The new chiral N,N'-bis(squaryl)-3,6-pyridazinrlene bis(methylamine) has been synthesized by the reaction 3,6-diformylpyridazine with methyl lactamate, o-aminophenol and squaric acid. The structures of the new compound and its intermediates were confirmed by IR, ¹H NMR spectra and elemental analysis. The effect of metal ions on the fluorescence characteristics of the compound was also investigated. The selective interaction between metal ions (Cu^2＋, Ni^2＋) and the compound led to obvious fluorescence quenching.

Key words: pyridazine derivative, chiral methyl N-squaryl lactamate, synthesis, ion recognition, fluorescence quenching, fluorescence