Search results for: Hyotcherl Ihee

Items from 1 to 20 out of 48 results

article

Photoinduced Group Transposition via Iridium‐Nitrenoid Leading to Amidative Inner‐Sphere Aryl Migration

Hoimin Jung, Jungkweon Choi, Daniel Kim, Jeong Hoon Lee, more

Angewandte Chemie International Edition > 63 > 36 > n/a - n/a

We herein report a fundamental mechanistic investigation into photochemical metal‐nitrenoid generation and inner‐sphere transposition reactivity using organometallic photoprecursors. By designing Cp*Ir(hydroxamate)(Ar) complexes, we induced photo‐initiated ligand activation, allowing us to explore the amidative σ(Ir–aryl) migration reactivity. A combination of experimental mechanistic studies, femtosecond...

article

Photoinduced Group Transposition via Iridium‐Nitrenoid Leading to Amidative Inner‐Sphere Aryl Migration

Hoimin Jung, Jungkweon Choi, Daniel Kim, Jeong Hoon Lee, more

Angewandte Chemie > 136 > 36 > n/a - n/a

article

Estimating signal and noise of time‐resolved X‐ray solution scattering data at synchrotrons and XFELs

Jungmin Kim, Jong Goo Kim, Hosung Ki, Chi Woo Ahn, more

Journal of Synchrotron Radiation > 27 > 3 > 633 - 645

Elucidating the structural dynamics of small molecules and proteins in the liquid solution phase is essential to ensure a fundamental understanding of their reaction mechanisms. In this regard, time‐resolved X‐ray solution scattering (TRXSS), also known as time‐resolved X‐ray liquidography (TRXL), has been established as a powerful technique for obtaining the structural information of reaction intermediates...

article

Proton Transfer Accompanied by the Oxidation of Adenosine

Jungkweon Choi, Sachiko Tojo, Doo‐Sik Ahn, Mamoru Fujitsuka, more

Chemistry – A European Journal > 25 > 32 > 7711 - 7718

Despite numerous experimental and theoretical studies, the proton transfer accompanying the oxidation of 2′‐deoxyadenosine 5′‐monophosphate 2’‐deoxyadenosine 5’‐monophosphate (5’‐dAMP, A) is still under debate. To address this issue, we have investigated the oxidation of A in acidic and neutral solutions by using transient absorption (TA) and time‐resolved resonance Raman (TR³) spectroscopic methods...

article

Formation of the Charge‐Localized Dimer Radical Cation of 2‐Ethyl‐9,10‐dimethoxyanthracene in Solution Phase

Jungkweon Choi, Doo‐Sik Ahn, Mamoru Fujitsuka, Sachiko Tojo, more

Chemistry – A European Journal > 25 > 21 > 5586 - 5594

Although dimer radical ions of aromatic molecules in the liquid‐solution phase have been intensely studied, the understanding of charge‐localized dimers, in which the extra charge is localized in a single monomer unit instead of being shared between two monomer units, is still elusive. In this study, the formation of a charge‐localized dimer radical cation of 2‐ethyl‐9,10‐dimethoxyanthracene (DMA),...

article

Kinetics of the E46Q mutant of photoactive yellow protein investigated by transient grating spectroscopy

Cheolhee Yang, Tae Wu Kim, Youngmin Kim, Jungkweon Choi, more

Chemical Physics Letters > 2017 > 683 > C > 262-267

To elucidate the role of internal proton transfer in the photodynamics of photoactive yellow protein (PYP), the photocycle of the Glu46Gln mutant of PYP (E46Q-PYP) is investigated by transient grating (TG) spectroscopy. Compared with wild-type PYP (wt-PYP), the first spectrally blue-shifted intermediate of E46Q-PYP is formed more slowly, which is consistent with the absence of direct protonation from...

chapter

Capturing Transient Solute Structures in Solution by Pulsed X-ray Diffraction

Jae Hyuk Lee, Tae Kyu Kim, Joonghan Kim, Qingyu Kong, more

Springer Series in Chemical Physics > Ultrafast Phenomena XVI > Ultrafast X-ray and Electron Science > 131-133

