Article
Multidisciplinary Sciences
Inho Song, Jaeyong Ahn, Hyungju Ahn, Sang Hyuk Lee, Jianguo Mei, Nicholas A. Kotov, Joon Hak Oh
Summary: In this study, a simple and powerful method was used to fabricate chiroptical flexible layers through supramolecular helical ordering of conjugated polymer chains. The multiscale chirality and optical activity of these layers can be varied across a broad spectral range by chiral templating. After template removal, chromophores remain in one-dimensional helical nanofibrils, producing a homogeneous chiroptical layer with drastically enhanced polarization-dependent absorbance, enabling well-resolved detection and visualization of the spin angular momentum (SAM) of photons. This study provides a scalable path towards on-chip detection of the spin degree of freedom of photons necessary for encoded quantum information processing and high-resolution polarization imaging.
Article
Materials Science, Multidisciplinary
Mingyang Wang, Kai Yang, Xujie Wang, Zhan'ao Tan, Kai Pan, Jianping Deng, Biao Zhao
Summary: This work presents the first circularly polarized organic light-emitting diodes (CP-OLEDs) using chiral helical polymers as inducers. The CP-OLEDs show high electroluminescence dissymmetry factors (gEL) and good device performance. By adopting an inverted device structure, the device performance of the CP-OLEDs is significantly improved.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Anemar Bruno Kanj, Jochen Buerck, Nina Vankova, Chun Li, Dragos Mutruc, Abhinav Chandresh, Stefan Hecht, Thomas Heine, Lars Heinke
Summary: The study introduces a nanoporous solid material that induces chirality and enantioselective enrichment through circularly polarized light. Based on a crystalline metal-organic framework, the material utilizes photoswitchable fluorinated azobenzenes to induce chirality through trans-to-cis photoisomerization. Experimental results demonstrate that CPL causes chiral photoresolution, resulting in an optically active material.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
Tai-Ge Dong, Zheng-Luang Wu, Fang-Ling Li, Jun-Zhuan Wang, You-Xuan Zheng, Lin-Wei Yu
Summary: This study demonstrates the assembly of orderly silicon nanowires into a flexible multilayer 3D superstructure, which greatly enhances the circularly polarized electroluminescence (CPEL) of organic light-emitting diodes (CP-OLEDs). The helical-stacking approach shows promise in improving the performance of CP-OLEDs for scalable and flexible chiroptical applications.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Ling-Yun Wang, Zheng-Fei Liu, Kun-Xu Teng, Li-Ya Niu, Qing-Zheng Yang
Summary: N,O-boron-chelated dipyrromethene derivatives exhibiting circularly polarized luminescence (CPL) in both solution and aggregated state were reported. The CPL is originated from the helical chirality through intramolecular substitution of fluorine by an alkenolic substituent. The self-assembly of the fluorophores significantly enhances the |g(lum)| values from 10(-4) to 10(-2).
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Chenlu He, Yan Li
Summary: This article reviews the historical research on circularly polarized light (CPL)-induced absolute asymmetric synthesis, including chiral organic molecules, helical polymers, supramolecular assemblies, and noble metal nanostructures. However, based on these results, it is concluded that the chiral photon-matter interaction is very weak, resulting in a very small enantiomeric excess for the product. Therefore, the recently emerged superchiral field technology, which can enhance the dissymmetry of the optical field and near-field, is highlighted.
