Unsymmetrical nonplanar ‘push–pull’ β-octasubstituted porphyrins: facile synthesis, structural, photophysical and electrochemical redox properties

2019 ◽  
Vol 48 (40) ◽  
pp. 15002-15011 ◽  
Author(s):  
Pinki Rathi ◽  
Ray Butcher ◽  
Muniappan Sankar
Keyword(s):  
Redox Properties ◽  
Spectral Features ◽  
Facile Synthesis ◽  
Electrochemical Redox ◽  
Homo Lumo

β-Octasubstituted porphyrins having three different substituents (Ph, Br and NO2) have been synthesized. They exhibited highly red-shifted absorption spectral features with tunable redox properties leading to a very low HOMO–LUMO gap as compared to MTPPs.

Synthesis, spectral and electrochemical redox properties of N-methyl fused nickel(II) porphyrin

2018 ◽  
Vol 22 (12) ◽  
pp. 1106-1110
Author(s):  
Tawseef Ahmad Dar ◽  
Mandeep ◽  
Muniappan Sankar
Keyword(s):  
Absorption Spectrum ◽  
Redox Properties ◽  
Spectral Features ◽  
Redox Potentials ◽  
Synthetic Route ◽  
Methyl Group ◽  
Excellent Yield ◽  
Electrochemical Redox ◽  
Ring Oxidation

[Formula: see text]-methyl fused nickel(II) porphyrin was synthesized by a facile synthetic route in excellent yield. The effect of the electron-donating methyl group on spectral and electrochemical redox properties was analyzed by comparing the electrochemistry with that of its precursors. [Formula: see text]-methylated fused nickel(II) porphyrin exhibited a red-shifted absorption spectrum ([Formula: see text] 6–13 nm) and a 180[Formula: see text]mV anodic shift in the first ring oxidation as well as a 210[Formula: see text]mV shift in reduction with respect to its Ni(II)-fused porphyrin precursor (Ni[Formula: see text]-(NH)TPP). However, the absorption spectral features and redox potentials of N-methyl fused nickel(II) porphyrin are marginally shifted as compared to its immediate precursor, [Formula: see text]-formyl Ni(II)-fused porphyrin. Notably, Ni(II)(N-CH[Formula: see text](CHO)TPP exhibited a third oxidation at 1.51[Formula: see text]mV, corresponding to oxidation of Ni(II) to Ni(III) due to the presence of “push–pull” [Formula: see text] substituents.

Facile Synthesis, Spectral, and Electrochemical Redox Properties of π-Extended ‘Push-Pull’ Corroles, Porphyrins and Chlorins

2021 ◽  
Vol MA2021-01 (16) ◽  
pp. 740-740
Author(s):  
Sandeep Kumar ◽  
Inderpal Yadav ◽  
Renu Kumari Rohal ◽  
Amir Sohel Bulbul ◽  
Muniappan Sankar
Keyword(s):  
Redox Properties ◽  
Facile Synthesis ◽  
Electrochemical Redox
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