Article
Biochemical Research Methods
Xinhuan Ma, Xinyao Wang, Shiqiang Cui, Shouzhi Pu
Summary: Developing fluorescence switching system is important in the fields of light-responsive materials or devices. This study successfully constructed a photo-controlled fluorescence switching system using photochromic diarylethene and trimethoxysilane modified zinc oxide quantum dots (Si-ZnO QDs). The system exhibited excellent photochromic property and fluorescence switching performance, with a modulation efficiency of 87.4% in solid state. These results provide new strategies for reversible solid-state photo-controlled fluorescence switching for applications in optical data storage and security labels.
JOURNAL OF FLUORESCENCE
(2023)
Article
Materials Science, Ceramics
Hailiang Huang, Tao Lin, Qi Fu, Lu Chen, Ke Chen, Qingyu Hou, Cong Li, Gehui Wen
Summary: Bulk Cr1_xMnxO2 samples were prepared using high pressure synthesis technology, and their crystal structure, magnetic properties, and electronic structure were investigated. The samples exhibited a rutile structure with space group P42/mnm, and the lattice parameter a remained unchanged while the lattice parameter c decreased with increasing Mn dopant content (x) and Metal-Metal bonding along the c-axis. The saturation magnetization of the samples decreased with increasing x. XPS analysis revealed electron transfer between Mn and Cr in Cr1-xMnxO2, with Mn existing as Mn2+ and Mn3+ ions and some Cr being oxidized to Cr6+. The calculated magnetic moment of Cr1-xMnxO2 was in accordance with the experimental data.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Multidisciplinary
Thomas Loan, Mithun Santra, Mark Bradley
Summary: Photo-switching compounds are widely used in various applications but the limited number of molecules exhibiting this phenomenon has restrained the field's advancement. Therefore, the discovery of new photo-switching compounds, including donor-acceptor Stenhouse adducts, is actively pursued. In this study, a novel class of photochromic molecules, phenylindole alkene dimers, is presented. These compounds exhibit photo-switching in the solid state and their optical properties can be tuned through synthesis. Surfaces coated with these photo-switches have potential applications as writable materials.
FRONTIERS IN CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Lei Zhang, Yawen Deng, Yubao Tang, Congxia Xie, Zhongtao Wu
Summary: This study presents a new strategy to design solid-state spiropyrans with highly efficient reversible photochromism at room temperature by increasing molecular flexibility. The developed T-type spiropyrans exhibit fast photoresponsive properties and can conveniently evolve into a new solid state with advanced photochromic and thermochromic properties. These solid-state spiropyrans show good room temperature stability and excellent correspondence between stimuli and colors, making them promising advanced information storage materials.
MATERIALS CHEMISTRY FRONTIERS
(2021)
Article
Chemistry, Applied
Xiao-Nan Li, Li Li, Zhi-Hui Wang, Gui-Hong Wu, Si-Qi Liu, Hong Zhang
Summary: Two novel isomeric Cd-viologen coordination polymers with the same empirical formula but different structures have been successfully assembled and characterized. One exhibits a 3D structure, while the other exhibits a 1D channel structure. The photochromic behaviors of the two compounds are different due to different electron transfer pathways.
Article
Agricultural Engineering
Heyu Zhang, Ji Fan, Wei Wang, Dan Yu
Summary: This study develops smart cotton fabrics with synchronous positive and negative photochromic and fluorescent color-changing properties, which can respond to both visible and ultraviolet light. Photochromic cotton fabrics have potential applications in various fields, such as UV protection, pattern switching, and information encryption.
INDUSTRIAL CROPS AND PRODUCTS
(2023)
Article
Chemistry, Multidisciplinary
Heyi Zhang, Fangyuan He, Xiaonan Li, Zhihui Wang, Hong Zhang
Summary: The novel one-dimensional chain structure multifunctional coordination polymer synthesized through self-assembly displays photochromism, thermochromism, and selective detection abilities for different types and sizes of amines.
NEW JOURNAL OF CHEMISTRY
(2021)
Article
Chemistry, Organic
Alexander Huber, Johannes Koch, Kevin Rudolph, Alexander Hoeing, Fabio Rizzo, Shirley K. Knauer, Jens Voskuhl
Summary: In this study, three deoxyestrone-based emissive lipofection agents were developed. These agents can emit light in both solution and solid-state due to the incorporation of a terephthalonitrile motif. Furthermore, by attaching tobramycin, these amphiphilic structures can form lipoplexes and enable gene transfection in HeLa and HEK 293T cells.
