1
|
Jokazi M, Mpeta LS, Nyokong T. Electrocatalytic activity of manganese tetra 4-aminophenyl porphyrin in the presence of graphene quantum dots. J Electroanal Chem (Lausanne) 2021. [DOI: 10.1016/j.jelechem.2021.115748] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
2
|
The great performance of TiO2 nanotubes electrodes modified by copper(II)porphyrin in the reduction of carbon dioxide to alcohol. J CO2 UTIL 2020. [DOI: 10.1016/j.jcou.2020.101261] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
3
|
Wang L, Fang Y, Xu W, Ou Z, Kadish KM. Electrochemical and spectroelectrochemical characterization of Cu(II) and Mn(III) tetrabutano- and tetrabenzoporphyrins containing sterically hindered meso -(2,6-difluorophenyl) substituents in nonaqueous media. J PORPHYR PHTHALOCYA 2019. [DOI: 10.1142/s1088424619501013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Four tetrabutano and tetrabenzoporphyrins containing sterically hindered meso-(2,6-difluorophenyl) substituents and copper(II) or manganese(III) central metal ions were synthesized and characterized as to their electrochemical and spectroelectrochemical properties in nonaqueous media. The copper(II) derivatives exhibit the expected two one-electron reductions to give [Formula: see text]-anion radicals and dianions in CH2Cl2. Electrochemical and spectroelectrochemical data suggest that a Cu(II) phlorin anion is generated from the doubly reduced Cu(II) butanoporphyrin and it is this species which undergoes the third reduction in pyridine. The first one-electron reduction of the Mn(III) porphyrins is metal-centered to give a Mn(II) compound, while the second and third reductions are macrocycle-centered to give Mn(II) porphyrin [Formula: see text]-anion radicals and dianions in both CH2Cl2 and pyridine. A Mn(II) phlorin anion is also generated from the Mn(II) dianion on the spectroelectrochemical timescale under the given solution conditions. The [Formula: see text],[Formula: see text]-butano and benzo groups have a significant effect on the measured redox potentials. Steric hindrance of the meso-(2,6-difluorophenyl) substituents also has an effect on the potential separation between the first two oxidations of the benzoporphyrins.
Collapse
Affiliation(s)
- Liping Wang
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, P. R. China
- Department of Chemistry, University of Houston, Houston, Texas 77204-5003, USA
| | - Yuanyuan Fang
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, P. R. China
| | - Weijie Xu
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, P. R. China
| | - Zhongping Ou
- Department of Chemistry, University of Houston, Houston, Texas 77204-5003, USA
| | - Karl M. Kadish
- Department of Chemistry, University of Houston, Houston, Texas 77204-5003, USA
| |
Collapse
|
4
|
Fang Y, Wang L, Xu W, Ou Z, Chen M, Cong L, Shan W, Ke X, Kadish KM. Spectral, Electrochemical, and ESR Characterization of Manganese Tetraarylporphyrins Containing Four β,β'-Pyrrole Fused Butano and Benzo Groups in Nonaqueous Media. Inorg Chem 2019; 58:2576-2587. [PMID: 30721029 DOI: 10.1021/acs.inorgchem.8b03184] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Two series of β,β'-pyrrole butano- and benzo-substituted mangenese(III) tetraarylporphyrins were synthesized and characterized with regard to their spectral and electrochemical properties. The investigated compounds have the general formula butano(Ar)4PorMnCl and benzo(Ar)4PorMnCl, where Por is the dianion of the porphyrin and Ar is a p-CH3Ph, Ph or p-ClPh group on each of the four meso-positions of the macrocycle. Each manganese(III) butano- or benzoporphyrin was examined in CH2Cl2 and/or pyridine containing 0.1 M tetra- n-butylammonium perchlorate and the data then were compared to that of the parent tetraarylporphyrins having the same meso-substituents. Up to four reductions are observed for each compound, the first being metal-centered to generate a Mn(II) porphyrin, and the second and third being porphyrin ring-centered to give a Mn(II) porphyrin π-anion radical and dianion, respectively. The one-electron reduced manganese porphyrins have an ESR spectrum with signals at g⊥= 5.6-5.8 and g// = 2.0, indicating a mixture of the four- and five-coordinated Mn(II) complexes in a high-spin state (3d5, S = 5/2, I = 5/2). Data from cyclic voltammetry and spectroelectrochemistry both suggest that formation of the porphyrin dianion is followed by a chemical reaction at the electrode surface to give an electroactive phlorin anion. The effects of solvent and porphyrin substituents on ultraviolet-visible light (UV-vis) spectra, redox potentials, and electron transfer mechanisms are discussed.
Collapse
Affiliation(s)
- Yuanyuan Fang
- School of Chemistry and Chemical Engineering , Jiangsu University , Zhenjiang , 212013 , China
| | - Liping Wang
- School of Chemistry and Chemical Engineering , Jiangsu University , Zhenjiang , 212013 , China
| | - Weijie Xu
- School of Chemistry and Chemical Engineering , Jiangsu University , Zhenjiang , 212013 , China
| | - Zhongping Ou
- Department of Chemistry , University of Houston , Houston , Texas 77204-5003 , United States
| | - Mingyuan Chen
- School of Chemistry and Chemical Engineering , Jiangsu University , Zhenjiang , 212013 , China.,Department of Chemistry , University of Houston , Houston , Texas 77204-5003 , United States
| | - Lei Cong
- Department of Chemistry , University of Houston , Houston , Texas 77204-5003 , United States
| | - Wenqian Shan
- Department of Chemistry , University of Houston , Houston , Texas 77204-5003 , United States
| | - Xiangyi Ke
- Department of Chemistry , University of Houston , Houston , Texas 77204-5003 , United States
| | - Karl M Kadish
- Department of Chemistry , University of Houston , Houston , Texas 77204-5003 , United States
| |
Collapse
|
5
|
Xu N, Bevak AW, Armstrong BR, Powell DR. Synthesis, characterization and solid state molecular structures of five- and six-coordinate primary amide manganese porphyrin complexes. Polyhedron 2017. [DOI: 10.1016/j.poly.2016.10.022] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|