The structural kinetics of photo-induced elimination reaction of 1,2-diiodotetrafluoroethane in solution is examined by transient X-ray diffraction. The structure of .CF²CF²I is determined to be a classical mixture of anti and gauche forms and their decay mechanism is also tracked in real time.

article

A Photoresponsive Smart Covalent Organic Framework

Ning Huang, Xuesong Ding, Jangbae Kim, Hyotcherl Ihee, more

Angewandte Chemie > 127 > 30 > 8828 - 8831

Ordered π‐columnar structures found in covalent organic frameworks (COFs) render them attractive as smart materials. However, external‐stimuli‐responsive COFs have not been explored. Here we report the design and synthesis of a photoresponsive COF with anthracene units as the photoresponsive π‐building blocks. The COF is switchable upon photoirradiation to yield a concavo‐convex polygon skeleton through...

article

A Photoresponsive Smart Covalent Organic Framework

Ning Huang, Xuesong Ding, Jangbae Kim, Hyotcherl Ihee, more

Angewandte Chemie International Edition > 54 > 30 > 8704 - 8707

article

Sub-100-ps structural dynamics of horse heart myoglobin probed by time-resolved X-ray solution scattering

Key Young Oang, Kyung Hwan Kim, Junbeom Jo, Youngmin Kim, more

Chemical Physics > 2014 > 442 > C > 137-142

Here we report sub-100-ps structural dynamics of horse heart myoglobin revealed by time-resolved X-ray solution scattering. By applying the time-slicing scheme to the measurement and subsequent deconvolution, we investigate the protein structural dynamics that occur faster than the X-ray temporal pulse width of synchrotrons (∼100ps). The singular value decomposition analysis of the experimental data...

article

Random‐Graft Polymer‐Directed Synthesis of Inorganic Mesostructures with Ultrathin Frameworks

Changbum Jo, Yongbeom Seo, Kanghee Cho, Jaeheon Kim, more

Angewandte Chemie > 126 > 20 > 5217 - 5221

A widely employed route for synthesizing mesostructured materials is the use of surfactant micelles or amphiphilic block copolymers as structure‐directing agents. A versatile synthesis method is described for mesostructured materials composed of ultrathin inorganic frameworks using amorphous linear‐chain polymers functionalized with a random distribution of side groups that can participate in inorganic...

article

Random‐Graft Polymer‐Directed Synthesis of Inorganic Mesostructures with Ultrathin Frameworks

Changbum Jo, Yongbeom Seo, Kanghee Cho, Jaeheon Kim, more

Angewandte Chemie International Edition > 53 > 20 > 5117 - 5121

article

Theoretical study on the reaction of butadiynyl radical (C₄H) with ethylene (C₂H₄) to form C₆H₄ and H

Joonghan Kim, Hyotcherl Ihee

International Journal of Quantum Chemistry > 112 > 8 > 1913 - 1925

The reaction mechanisms of the butadiynyl radical (C₄H) with ethylene (C₂H₄) to form H and C₆H₄ via hydrogen elimination are investigated using the density functional theory and high‐level ab initio methods. The calculated geometrical parameters and dipole moment of the ²Π state of C₄H are in excellent agreement with previously reported values using CCSD(T) with large basis sets. The calculated reaction...

article

The Short-Lived Signaling State of the Photoactive Yellow Protein Photoreceptor Revealed by Combined Structural Probes

Pradeep L. Ramachandran, Janet E. Lovett, Patrick J. Carl, Marco Cammarata, more

Journal of the American Chemical Society > 2011 > 133 > 24 > 9395 - 9404

article

Protein Folding Dynamics of Cytochrome c Seen by Transient Grating and Transient Absorption Spectroscopies

Jungkweon Choi, Cheolhee Yang, Jeongho Kim, Hyotcherl Ihee

The Journal of Physical Chemistry B > 2011 > 115 > 12 > 3127 - 3135

article

Anisotropic Picosecond X-ray Solution Scattering from Photoselectively Aligned Protein Molecules

Jeongho Kim, Kyung Hwan Kim, Jong Goo Kim, Tae Wu Kim, more

The Journal of Physical Chemistry Letters > 2011 > 2 > 5 > 350 - 356

article

Density Functional and Spin−Orbit Ab Initio Study of CF ₃ Br: Molecular Properties and Electronic Curve Crossing

