• Faza, Olalla Nieto
• Lippolis, Vito
• Caltagirone, Claudia
• Mameli, Marta
• Lodeiro, Carlos
• Capelo, Jose Luis

Abstract

<p>The optical response of four new anthracenylmethyl pendant-arm derivatives (L1-L4) of the macrocyclic ligands [12]aneNS₃, [12]aneNS ₂O, [15]aneNS₂O₂, and [12]aneN₂SO toward the metal ions Zn²⁺, Cd²⁺, Pb²⁺, Cu ²⁺, Hg²⁺, Ag⁺, Fe²⁺, Co ²⁺, Ni²⁺, Mn²⁺, Ca²⁺, Na ⁺, Mg²⁺, and K⁺ was investigated in 1:1 (v/v) MeCN/H₂O solutions. A strong chelation enhancement of quenching effect was observed on the fluorescent emission intensity of L2 as a consequence of the host-guest interaction with Hg²⁺ and the formation of a 1:2 metal-to-ligand complex. Density functional theory calculations confirmed the formation of a sandwich-type complex between L2 and Hg²⁺ as a favorable process. A matrix-assisted laser desorption/ionization (MALDI) time-of-flight mass spectrometry study using the four ligands as active MALDI probes was also performed. L1-L4 have also been explored as fluorescence chemosensors in microsamples using NANODROP technology.</p>

Topics

• density
• theory
• density functional theory
• matrix-assisted laser desorption–ionisation
• spectrometry
• quenching
• time-of-flight mass spectrometry