Article
Chemistry, Multidisciplinary
Ke Liu, Jing Zhang, Qiyuan Shi, Liping Ding, Taihong Liu, Yu Fang
Summary: This study reports a new strategy for tuning excited-state intramolecular proton transfer (ESIPT) by incorporating an excited-state intramolecular charge transfer (ESICT) process. Three o-carborane derivatives were designed to selectively detect mustard gas simulant using film-based fluorescence sensing. This work provides a reliable strategy for creating high-performance sensing fluorophores via ESIPT manipulation.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Jiayu Li, Sirui Yang, Ziqi Deng, Amjad Islam, Shiqi Wu, Jiaxing He, Shaofei Ni, Li Dang, Ming-De Li
Summary: Photofunctional materials based on donor-acceptor molecules have unique optical properties and have attracted significant attention. This study investigates the effect of substitution positions on the excited-state evolution channels of donor-acceptor molecules by designing different regioisomeric dyads.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Applied
Catia I. C. Esteves, Luis F. B. Fontes, A. Filipa N. Borges, Joao Rocha, Artur M. S. Silva, Samuel Guieu
Summary: It is discovered that 2'-aminochalcones with a strong push-pull character exhibit dual emission due to the Excited State Intramolecular Proton Transfer (ESIPT) between ketoenamine and enol-imine tautomers. The strength of hydrogen bonds is correlated with the tautomerization energy gap, depending on the electron donating or electron withdrawing group on the amine.
Article
Chemistry, Multidisciplinary
Mirco Natali, Agnese Amati, Nicola Demitri, Elisabetta Iengo
Summary: Aromatic amino acids such as l-tyrosine and l-tryptophan play a role in mediating electron transfer reactions in natural systems. This study prepared and characterized two novel conjugates based on porphyrin chromophores and l-tryptophan as electron/proton donor. Photophysical investigation showed different quenching mechanisms operating upon visible-light excitation, highlighting the unique role of l-tryptophan in proton-coupled electron transfer.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Physical
Xiao Luo, Wei Shi, Yunfan Yang, Yongqing Li
Summary: The study introduced a new fluorescence probe HMBT-LW, successfully detecting O-2(center dot)- ions in living organisms and exploring its excited intramolecular proton transfer mechanism. The experimental results indicated that the emitted fluorescence originated from the isomer structure of HMBT.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Multidisciplinary
Martin L. Kirk, David A. Shultz, Patrick Hewitt, Daniel E. Stasiw, Ju Chen, Art van der Est
Summary: A change in the ground-state electron spin polarization (ESP) was reported in complexes where an organic radical is attached to a donor-acceptor chromophore via different meta-phenylene bridges. Photoexcitation of these molecules with visible light generates emissive or absorptive ground-state ESP, depending on the specific molecular structure.
Review
Chemistry, Multidisciplinary
Ismael A. Heisler, Stephen R. Meech
Summary: Studying chemical reactions in confined media requires consideration of the confinement effect on reaction rate, as well as the understanding of interactions between reactants and confining medium. Ultrafast spectroscopy can be used to measure reaction dynamics, revealing differences in reaction kinetics within the nanoconfined water phase of reverse micelles.
CHEMICAL SOCIETY REVIEWS
(2021)
Article
Chemistry, Multidisciplinary
Tomokazu Umeyama, Daizu Mizutani, Yuki Ikeda, W. Ryan Osterloh, Futa Yamamoto, Kosaku Kato, Akira Yamakata, Masahiro Higashi, Takumi Urakami, Hirofumi Sato, Hiroshi Imahori
Summary: We have achieved a long-lived and highly emissive charge-transfer excited state between an organic conjugated molecule and a two-dimensional semiconducting inorganic nanosheet by precisely designing the bridge structure. This research is of great significance for energy conversion, optoelectronic devices, and sensors.
Article
Chemistry, Physical
Jiaji Zhang, Raffaele Borrelli, Yoshitaka Tanimura
Summary: In this study, a detailed theoretical model of photo-induced proton-coupled electron transfer (PPCET) processes was developed to analyze the dynamics and efficiency of the reaction. By employing hierarchical equations of motion, the quantum dynamics of the PPCET process under an interaction with a non-Markovian environment was studied, providing insights into the transition pathways through transient absorption spectroscopy (TAS) and two-dimensional resonant electronic-vibrational spectroscopy (2DREVS) signals.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Chemistry, Physical
Adam Srut, Vera Krewald
Summary: In this study, transient absorption spectroscopy and excited state dynamics simulations were used to investigate the electronic and vibrational evolution of a mixed-valent excited state in the reduced form of the Creutz-Taube ion. The results revealed a series of excited states with weak metal-metal interaction, which dominated the electronic population at short time scales. A long-lived vibrational wave packet mainly confined to oscillations of the metal center-bridge distances was observed.
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Article
Chemistry, Physical
Yan Guo, Xuyang Li, Jiani Ma, David Lee Phillips
Summary: Experimental and theoretical investigations were conducted to study the formation mechanisms of quinone methides (QMs) from 4-(2-hydroxyphenyl)pyridine. The results showed that the solvent environment played a critical role in influencing the pathways of QM formation, with water molecules facilitating the generation of QMs in ACN-H2O.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Physical
Jiawen Fang, Ping Li, Xudong Xue, Hui Li, Dongyue Cui, Jingyu Zhang, Yang Wang, Tushar Debnath, Yanni Jie, Wei Huang, Runfeng Chen
Summary: Aggregation significantly affects the organic room-temperature phosphorescence (RTP), especially in molecules with D-A architectures, but the underlying mechanism is not yet well understood. By constructing different D-A aggregates in solid films, the fluorescence and phosphorescence from the locally excited and intramolecular charge-transfer states can be modulated. The dihedral angle between D and A units is found to control the electronic communication, resulting in enhanced D-A coupling and reduced ICT at shrinking angles, leading to energy realignment and promoting RTP from the molecular aggregates.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Martin L. Kirk, David A. Shultz, Patrick Hewitt, Ju Chen, Art van der Est
Summary: Photoinduced electron spin polarization (ESP) in the ground state of luminescent materials is investigated, and the phenomenon is found to be influenced by the connecting structure and have a relatively long duration.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Physical
Joseph S. Beckwith, Haw Yang
Summary: Determining the 3D orientation of a single molecule or particle using division-of-amplitude polarimetry involves splitting emitted/scattered light into multiple polarizations and measuring light intensity. Cramer-Rao lower bounds are derived for this method, showing different information contents for photons in scattering and fluorescence cases. The study provides guidelines for experimental design and interpretation in the future.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Optics
Guijie Zhao, Yunfan Yang, Chengyuan Zhang, Yuzhi Song, Yongqing Li
Summary: This study investigates the excited-state intramolecular proton transfer (ESIPT) reaction mechanism of a novel chromophore BTS using density functional theory (DFT) and time-dependent density functional theory (TD-DFT) methods. The research shows that the intramolecular hydrogen bonding is enhanced under the excited state, providing driving force for the ESIPT process.
JOURNAL OF LUMINESCENCE
(2021)
