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Full-Text Articles in Physical Sciences and Mathematics
Designing Conical Intersections For Light-Driven Single Molecule Rotary Motors: From Precessional To Axial Motion, Michael Filatov, Massimo Olivucci
Designing Conical Intersections For Light-Driven Single Molecule Rotary Motors: From Precessional To Axial Motion, Michael Filatov, Massimo Olivucci
Chemistry Faculty Publications
In the past, the design of light-driven single molecule rotary motors has been mainly guided by the modification of their ground-state conformational properties. Further progress in this field is thus likely to be achieved through a detailed understanding of light-induced dynamics of the system and the ways of modulating it by introducing chemical modifications. In the present theoretical work, the analysis of model organic chromophores and synthesized rotary motors is used for rationalizing the effect of electron-withdrawing heteroatoms (such as a cationic nitrogen) on the topography and branching plane of mechanistically relevant conical intersections. Such an analysis reveals how the …
Selective Anion Sensing By Chiral Macrocyclic Receptors With Multiple Hydrogen-Bonding Sites, Tadashi Ema, Keiichi Okuda, Sagiri Watanabe, Takayuki Yamasaki, Tsuyoshi Minami, Nina A. Esipenko, Pavel Anzenbacher Jr.
Selective Anion Sensing By Chiral Macrocyclic Receptors With Multiple Hydrogen-Bonding Sites, Tadashi Ema, Keiichi Okuda, Sagiri Watanabe, Takayuki Yamasaki, Tsuyoshi Minami, Nina A. Esipenko, Pavel Anzenbacher Jr.
Chemistry Faculty Publications
Chiral macrocycles featuring sulfonamide and/or amide groups as anion-binding sites were synthesized. X-ray crystal structures and DFT calculations have shown that they adopt different conformations that may lead to unique binding behavior. Indeed, various anions could be sensed by their colorimetric and/or fluorescence signal output. The chiral macrocycles showed chiral recognition for chiral anions. Furthermore, a multisensor array with two or four chiral receptors discriminated seven phosphate anions (AMP, ADP, ATP, CMP, GMP, Pi, and PPi) with 100% classification accuracy.
Enhanced Lifetime Of Excitons In Nonepitaxial Au/Cds Core/Shell Nanocrystals, Scott Lambright, Evgeniia Butaeva, Natalia Razgoniaeva, Thomas Hopkins, Bryan Smith, Dimuthu Perera, Jonathan Corbin, Elena Khon, Rebekah Thomas, Pavel Moroz, Andrey Mereshchenko, Alexander N. Tarnovsky, Mikhail Zamkov
Enhanced Lifetime Of Excitons In Nonepitaxial Au/Cds Core/Shell Nanocrystals, Scott Lambright, Evgeniia Butaeva, Natalia Razgoniaeva, Thomas Hopkins, Bryan Smith, Dimuthu Perera, Jonathan Corbin, Elena Khon, Rebekah Thomas, Pavel Moroz, Andrey Mereshchenko, Alexander N. Tarnovsky, Mikhail Zamkov
Chemistry Faculty Publications
The ability of metal nanoparticles to capture light through plasmon excitations offers an opportunity for enhancing the optical absorption of plasmon-coupled semiconductor materials via energy transfer. This process, however, requires that the semiconductor component is electrically insulated to prevent a "backward" charge flow into metal and interfacial states, which causes a premature dissociation of excitons. Here we demonstrate that such an energy exchange can be achieved on the nanoscale by using nonepitaxial Au/CdS core/shell nanocomposites. These materials are fabricated via a multistep cation exchange reaction, which decouples metal and semiconductor phases leading to fewer interfacial defects. Ultrafast transient absorption measurements …