Schiff Bases and Multidentate Organic Compounds as Fluorescent Sensors of Al³⁺: Photophysical, Fluorescent Bioimaging and the Mechanisms

Abstract

This work is dedicated to Prof. Angelina Flores-Parra as recognition of her scientific contribution on main group chemistry.

Coordination-Driven Salamo-Salen-Salamo-Type Multinuclear Transition Metal(II) Complexes: Synthesis, Structure, Luminescence, Transformation of Configuration, and Nuclearity Induced by the Acetylacetone Anion

“…In the case of complex 1 , the band at 298.87 nm arises from the π → π* and n → π* transitions due to H + 15 to L + 34 excitation (S 0 → S 149 , 12.72%), the absorption at 312.25 nm predominantly contributed by the transition from the H + 18 to L + 20 excitation (S 0 → S 136 , 11.29%), the band at 341.89 nm arises from the π → π* and n → π* transitions due to H + 10 to L + 25 excitation (S 0 → S 116 , 5.93%), the band at 355.20 nm arises from the π → π* and n → π* transitions due to H + 15 to L + 32 excitation (S 0 → S 105 , 4.34%), and the band at 390.42 nm is due to H + 19 to L + 36 excitation (S 0 → S 90 , 13.80%) (Figure ). − As stated previously, the TD-DFT calculated theoretical bands agree well with the experimental value.…”