6. Rehybridization of the Acceptor (RICT) 3908 7. Planarization of the Molecule (PICT) 3909 III. Fluorescence Spectroscopy 3909 A. Solvent Effects and the Model Compounds 3909 1. Solvent Effects on the Spectra 3909 2. Steric Effects and Model Compounds 3911 3. Bandwidths 3913 4. Isoemissive Points 3914 B. Dipole Moments 3915 C. Radiative Rates and Transition Moments 3916 1. Quantum Yields and Radiationless Deactivation Processes 3916

Structural Changes Accompanying Intramolecular Electron Transfer: Focus on Twisted Intramolecular Charge-Transfer States and Structures

Kohn-Sham Density Functional Theory: Predicting and Understanding Chemistry

Methionine oxidation by reactive oxygen species: reaction mechanisms and relevance to Alzheimer's disease

Ketyl radical and amino radical anions, valuable reactive intermediates for C-C bond-forming reactions, are accessible through a C=O/C=NR umpolung. However, their utilization in catalysis remains largely underdeveloped owing to the high reduction potential of carbonyl compounds and imines. In the context of photoredox catalysis, tertiary amines are commonly employed as sacrificial co-reducing agents. Herein, an additional role of the amine is proposed, in which it is essential for the organocatalytic substrate activation. The combination of photoredox catalysis and carbonyl/imine activation enables the reductive coupling of aldehydes, ketones, and imines under mild reaction conditions.

Photoredox-Catalyzed Reductive Coupling of Aldehydes, Ketones, and Imines with Visible Light.

AIM dual parameter analysis is proposed for the better understanding of weak to strong interactions: Total electron energy densities (Hb(rc)) are plotted versus Laplacian of electron densities (Δρb(rc)) at bond critical points (BCPs). Interactions examined in this work are those in van der Waals adducts, hydrogen bonded complexes, molecular complexes and hypervalent adducts through charge transfer (CT) interactions, and some classical covalent bonds. Data calculated at BCPs for the optimized distances (ro), together with ro − 0.1 A, ro + 0.1 A, and ro + 0.2 A, are employed for the plots. The plots of Hb(rc) versus Δρb(rc) start from near origin (Hb(rc) = Δρb(rc) = 0) and turn to the right drawing a helical stream as a whole. The helical nature is demonstrated to be controlled by the relative magnitudes of kinetic energy densities (Gb(rc)) and potential energy densities (Vb(rc)), where Gb(rc) + Vb(rc) = Hb(rc). Requirements for the data to appear in the specified quadrant are clarified. Points correspondin...

Atoms-in-Molecules Dual Parameter Analysis of Weak to Strong Interactions: Behaviors of Electronic Energy Densities versus Laplacian of Electron Densities at Bond Critical Points

Klaus Dieter Asmus

Papers

Stabilization of oxidized sulfur centers in organic sulfides. Radical cations and odd-electron sulfur-sulfur bonds