CHINESE CHEMICAL LETTERS
(2023)
Review
Chemistry, Multidisciplinary
Xujie Wang, Shuo Ma, Biao Zhao, Jianping Deng
Summary: Circularly polarized luminescence (CPL) materials, particularly circularly polarized phosphorescence (CPP) materials with long life-time, have gained significant attention for their promising applications. This review summarizes the recent advances of CPP materials, including transition metal complexes, organic small molecules, polymers, and organic/inorganic hybrid materials. It also highlights the applications of CPP materials in organic light-emitting diodes and encryption display, and discusses the current challenges and future perspectives for the rational design of advanced CPP materials.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Lei Xu, Bao-Rui Gao, Xun-Hui Xu, Li Zhou, Na Liu, Zong-Quan Wu
Summary: Cyclic polymers prepared via ring-expansion polymerization with chiral Pd-II catalysts exhibit predictable molecular weight and low dispersity, and can be used for the synthesis of cyclic bottlebrush polymers with a chiral helical backbone, showing interesting optical properties.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Multidisciplinary Sciences
Yuan Wang, Dian Niu, Guanghui Ouyang, Minghua Liu
Summary: In this study, a selective-recognized and chirality-matched co-assembly strategy was used to fabricate fluorescent pi-amino acids into double helical pi-aggregates with exceptional strong circularly polarized luminescence. The double-stranded helical organization of these pi-amino acids was cooperatively assisted by both CH-pi and hydrogen-bond arrays with chirality match. The well-defined spatial arrangement effectively suppressed non-radiative decay pathways and facilitated chiral exciton couplings, resulting in superior CPL.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Hongdan Wang, Yang Liu, Lingling Wang, Bikshapathi Raktani, Taehun Yang, Kim My Tran, Yongguang Luo, Jianmin Yu, Haksung Lee, Hyoyoung Lee
Summary: Using a new supramolecular organogel, helical nanoribbons with high helicity degree can be generated by irradiating with right- or left-circularly polarized light. The helical direction of the nanoribbons can be controlled by the direction of the circularly polarized light. This concept has potential applications in biology, pharmacology, and chiral optics.
ACS MATERIALS LETTERS
(2022)
Review
Polymer Science
Jun Su Kang, Namhee Kim, Taehyung Kim, Myungeun Seo, Byeong-Su Kim
Summary: This review discusses the introduction of asymmetry into a supramolecular system via external chiral stimuli and the mechanisms of photon-to-matter chirality transfer at the supramolecular level. It also covers asymmetric photochemical reactions and the creation of a chiral bias upon CPL irradiation.
MACROMOLECULAR RAPID COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Xiqian Wang, Luyang Zhao, Chiming Wang, Xuenan Feng, Qing Ma, Gengxiang Yang, Tianyu Wang, Xuehai Yan, Jianzhuang Jiang
Summary: The article reports on the regulation of common dipeptide assemblies into unprecedented helical nanotubes exhibiting intense circularly polarized luminescence by simply doping a small number of phthalocyanine molecules. Despite varying the Fmoc-FF/Pc molar ratios over a wide range, the nanotube structures remain unchanged. The results suggest the potential for fine-tuning helix and supramolecular nanotubes with CPL properties using a small number of cofactors.
Article
Chemistry, Multidisciplinary
Qingyang Wang, Li Yuan, Cheng Qu, Tingting Huang, Xiaoxian Song, Yincai Xu, You-Xuan Zheng, Yue Wang
Summary: This study develops a pair of high-performance circularly polarized multiple-resonance thermally activated delayed fluorescence enantiomers, which can be fabricated into highly efficient circularly polarized organic light-emitting diodes. The optimized devices exhibit pure green emission, high external quantum efficiency, and clear circularly polarized electroluminescence signals.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Hirotoshi Sakaino, Dirk J. Broer, Stefan C. J. Meskers, E. W. Meijer, Ghislaine Vantomme
Summary: Control over molecular motion is achieved by fabricating cholesteric liquid-crystal networks using circularly polarized light, without the need for chiral dopant or plasticizer. The resulting materials exhibit excellent thermal stability, reversible light-induced memory features, and the ability to fabricate photo-patterned films of liquid-crystal networks with opposite helical senses.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Zhongxing Geng, Yuxia Zhang, Yu Zhang, Yiwu Quan, Yixiang Cheng
Summary: In this study, two chiral binaphthyl polymers with different dihedral angles were used as chiral inducers to construct chiral co-assemblies with an achiral dye. The resulting ordered helical nano-fibers exhibited enhanced circularly polarized electroluminescence performance. The amplified chirality and high performance were attributed to the strong pi-pi stacking interaction between the chiral polymers and the achiral dye.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Physical
Yuki Mimura, Michiya Fujiki, Yoshitane Imai
Summary: The study reports, for the first time, the observation of ambidextrous magnetic circularly polarized luminescence (MCPL) from soluble achiral CdS/ZnS core-shell quantum dots under external magnetic fields. The intensity of MCPL, g(MCPL), is on the order of 10(-3) between 400 and 460 nm, with the sign of MCPL spectra being solely controlled by the direction of the magnetic field.