ORGANIC & BIOMOLECULAR CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Kristaps Sars, Meldra Kemere, Aleksejs Karzin, Igors Klimenkovs, Agris Berzins, Anatolijs Sarakovskis, Toms Rekis
Summary: Solid solutions with fine-tunable photoluminescence have been obtained by replacing different proportions of molecules in a 4-iodothioxanthone-4-chlorothioxanthone system. The luminescence spectra show a composition-dependent response, with a considerable change even at low proportions. The unique behavior of the newly obtained solid phases is demonstrated through a comparison with mechanical mixtures of pure components.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Chemistry, Multidisciplinary
Kazuhiro Yuhara, Kazuo Tanaka, Yoshiki Chujo
Summary: We demonstrate the design of dual-emission properties in crystals, which can switch luminescence processes based on temperature changes. The intensity ratios between the dual emissions are sensitive to temperature, making it suitable for ratiometric sensing systems.
MATERIALS CHEMISTRY FRONTIERS
(2022)
Article
Chemistry, Organic
Yiwei Zhang, Maggie Ng, Michael Ho-Yeung Chan, Nathan Man-Wai Wu, Lixin Wu, Vivian Wing-Wah Yam
Summary: A series of photochromic triethylene glycol-containing spiropyrans have been designed and synthesized, with their photophysical and photochromic properties modulated by varying the linker group. Solvent-induced ring-opening reactions were observed in THF-water mixtures, attributed to the stabilization of the merocyanine form in polar solvents. Interestingly, a slower thermal bleaching process of the open merocyanine form was observed in non-polar solvent media, possibly due to supramolecular self-assembly.
ORGANIC CHEMISTRY FRONTIERS
(2021)
Article
Chemistry, Physical
Johannes Maier, Tina Weller, Mukundan Thelakkat, Jurgen Koehler
Summary: Light-induced conversion of photochromic molecules has been intensively studied for various applications, showing high fatigue resistance and potential for super-resolution optical microscopy on frozen biological samples.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Biochemistry & Molecular Biology
Mengmeng Kang, Olayinka Oderinde, Xuelian Han, Guodong Fu, Zhihong Zhang
Summary: With the development of smart devices, there is a growing demand for stimuli-responsive materials. The oxidized hydroxyethyl cellulose-based hydrogel shows great potential in biomedical applications, with unique mechanical properties and photo/pH sensitivity.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
Article
Chemistry, Multidisciplinary
Yufeng Xie, Zhiqiang Wang, Dan Wang, Yunbing Zhou, Yunxiang Lei, Wenxia Gao, Miaochang Liu, Xiaobo Huang, Huayue Wu
Summary: Novel 4H-pyran derivatives were designed and synthesized, in which the strong pi-conjugation effect of the benzofuran and benzothiophene units contributes to the photochromic activities. These compounds exhibit reversible photochromism in the solid state and show potential for development as rewritable optical recording media.
MATERIALS CHEMISTRY FRONTIERS
(2021)
Article
Chemistry, Applied
Xinyao Wang, Shiqi Liuye, Xinhuan Ma, Shiqiang Cui, Shouzhi Pu
Summary: A novel photo-controlled solid-state fluorescence switching based on carbon dots (CDs) and diarylethene was designed and constructed. The fluorescence switching not only had excellent modulation efficiency, but also exhibited good photochromic properties. The mechanism of the reversible fluorescence modulation was attributed to the FRET between the CDs (energy donor) and the closed-ring diarylethene (energy acceptor). This work suggests the strategy of constructing solid-state fluorescence switching is feasible, and will provide new ways for the potential application of CDs and diarylethene.
