37 This shows a clear trend for the ligands that the lowest energy absorption is shifted toward higher wavelengths within the series of methyl ( 2 ), tert ‐butyl ( 3 ), and methoxy ( 4 ) substitution, which is consistent with the variation of the electronic properties of para substituents and also reflects the trend observed for the standard potentials (cf.
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Metal-Bonded Redox-Active Triarylamines and Their Interactions: Synthesis, Structure, and Redox Properties of Paddle-Wheel Copper Complexes.
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