Spectroscopic and photophysical studies of a naphthalene-based emissive probe for metal cations

Catherine S. de Castro, J. Sérgio Seixas De Melo, Adrian Fernandez-Lodeiro, Cristina Nunez, C. Lodeiro

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4 Citations (Scopus)

Abstract

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 Cu2 +, Zn2 +, Cd2 + or Hg2 + 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. © 2014 Elsevier B.V.
Original languageEnglish
Pages (from-to)27-32
Number of pages6
JournalInorganic Chemistry Communications
Volume47
DOIs
Publication statusPublished - Sep 2014

Keywords

  • Dimer
  • Fluorescence quenching
  • Metals
  • Naphthalene
  • Time-resolved fluorescence

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