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Abstract
The lanthanide complex [Eu(Tpy–NH2)2Cl2]Cl (1), where Tpy–NH2 is 4-(paminophenyl)-2,2:6,2”-terpyridine, was synthesized. Its photophysical properties, e.g., Fourier Transform Infrared (FTIR) spectra, UV–visible absorption spectra, and luminescence properties, in the presence of various metal ions were studied. Tpy-NH2 acts as chromophore, or light-harvesting photo sensitizing antenna moiety, for Eu3+ luminescence. The bright luminescence in 1 suggests that favourable photo-induced energy transfer occurs from the Tpy-NH2 antenna to the Eu3+ to fill the long-lived emissive excited states of Eu3+ f–f transitions. The luminescence spectral profile of complex 1 showed a characteristic sharp emission band maximum for 5D0 →7F2 f–f transitions at 614 nm originating from Eu3+ ions. The luminescence studies revealed that this material possesses a highly selective fluorescence quenching response to Fe3+ ions in liquid suspension. The dose-dependent fluorescent quenching showed good linearity, and a Fe3+ detection limit of 0.655 μM was calculated for complex 1. This material can potentially be used as a fluorosensor for sensing Fe3+ ions; its luminescence quenching response can be explained in terms of a competitive absorption mechanism.
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