A symmetrical bis-azachalcones derivative L exhibited photophysical spectral perturbation along with simultaneous colour change from colourless to greenish yellow particularly in the presence of Cu(II) ion. The stereo-electronic contribution of complexation, in turn, a different coordination module enabled it to be a probe for the metal ion's selective colorimetric detection among all metal ions investigated. Its reversible signalling pattern as well as colour transition of its Cu(II) complexation selectively with L-proline through a displacement approach is also promising as chemosensing probe for the amino acid. (C) 2015 Elsevier B.V. All rights reserved.
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