Radiative decay channel assessment to understand the sensing mechanism of a fluorescent turn-on Al3+ chemosensor

Manuel A. Treto-Suárez, Yoan Hidalgo-Rosa, Eduardo Schott, Ximena Zarate, Dayan Páez-Hernández

Resultado de la investigación: Contribución a una revistaArtículo

1 Cita (Scopus)

Resumen

The turn-on luminescent chemosensor [2-Hydroxy-1-naphthaldehyde-(2-pyridyl) hydrazone] (L), selective to Al3+ ions, was studied by means of density functional theory (DFT) and time-dependent-DFT quantum mechanics calculations. The UV-Vis absorption and the radiative channel from the adiabatic S1 excited state were assessed in order to elucidate the selective sensing mechanism of L to Al3+ ions. We found that twisted intramolecular charge transfer (TICT) and photoelectron transfer (PET), which alter the emissive state, are responsible for the luminescence quenching in L. After coordination with Al3+, the TICT is blocked, and PET is no longer possible. So, the emission of the coordination complex is activated, and a fluorescence effect enhanced by chelation is observed. For compounds with Zn2+ and Cd2+, the luminescence quenching is caused by PET, while for Ni2+, ligand to metal charge transfer is the prominent mechanism. To go into more detail, the metal-ligand interaction was analyzed via the Morokuma-Ziegler energy decomposition scheme and the natural orbital of chemical valence.

Idioma originalInglés
Número de artículoe26083
PublicaciónInternational Journal of Quantum Chemistry
DOI
EstadoEn prensa - 1 ene 2019

Áreas temáticas de ASJC Scopus

  • Óptica y física atómica y molecular
  • Física de la materia condensada
  • Química física y teórica

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