Article
Chemistry, Multidisciplinary
Tomoaki Tanase, Kanako Nakamae, Yume Okawa, Mami Hamada, Arimasa Matsumoto, Takayuki Nakajima, Takuya Nakashima, Tsuyoshi Kawai
Summary: A P-stereogenic linear tetraphosphine tetraoxide was synthesized to prepare lanthanide(III) complexes with P-chiral multidentate phosphine oxides. The photophysical properties of the complexes revealed significant chiral induction from the P-chiral centers through intramolecular pi-pi stacking constraint.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Haru Hirai, Shinjiro Takano, Takuya Nakashima, Takeshi Iwasa, Tetsuya Taketsugu, Tatsuya Tsukuda
Summary: In this study, a series of MAu12(dppe)(5)Cl-2 compounds with icosahedral structures were synthesized and their electronic structures, photoluminescence, and photocatalytic properties were systematically investigated. Doping an M element at the lower left of the periodic table expanded the energy gap between HOMO and LUMO, resulting in enhanced photoluminescence quantum yield. MAu12 (M=Pt, Rh, or Ir) exhibited higher photocatalytic activity than Au-13.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Takuya Nakashima, Riku Tanibe, Hiroto Yoshida, Masahiro Ehara, Miwa Kuzuhara, Tsuyoshi Kawai
Summary: Pathway-dependent chirality control in silver nanoclusters is achieved by using enantiomeric ligand, leading to the formation of chiral silver nanoclusters with intrinsic chirality. Guest binding to the nanoclusters' shell can reverse the stability between right- and left-handed nanoclusters, resulting in unprecedented chirality inversion.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Joy Ann Panis, Marine Louis, Arnaud Brosseau, Shouhei Katao, Florencio de los Reyes, Takuya Nakashima, Remi Metivier, Clemence Allain, Tsuyoshi Kawai
Summary: In this study, we synthesized two different bichromophoric difluoroboron-beta-diketonate compounds with different connectivity using cyclohexane diamine as a chiral bridge. TD-DFT calculations and experiments revealed that the connectivity variation affects the spatial arrangement and chirality inversion of the compounds. The compound with para connectivity showed higher absorption values, and ultrasonication and heating induced the formation of highly ordered nano-helical wires, leading to increased emission values.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Chemistry, Physical
Yasuto Nakagawa, Boda Yu, Yoshiaki Niidome, Keita Hayashi, Aleksandar Staykov, Miku Yamada, Takuya Nakashima, Tsuyoshi Kawai, Tsuyohiko Fujigaya, Tomohiro Shiraki
Summary: This study demonstrates that covalent attachment of a diarylethene derivative to single-walled carbon nanotubes introduces carbon defects, leading to near-infrared photoluminescence. Furthermore, reversible and repetitive wavelength switching of the photoluminescence is achieved based on photoisomerization of the diarylethene moieties on the nanotubes.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Jumpei Kuno, Nicolas Ledos, Pierre-Antoine Bouit, Tsuyoshi Kawai, Muriel Hissler, Takuya Nakashima
Summary: This study demonstrates the induction of circularly polarized luminescence (CPL) in achiral fluorescent molecules by grafting them onto inorganic nanoparticles with a chiral shape. The chiralities of crystallography and morphology of mercury sulfide (HgS) nanoparticles are independently considered and the twist direction of the nanoparticles can be modified to regulate the sign of CPL signals. This research reveals a method for chirality control on inorganic nanoparticles.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Organic
HaiYing Liu, Mikiya Suzuki, Kiyomi Kakiuchi, Tsuyoshi Kawai, Tsumoru Morimoto
Summary: This study reports a series of photolabile molecules based on 1,4-naphthoquinone (NQ), which can release various functional compounds under light irradiation. The synthesis of these compounds involves a concise method to attach different functional groups such as alcohols, amines, and acids. The functional compounds are masked with a common precursor and can be efficiently released through UV light irradiation.
SYNTHESIS-STUTTGART
(2023)
Article
Chemistry, Multidisciplinary
Erin Hayashi, Naoto Akiyama, Kiyomi Kakiuchi, Tsuyoshi Kawai, Tsumoru Morimoto
Summary: We developed a rhodium(I)-catalyzed asymmetric cyclohydroformylation reaction of 1,6-enynes with formaldehyde. The reaction proceeds with high enantioselectivity, producing aldehyde products with higher-order structures. This method demonstrates wide compatibility and can be successfully applied to various enynes, providing a versatile route to access chiral aldehydes.
