Simple C3-symmetric triaminoguanidine-triphenylamine conjugate as an efficient colorimetric sensor for Cu(II) and fluorescent sensor for Fe(III) ions

The design and construction of novel C3-symmetric triaminoguanidine-triphenylamine conjugate (L) has been demonstrated and it displays positive solvatochromic behaviour with an increase in solvent polarity. The probe L acts as a selective colorimetric sensor for Cu2+ ions over other metal ions. Further, it shows high selective and sensitive detection of Fe3+ ions through turn-on fluorescence response. Moreover, the detection limits for Cu2+ and Fe3+ ions were found to be within the allowable range of the World Health Organisation (30 μM). The real-time application of the probe was showed by paper strip experiments as well as detection of Fe3+ ions in pharmaceutical tablets. [Display omitted] •Sensing application of Triaminoguanidine-triphenylamine conjugate was established.•Probe L selectively detects Cu2+ ions by colorimetric manner.•Probe L act as a turn-on fluorescent sensor for Fe3+ ion.•Practical applicability of the probe was demonstrated by paper-strip experiments.•Probe L qualitatively detect Fe3+ ions content in pharmaceutical tablets.