Search Results - "Liu, Robert S. H"

Reflection on Medium Effects on Photochemical Reactivity by Liu, Robert S. H, Hammond, George S

“…In reexamining medium effects on photochemical reactions, we have emphasized those on unequilibrated excited species such as the Franck−Condon species. Despite…”
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New Aspects of Diphenylbutadiene Photochemistry. Regiospecific Hula-Twist Photoisomerization by Yang, Lan-ying, Liu, Robert S. H, Boarman, Kelly J, Wendt, Natalie L, Liu, Jin

“…In EPA glass at liquid nitrogen temperature, the E,E isomer of diphenylbutadiene (DPB) was photostable, while both the Z,E and Z,Z isomers underwent selective…”
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Photoisomerization by Hula-Twist:  A Fundamental Supramolecular Photochemical Reaction by Liu, Robert S. H

“…The volume-conserving hula-twist cis/trans isomerization process has been incorporated in a general scheme for photoisomerization of polyenes, applicable to…”
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Nature of Supramolecular Complexes Controlled by the Structure of the Guest Molecules: Formation of Octa Acid Based Capsuleplex and Cavitandplex by Jayaraj, Nithyanandhan, Zhao, Yaopeng, Parthasarathy, Anand, Porel, Mintu, Liu, Robert S. H, Ramamurthy, V

“…Factors that govern inclusion of organic molecules within octa acid (OA), a synthetic deep cavity cavitand, have been delineated by examining the complexation…”
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Fluorinated Retinoids and Carotenoids by Liu, Robert S. H, Liu, Jin

“…Methods of preparing fluorinated retinoids with labels located on odd-numbered carbons as well on even-numbered carbons and those containing trifluoromethyl…”
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The Case of Medium-Dependent Dual Mechanisms for Photoisomerization: One-Bond-Flip and Hula-Twist by Robert S. H. Liu, Hammond, George S.

“…This paper critically reviews examples in the literature of photochemical cis-trans isomerization paying particular attention to the medium effect and…”
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Possible Role of the 11-cis-Retinyl Conformation in Controlling the Dual Decay Processes of Excited Rhodopsin by Robert S. H. Liu, Hammond, George S., Mirzadegan, Taraneh, Turro, Nicholas J.

“…In this work, we examine how the reported dual decay processes of rhodopsin and binding site stereospecificity can be accounted for by the recently available…”
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Mechanisms of Photoisomerization of Polyenes in Confined Media: From Organic Glasses to Protein Binding Cavities by Liu, Robert S. H., Yang, Lan-Ying, Liu, Jin

“…Photochemical reactivities of model organic systems (stilbene and diphenylbutadiene) in organic glasses were first examined and compared with those in solution…”
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Orbital Control of the Color and Excited State Properties of Formylated and Fluorinated Derivatives of Azulene by Shevyakov, Sergey V, Li, Hongru, Muthyala, Rajeev, Asato, Alfred E, Croney, John C, Jameson, David M, Liu, Robert S. H

“…New azulene derivatives containing resonantly electron withdrawing formyl and resonantly electron donating fluorine substituents on the seven- as well as the…”
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Photochemical reactivity of polyenes: from dienes to rhodopsin, from microseconds to femtoseconds by Liu, Robert S H, Hammond, George S

“…In reviewing the photochemistry of polyenes (from dienes and trienes to the visual retinyl chromophore), we categorize condensed-phase photochemical reactivity…”
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Colorful Azulene and Its Equally Colorful Derivatives by Liu, Robert S. H

“…A simple pictorial method using HOMO, LUMO, and LUMO+1 of azulene coupled with interaction between the electrons in the singly occupied orbitals is introduced…”
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The Role of Organic Glasses in cis/trans Photoisomerization at Low Temperatures by Zhao, Yao-Peng, Yang, Lan-Ying, Simmons, Charles J., Liu, Robert S. H.

“…Into the looking glass! Low temperature photoisomerization studies on some arenes have been studied in different organic glasses. The results are consistent…”
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The Molecular Basis for the High Photosensitivity of Rhodopsin by Robert S. H. Liu, Colmenares, Leticia U.

“…Based on structural information derived from the F NMR data of labeled rhodopsins, rhodopsin crystal structure, and excited-state properties of model polyenes,…”
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Introduction to the Symposium-in-print: Photoisomerization Pathways, Torsional Relaxation and the Hula Twist by Liu, Robert S. H.

“…A review of recent literature on volume-conserving cis–trans photoisomerization reaction mechanism, including hula twist, is presented. Differences between…”
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Steric Effects in Hula-Twist Photoisomerization. 1,4-Dimethyl- and 2,3-Dimethyl-1,4-diphenylbutadienes by Yang, Lan-ying, Liu, Robert S. H, Wendt, Natalie L, Liu, Jin

“…1,4-Dimethyl-1,4-diphenylbutadiene was shown to be able to execute regiospecific HT-1 photoisomerization around a methyl group when irradiated in a…”
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Control of the Photophysical Properties of Polyatomic Molecules by Substitution and Solvation:  The Second Excited Singlet State of Azulene by Tétreault, Nicolas, Muthyala, Rajeev S, Liu, Robert S. H, Steer, Ronald P

“…The UV−visible−near-IR absorption spectra, S2 → S0 fluorescence quantum yields and S2 fluorescence lifetimes of 1-fluoroazulene, 1,3-difluoroazulene, and…”
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Correlation of Substituent Effects and Energy Levels of the Two Lowest Excited States of the Azulenic Chromophore by Liu, Robert S. H, Muthyala, Rajeev S, Wang, Xue-song, Asato, Alfred E, Wang, Peng, Ye, Cheng

“…Experimental and calculated data show that the relative energy levels of the two lowest excited states of azulene are sensitive to the nature and position of…”
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"You're Repulsive!"—Teaching VSEPR in a Not-So-Elegant Way by Liu, Robert S. H

“…Valence shell electron pair repulsive (VSEPR) interaction is an important concept particularly in discussing structural properties of molecules. In this…”
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Study of α-Crustacyanin Utilizing Halogenated Canthaxanthins by Liu, Jin, Shelton, Nicole L, Liu, Robert S. H

“…The preparations and spectroscopic characteristics of five all-trans halogenated canthaxanthins are described in this letter. The air/light-sensitive…”
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The Use of Prochiral Centers for Demonstrating Asymmetric Stacking in Aggregates of Azulenylazulenium Cyanine Dyes by Asato, Alfred E, Watanabe, Dana T, Liu, Robert S. H

“…The diastereotopic methyl signals detected at low temperatures or high concentrations of an azulenylazulenium salt containing prochiral centers are consistent…”
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