Simple structural compounds 1 to 3 were synthesized.The presence of Cu~(2+) resulted in the fluorescence and absorption spectra change of 1 and 2,which indicated that 1 and 2 showed a highly selective response to Cu~(2+) over other metal ions.However,3 showed no selectivity for metal ions,which means that the compound could bind with several metal ions,such as,Ni~(2+),Zn~(2+),Cd~(2+).Hg~(2+), Pb~(2+),Fe~(3+),Mg~(2+),Ca~(2+),and Co~(2+),except Cu~(2+) and Ag~+.The different spectral responses were attributed to the difference in binding sites for 1 and 3. Simple structural compounds 1 to 3 were synthesized. The presence of Cu ~ (2+) resulted in the fluorescence and absorption spectra change of 1 and 2, which indicated that 1 and 2 showed a highly selective response to Cu ~ (2+) over Other metal ions. Even, 3 showed no selectivity for metal ions, which means that the compound could bind with several metal ions, such as, Ni ~ (2 +), Zn ~ (2 +), Cd ~ (2+). Hg2 +, Pb2 +, Fe3 +, Mg2 +, Ca2 +, Co2 +, Cu2 + and Ag ~ + .The different spectral responses were attributed to the difference in binding sites for 1 and 3.