CHEMISTRY-AN ASIAN JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Colin J. Martin, Yora Goto, Ryosuke Asato, Gwenael Rapenne, Tsuyoshi Kawai
Summary: Four photochromic terarylenes with extended pi-conjugated thieno[b]thiophene units were synthesized. The position of the thieno[b]thiophene units determines the exclusion of photochromic ring-cyclization and cycloreversion behavior. A spontaneous fading reaction involving both thermal and cascade cycloreversion, depending on molecular structure, was observed. Electrochemical and computational studies were conducted to investigate the relative stability of the ground and cationic states in both isomers.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
Hayato Sakai, Yudai Suzuki, Makoto Tsurui, Yuichi Kitagawa, Takuya Nakashima, Tsuyoshi Kawai, Yuta Kondo, Go Matsuba, Yasuchika Hasegawa, Taku Hasobe
Summary: Chiral 1,1'-bi-2-naphthol (BINOL)-substituted boron dipyrromethene (BODIPY) derivatives with different numbers of phenyl groups were synthesized to study their aggregation-enhanced emission and circularly polarized luminescence (CPL). The self-assembly of 0Ph-B-BODIPY resulted in fibrous nanoarchitectures, while spherical nanoparticles were formed in 1Ph-B-BODIPY and 2Ph-B-BODIPY. The nanofibers of 0Ph-B-BODIPY exhibited broad emission and CPL spectra in the red to NIR regions, with enhanced dissymmetry factors compared to the monomer and 1Ph-B-BODIPY nanoparticles.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Materials Science, Multidisciplinary
Haru Hirai, Takuya Nakashima, Shinjiro Takano, Yukatsu Shichibu, Katsuaki Konishi, Tsuyoshi Kawai, Tatsuya Tsukuda
Summary: In this study, the effects of single-atom doping on the chiroptical properties of gold superatoms were investigated. It was found that single-atom doping can improve the chiroptical properties of gold superatoms, and this study provides a rational guide for enhancing their chiroptical activity.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Marine Louis, Yan Bing Tan, Pablo Reine, Shohei Katao, Yoshiko Nishikawa, Fumio Asanoma, Tsuyoshi Kawai
Summary: This study reports on the crystal structures of three coordination polymers: [(Lambda,Lambda,Lambda,Lambda,Lambda,Lambda)- or/(Delta,Delta,Delta,Delta,Delta,Delta)Eu-6(III)(TTP)(8)(OH2)(6)Na-4]n with both conglomerate and racemic structures, (Delta,Delta,Delta,Delta)-/(Lambda,Lambda,Lambda,Lambda) Eu-4(III)(TTP)(4)(bipy)(4)(MEK)(2)(OH2)(2) with racemic tetrahedral clusters, and an achiral crystal structure of [Eu-2(III)(BTP)(4)(OH2)(2)Na-2]n (where BTP = dianionic bis-ss-diketonate, TTP = trianionic tris-ss-diketonate, and bipy = 2,2'-bipyridine). The TTP ligand's screw coordination arrangement leads to the formation of racemic EuIII products. The conglomerate crystallization of [EuIII6(TTP)8(OH2)6Na4]n is likely caused by the presence of sodium counterions and interactions between oxygen atoms and the trifluoromethyl unit of the TTP ligand and sodium ions. All Eu-III compounds exhibit characteristic red luminescence (5D0. 7FJ, J = 0-4) in solution or in the solid crystalline state. Circularly polarized luminescence (CPL) is observed in the chiral Eu-6(III)(TTP)(8)(OH2)(6)Na-4]n species, with a |glum| value ranging from 0.15 to 0.68 at the 5D0. 7F1 emission band. Subtle changes in the [Eu-6(III)(TTP)(8)(OH2)(6)Na-4]n structure, possibly due to twinned crystals or crystals that do not correspond to a perfect spontaneous resolution, account for the variation in observed CPL values.
Article
Chemistry, Multidisciplinary
Wataru Ishii, Yoshinori Okayasu, Yoichi Kobayashi, Rika Tanaka, Shohei Katao, Yoshiko Nishikawa, Takuya Nakashima, Tsuyoshi Kawai
Summary: The optical property of an ionic metal nanocluster (NC) is affected by the ionic interaction with counter ions. The modification of trianionic [Ag29(BDT)12(TPP)4]3- NC with silver(I) complexes led to intense photoluminescence (PL) in the near-infrared (NIR) region. The binding of silver(I) complexes to the peripheral region of Ag29 NC is confirmed by various measurements, and the change in excited-state dynamics by the binding is discussed.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Ruiji Li, Qi Fang, Minghui Chen, Mihoko Yamada, Yugo Tsuji, Yusuke Kugai, Wei Li, Tsuyoshi Kawai
Summary: This study reports the synthesis and photochemical characterization of diarylethene molecular switches based on diaryl[5]helicene. The compounds exhibit reversible photochromism and turn-off mode fluorescence photoswitching upon light irradiation. The photoinduced changes in aromaticity of the central ethene bridge facilitate the thermal bleaching rates of the switches. The research provides new insight for designing aromatic diarylethene photoswitches with reversible fluorescence switching and photoinduced changes in aromaticity.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
Yugo Tsuji, Natsuko Kanno, Chigusa Goto, Shohei Katao, Yasuo Okajima, Pablo Reine, Paulius Imbrasas, Sebastian Reineke, Katsuyuki Shizu, Takuya Nakashima, Hironori Kaji, Tsuyoshi Kawai, Marine Louis
Summary: This work presents the synthesis and characterization of a carbazole-naphthalimide donor-acceptor pair for circularly polarized thermally activated delayed fluorescence. The monomeric form shows only fluorescence, while the dimeric form exhibits TADF emission. The dimerization greatly reduces the singlet-triplet energy gap, enabling TADF emission with high photoluminescence quantum yield. In addition, the chiral target shows high performance CPL at room and low temperature, and it undergoes a transition from yellow phase to orange/red phase under mechanical stress.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)