A new tetramine bis(2-naphthol)-derivative fluorescent chemosensor for aluminum ion (Al<SUP>3+</SUP>)

Golbedaghi R., Ildiz G., Azadbakht R., Fausto R.

JOURNAL OF MOLECULAR STRUCTURE, cilt.1250, 2022 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 1250
  • Basım Tarihi: 2022
  • Doi Numarası: 10.1016/j.molstruc.2021.131775
  • Dergi Adı: JOURNAL OF MOLECULAR STRUCTURE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Chemical Abstracts Core, INSPEC
  • Anahtar Kelimeler: 1H- and 13C NMR, Al3+ cation, DFT and TD-DFT calculations, Fluorescence chemosensor, Tetramine bis(2-naphtol) derivative, UV-Vis absorption and fluorescence emission spectroscopies
  • İstanbul Kültür Üniversitesi Adresli: Evet

Özet

A new tetramine bis(2-naphthol)-derivative was synthesized and its structure investigated by H-1- and C-13 NMR, UV-Vis absorption and fluorescence spectroscopies, as well as through density functional theory calculations (including time-dependent DFT). The effect of a series of metal ions (Ag+, Al3+, Ba2+, Ca2+, Cd2+, Co2+, Cs (+), Cu2+, Fe2+, Fe3+, K+, Mg2+, Mn2+, Ni2+, Pb2+ and Zn2+) on the fluorescence spectra of the synthesized compound was then investigated and it was observed that the presence of Al3+ ion causes a strong increase in the fluorescence emission of the ligand, by about 70 times. This exceptional intensification is specific for Al3+ within the whole series of ions investigated, together with the selectivity found for many of the remaining ions (in particular the ions of Groups I and II of the Periodic Table and Mn2+), makes the compound a promising candidate to act as chemosensor for Al3+. Possible structures for the ligand:Al3+ complex are suggested based on DFT results. TD-DFT calculations performed on these structures suggest that the fluorescence enhancement upon binding of Al3+ to the ligand results most probably from metal-to-ligand charge transfer where the acceptor groups of the ligand are the naphthol moieties. (C) 2021 Elsevier B.V. All rights reserved.