Spectroscopic and Photophysical Studies of a Naphthalene-Based Emissive Probe for Metal Cations
نویسندگان
چکیده
A comprehensive photophysical characterization of a bis-naphthalene derivative, L, was carried out in acetonitrile, using UV-Vis absorption, steady-state and time-resolved emission spectroscopy. It was found that in the 250-400 nm region, the absorption spectra showed two bands with maxima at ~ 220 nm and ~292 nm whereas the emission spectrum showed a band settled between 300 and 550 nm. A detailed time-resolved investigation (in the ps and ns time domain) showed that the fluorescence decay of L in dichloromethane was bi-exponential indicative of the presence of a ground-state equilibrium involving two species: monomeric (absorption of a single naphthalene unit) and dimeric. Upon addition of Cu, Zn, Cd or Hg metal cations in acetonitrile a quenching of the fluorescence emission was observed. From time-resolved data, it is shown that the fluorescence contribution of the species with the longest decay time was sensitive to the explored metal ions.
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