A Copper Porphyrin for Sensing H₂S in Aqueous Solution via a “Coordinative‐Based” Approach

Abstract

A "turn on" fluorescence-based probe for sensing H 2 S in water via a coordinative-based approach has been successfully devised. The probe can selectively detect H 2 S in aqueous solutions over other anions, biothiols, and common

A Cyclam‐Based Fluorescent Ligand as a Molecular Beacon for Cu2+ and H2S Detection

“…In contrast, when exciting a solution of py‐cyclam‐pyr‐Cu at the same wavelength, an immediate and visible quenching of the py‐cyclam‐pyr fluorescence is registered (see Figure ). Most likely, the quenching is due to the coordination of paramagnetic Cu 2+ to the free ligand, as already reported for different copper complexes , , , , , , , . The fluorescence intensity of the resulting py‐cyclam‐pyr‐Cu system remained stable for a week, thus suggesting stability of the construct over this period.…”

“…The majority of the copper complexes reported in the literature as H 2 S sensors harness the displacement of the metal from the fluorophores' environment to generally produce fluorescence turn‐on changes by the H 2 S‐mediated precipitation of metal sulfides , , , , , , . In contrast, in 2015, our research group reported a simple copper porphyrin complex as a “turn‐on” fluorescent probe for the detection of H 2 S in aqueous media, in which the sensing mechanism was based on binding HS – to the copper center …”

“…Thus, implementation of H 2 S fluorescence‐based probes is still considered a very challenging task, and it has attracted much attention from several research groups in the world . Our studies on the implementation of devices for monitoring H 2 S started some time ago and focused both on properly tailored low‐molecular‐mass compounds and on natural metalloproteins …”

Plasmon‐Enhanced Fluorescence‐Based Core–Shell Gold Nanorods as a Near‐IR Fluorescent Turn‐On Sensor for the Highly Sensitive Detection of Pyrophosphate in Aqueous Solution

“…TCPP as fluorescence emitter is covalently attached to the AuNR surface with controllable silica shell thickness, resulting in the significant enhancement of fluorescence intensity via plasmon–exciton coupling. Cu 2+ is a well‐known highly efficient fluorescent quencher due to its paramagnetic properties via electron or energy transfer, and as a result the copper porphyrin (TCPP‐Cu 2+ ) has a weak fluorescence . Upon the introduction of PPi, the strong affinity between Cu 2+ and PPi can promote the disassembly of the turn‐off state of TCPP‐Cu 2+ complexes, and the process can be observed by monitoring the fluorescence recovery of TCPP (Scheme B).…”

Electrochemistry of nonplanar copper(ii) tetrabutano- and tetrabenzotetraarylporphyrins in nonaqueous media

“…1,2 Additional metal-centered reactions may also be observed for porphyrins with transition metal ions, the most studied of which have been the M II /M III processes involving porphyrins with Fe, Co, Ni or Mn centers. 1,2,[13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] Our recent report of a Cu II /Cu III porphyrin oxidation involved highly substituted nonplanar compounds 12 and we wished to know how changing the planarity or p-ring system of the porphyrin macrocycle by addition of four b,b 0fused butano or benzo groups might affect the redox potentials and electron transfer mechanisms of these copper(II) porphyrins. 1,2 A number of meso and/or b-substituted copper porphyrins have been synthesized and characterized as to their spectroscopic properties and electrochemistry 1,2,12,13 and these synthetic copper porphyrins have been the subject of numerous investigations.…”