N-Confused Porphyrin Immobilized on Solid Supports: Synthesis and Metal Ions Sensing Efficacy

Abstract

In this work, the N-confused porphyrin 5,10,15,20-tetraphenyl-2-aza-21-carbaporphyrin (NCTPP) was immobilized on neutral or cationic supports based on silica and on Merrifield resin. The new materials were characterized by appropriate techniques (UV-Vis spectroscopy, SEM, and zeta potential analysis). Piezoelectric quartz crystal gold electrodes were coated with the different hybrids and their ability to interact with heavy metals was evaluated. The preliminary results obtained showed that the new materials can be explored for metal cations detection and the modification of the material surface is a key factor in tuning the metal selectivity.

Nucleophilic Aromatic Substitution (SNAr) and Related Reactions of Porphyrinoids: Mechanistic and Regiochemical Aspects

“…[ 169 ] With one of the pyrrole rings inverted, i.e. bonding through one of the pyrrolic α and one of the β positions, they exhibit properties that are far different to more typical porphyrinoids; vastly red‐shifted UV‐Visible spectra, [ 170 ] the ability for intramolecular fusion, [ 171 ] differing metal coordination properties, [ 8c,172 ] and an exterior N that can be functionalized, [ 173 ] along with heightened reactivity at the C 3 ‐position, compared to porphyrins, which will be discussed vide infra. This core‐modified porphyrin was first reported by the groups of Furuta, [ 174 ] and Latos‐Grażyński.…”

Design of Multifunctional Fluorescent Hybrid Materials Based on SiO2 Materials and Core–Shell Fe3O4@SiO2 Nanoparticles for Metal Ion Sensing

“…On another hand, fluorescent chromophore 5‐methoxy‐2‐thiazoles (BTZ‐2) functionalized hybrid sensing probe MSNs‐BTZ‐2 was successfully prepared by Yan and co‐workers, and utilized for the selective detection of proton (H + ) and Cu 2+ in water at pH 7. Fluorescent material MSNs‐BTZ‐2 showed an intense emission band at 400 nm, which was drastically minimized in the presence of Cu 2+ attributed to the formation of a stable MSNs‐BTZ‐2‐Cu 2+ complex and paramagnetic nature of Cu 2+ ion . The calculated detection limit of MSNs‐BTZ‐2 towards Cu 2+ ions was 3.2 × 10 −6 m .…”

Acidochromic Behavior of Dibenzylidene Cyclohexanone-Based Bischalcone: Experimental and Theoretical Study

“… 17 , 18 These compounds can also be used in several optical devices including fluorescent-based DNA assays, photoalignment layer of liquid crystal display, and metal ions. 19 Therefore, it is a challenge to synthesize this lucrative-substituted bischalcone derivative in a solvent-free method with high yield, as well as its stability should be thoroughly checked. In this study, substituted dibenzylidine-cyclohexanone-based bischalcones were synthesized as shown in Scheme 1 .…”