Related Experiment Video
Updated: Sep 1, 2025
07:11
ARL Spectral Fitting as an Application to Augment Spectral Data via Franck-Condon Lineshape Analysis and Color Analysis
Published on: August 19, 2021
2.6K
NIR-emissive, singlet-oxygen-sensitizing gold tetra(thiocyano)corroles.
Kasturi Sahu1,2, Sara Angeloni3, Jeanet Conradie4,5
1School of Chemical Sciences, National Institute of Science Education and Research (NISER), Bhubaneswar - 752050, India.
Dalton Transactions (Cambridge, England : 2003)
|August 15, 2022
Summary
New gold tetrathiocyanocorroles exhibit near-infrared (NIR) emission and singlet oxygen sensitization. These 5d-metallocorroles show potential for applications in oxygen sensing and photodynamic therapy.
Area of Science:
- Inorganic Chemistry
- Materials Science
- Photochemistry
Background:
- Metallocorroles are a class of porphyrinoids with diverse applications.
- Near-infrared (NIR) emissive materials are crucial for advanced technologies.
- Gold complexes offer unique electronic and photophysical properties.
Purpose of the Study:
- To synthesize and characterize novel gold tetrathiocyanocorroles.
- To investigate the photophysical properties of these new compounds.
- To evaluate their potential as triplet photosensitizers.
Main Methods:
- Synthesis of gold tetrathiocyanocorroles.
- Electrochemical measurements (oxidation and reduction potentials).
- Spectroscopic analysis (absorption, emission spectra, quantum yields, lifetimes).
- Singlet oxygen sensitization studies.
Main Results:
- Two fully characterized gold tetrathiocyanocorroles were synthesized.
- The electron-withdrawing SCN groups upshifted oxidation and reduction potentials and reduced the HOMO-LUMO gap.
- The compounds exhibit NIR phosphorescence around 900 nm with a quantum yield of ~0.3% and lifetime of ~10 μs.
- Efficient singlet oxygen sensitization (quantum yield ~50%) was observed.
Conclusions:
- Gold tetrathiocyanocorroles represent a new class of NIR-emissive 5d-metallocorroles.
- These complexes demonstrate significant potential for applications in oxygen sensing and photodynamic therapy due to their photophysical properties and singlet oxygen generation.
More Related Videos
Related Concept Videos
01:26Thermal and Photochemical Electrocyclic Reactions: Overview
2.4K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.4K
01:26Photochemical Electrocyclic Reactions: Stereochemistry
1.9K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Selection Rules: Photochemical Activation
1.9K
01:20Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions
2.0K
Arenediazonium substitution reactions occur when the diazonium group is substituted by various functional groups such as halides, hydroxyl, nitrile, etc. For instance, arenediazonium salts react with copper(I) salts of chloride, bromide, or cyanide to form corresponding aryl chlorides, bromides, and nitriles. These reactions are named Sandmeyer reactions. Although the mechanism of this reaction is complicated, as illustrated in Figure 1, they are believed to progress via an aryl copper...
2.0K
01:17Thermal Electrocyclic Reactions: Stereochemistry
2.1K
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
2.1K
02:36Crown Ethers
5.4K
Crown ethers are cyclic polyethers that contain multiple oxygen atoms, usually arranged in a regular pattern. The first crown ether was synthesized by Charles Pederson while working at DuPont in 1967. For this work, Pedersen was co-awarded the 1987 Nobel Prize in Chemistry. Crown ethers are named using the formula x-crown-y, where x is the total number of atoms in the ring and y is the number of ether oxygen atoms. The term 'crown' refers to the crown-like shape that these ether...
5.4K
02:34Structural Isomerism
19.6K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
19.6K