Joonghan Kim, Tae Kyu Kim, Hyotcherl Ihee

The Journal of Physical Chemistry A > 2011 > 115 > 7 > 1264 - 1271

article

Self‐Assembly of Semiconducting Photoluminescent Peptide Nanowires in the Vapor Phase

Joon Seok Lee, Ilsun Yoon, Jangbae Kim, Hyotcherl Ihee, more

Angewandte Chemie > 123 > 5 > 1196 - 1199

Ganz schön drahtig: Ein einfacher Gasphasenprozess mit linearem Diphenylalanin als Ausgangsmaterial resultiert in der selbstorganisierten Bildung von Cyclodipeptid‐Nanodrähten mit orthorhombischer Symmetrie. Diese einkristallinen Nanodrähte zeigen eine starke blaue Lumineszenz um 465 nm und Halbleiterverhalten (siehe Bild).

article

Self‐Assembly of Semiconducting Photoluminescent Peptide Nanowires in the Vapor Phase

Joon Seok Lee, Ilsun Yoon, Jangbae Kim, Hyotcherl Ihee, more

Angewandte Chemie International Edition > 50 > 5 > 1164 - 1167

Down to the wire: A simple vapor‐transport process using linear diphenylalanine as the starting material has resulted in the self‐assembly of cyclodipeptide nanowires with an orthorhombic symmetry. Furthermore, the single‐crystalline nanowires exhibit a strong blue luminescence centered at 465 nm and possess semiconducting properties (see picture).

article

Spin–orbit ab initio study of two low-lying states of chloroiodomethane cation

Joonghan Kim, Hyotcherl Ihee, Yoon Sup Lee

Theoretical Chemistry Accounts > 2011 > 129 > 3-5 > 343-347

Spin–orbit coupling plays a crucial role in the determination of molecular structure and calculation of vibrational frequencies of CH₂ClI⁺. We performed the geometry optimizations and vibrational frequency calculations of both the lower and upper spin–orbit (SO) states using an ab initio SO method based on multiconfigurational wave function. The multistate complete active space perturbation theory...

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INFONA - science communication portal

Search results for: Hyotcherl Ihee

Photoinduced Group Transposition via Iridium‐Nitrenoid Leading to Amidative Inner‐Sphere Aryl Migration

Photoinduced Group Transposition via Iridium‐Nitrenoid Leading to Amidative Inner‐Sphere Aryl Migration

Estimating signal and noise of time‐resolved X‐ray solution scattering data at synchrotrons and XFELs

Proton Transfer Accompanied by the Oxidation of Adenosine

Formation of the Charge‐Localized Dimer Radical Cation of 2‐Ethyl‐9,10‐dimethoxyanthracene in Solution Phase

Kinetics of the E46Q mutant of photoactive yellow protein investigated by transient grating spectroscopy

Capturing Transient Solute Structures in Solution by Pulsed X-ray Diffraction

A Photoresponsive Smart Covalent Organic Framework

A Photoresponsive Smart Covalent Organic Framework

Sub-100-ps structural dynamics of horse heart myoglobin probed by time-resolved X-ray solution scattering

Random‐Graft Polymer‐Directed Synthesis of Inorganic Mesostructures with Ultrathin Frameworks

Random‐Graft Polymer‐Directed Synthesis of Inorganic Mesostructures with Ultrathin Frameworks

Theoretical study on the reaction of butadiynyl radical (C₄H) with ethylene (C₂H₄) to form C₆H₄ and H

The Short-Lived Signaling State of the Photoactive Yellow Protein Photoreceptor Revealed by Combined Structural Probes

Protein Folding Dynamics of Cytochrome c Seen by Transient Grating and Transient Absorption Spectroscopies

Anisotropic Picosecond X-ray Solution Scattering from Photoselectively Aligned Protein Molecules

Density Functional and Spin−Orbit Ab Initio Study of CF ₃ Br: Molecular Properties and Electronic Curve Crossing

Self‐Assembly of Semiconducting Photoluminescent Peptide Nanowires in the Vapor Phase

Self‐Assembly of Semiconducting Photoluminescent Peptide Nanowires in the Vapor Phase

Spin–orbit ab initio study of two low-lying states of chloroiodomethane cation

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