Exact(5)
The free electron pair can also participate in resonance which will definitely improve the electron richness of the aromatic ring.
As the electron richness of π-spacer is increased, the absorption band and photocurrent density are enhanced in the order of the π-spacer capability.
Furthermore, we demonstrated that the occurrence of a photoinduced electron‐transfer process might cause a reduction in the quantum yield of Seoul‐Fluors with increasing electron richness of the R substituent.
Similar fluorescence‐quenching behavior, correlated with the electron richness of the R substituent, was also observed in three different solvents: methanol, acetonitrile, and dichloromethane (see Figure S1 in the Supporting Information).
This 75‐fold quantum‐yield reduction in S fBP can be rationalized by differences in the electron richness of the phosphate group (σp=0.0) and the phenoxide group (σp=−0.81) upon a specific chemical transformation of S fBP by DUSP3 (see Figure S2).
Similar(3)
(For example, the strength of the pyrazole proton interaction described above depends on the electron-richness of the pyrazole and on energetic penalties of rotation away from the energy minimum, phenomena requiring quantum mechanics level calculations for evaluation [92]).
In vitro assays with recombinant human PKCα showed that the number of the aromatic ring head groups as well as their electron-richness, are critical factors that determine potency.
In order to assess relative contribution of steric factors and electron-richness of phosphine ligands on biaryl-type scaffolds, a set of 1-aryl-pyrazole/pyrrole derived ligands L1 L6 featuring either aryldicyclohexylphosphino or aryldiphenylphosphino donor group was synthesized.
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