Fluorescence in complexes based on quinolines-derivatives: a search for better fluorescent probes

Author(s)

Mecca, Carolina Z. P. ; Fonseca, Fernando L. A. ; Bagatin, Izilda A.

• Document type: Journal article
• Source: SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY; v. 168, p. 104-110, NOV 5 2016.
• Web of Science Citations: 4

Abstract

Quinoline-derived fluorescent complexes were designed; synthesized by the reaction of 5-nitro-8-hydroxyquinoline and 5-chloro-8-hydroxyquinoline with Al3+, Mg2+, Zn2+, and Cd2+ salts (1-8); and characterized. The H-1 NMR spectra of complexes 1 and 5, containing A13+, were consistent with an octahedral structure having approximate D-3 symmetry, and the results supported the favored facial isomer (fac). Data for complexes 2-4 and 6-8 supported the formation of tetrahedral structures. Intense luminescence was detected for complexes 5-8, even with the naked eye, as indicated by quantum yield values of 0.087, 0.094, 0.051, and 0.021, respectively. Furthermore, in contrast to 5-nitro-8-hydroxyquinoline, the 5-chloro-8-hydroxyquinoline ligand exhibited bands at different energies depending on the coordinated, metal, which supported its potential application in ionic and biological probes, as well as in cell imaging. (C) 2016 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 10/16830-4 - Improvement of calixarenes and their use as molecular materials
• Grantee: Izilda Aparecida Bagatin
• Support Opportunities: Regular Research Grants