(Ⅱ), are investigated.