CHEMICAL PHYSICS LETTERS
(2021)
Article
Chemistry, Organic
Xiaoyun Hu, Zhongyou Yin, Jianxin Guo, Jasper Adamson, Michiya Fujiki, Victor Borovkov
Summary: In this study, the stereospecific synthesis of cyclic sulfite esters from enantiopure tetraols was achieved through a diastereoselective reaction with intramolecular H-bonding interaction. The absolute configuration of the S atom was elucidated using single-crystal X-ray diffraction analysis, and the role of intramolecular hydrogen bonding interactions in the unique chemical and spectral properties was supported by theoretical calculations. Additionally, crystallographic evidence of weak H-bondings and shielding effects of neighboring phenyl rings on NMR spectral properties were presented.
JOURNAL OF ORGANIC CHEMISTRY
(2021)
Review
Multidisciplinary Sciences
Michiya Fujiki
Summary: Metastable colloids made of crystalline and/or non-crystalline matters exhibit sensitivity to chiral chemical and circularly polarized light sources, showcasing resonance effects in chirogenesis and photochirogenesis. The resonance in chirogenesis is specific to refractive indices of the surrounding medium and is influenced by the nature of the optically active optofluidic medium.
Article
Multidisciplinary Sciences
Puhup Puneet, Sajan Singh, Michiya Fujiki, Bhanu Nandan
Summary: This study investigates the evolution of homochirality of life on earth through experiments on systematically designed pi-conjugated rotamers. The results show that the CPL signals display a (-)-sign and handed dissymmetry ratio, which increase with the viscosity of achiral solvents. The research also suggests a consistent increase in the (-)-sign handed CPL signals with viscosity-induced effects.
Article
Multidisciplinary Sciences
Michiya Fujiki, Shun Okazaki, Nor Azura Abdul Rahim, Takumi Yamada, Kotohiro Nomura
Summary: This study investigated whether two types of chiroptical amplifications occur when copolymer encounter homopolymer in co-colloids, and found noticeable chiroptical inversion in some cases. The asymmetric features and differences in hydrodynamic sizes were believed to originate from the non-mirror-symmetrical main-chain stiffness of HCPSs in solution.
Article
Chemistry, Physical
Kohei Mishima, Daiki Kaji, Michiya Fujiki, Yoshitane Imai
Summary: In this study, magnetic circularly polarized luminescence (MCPL) spectroscopy was used to analyze an Eu-III(hfa)(3) complex with three chiral P-III-ligands, revealing the relationship between the spectral characteristics and symmetry of different chiral luminophores. The results showed differences in mirror-image relationships and enantiomers between different chiral luminophores.
Article
Multidisciplinary Sciences
Haruka Kano, Hironobu Hayashi, Kyohei Matsuo, Michiya Fujiki, Hiroko Yamada, Naoki Aratani
Summary: Researchers successfully synthesized an optically active C-70 derivative, X70A, and separated it into two enantiomers through optical resolution. In toluene, X70A showed mirror-image circularly polarized luminescence (CPL) spectra with a high g(lum) value, which could provide a new guideline for designing chiral nanocarbon materials.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Physical
Keiji Uehara, Haruka Kano, Kyohei Matsuo, Hironobu Hayashi, Michiya Fujiki, Hiroko Yamada, Naoki Aratani
Summary: The study successfully synthesized discrete BLG models by bridging two coronenes with a 1,8-naphthalene linkage and isolated the syn- and anti-atropisomers. X-ray crystallographic analysis revealed the structures of these models, which were further characterized using optical and spectroscopic methods.
Article
Chemistry, Inorganic & Nuclear
Ryo Amasaki, Maho Kitahara, Takahiro Kimoto, Michiya Fujiki, Yoshitane Imai
Summary: Ambidextrous magnetic circularly polarized luminescence (MCPL) and redshift in photoluminescence (PL) spectra are observed from two types of achiral soluble diamagnetic perovskite-Pb-quantum dots in toluene solution at room temperature, when subjected to external magnetic fields. The wavelengths and signs of the MCPL spectra can be controlled by the types of perovskite constituent atom and the direction of the magnetic field.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Takahiro Kimoto, Mako Okuno, Naoyoshi Nunotani, Nobuhito Imanaka, Michiya Fujiki, Yoshitane Imai
Summary: The study identified three new achiral terbium(III) inorganics that emit strong green-color magnetic circularly polarized luminescence (MCPL) when embedded in a KBr pellet in the presence of a 1.7 T external magnetic field. The green MCPL substances show potential for use as new security pigments.
INORGANIC CHEMISTRY COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Maho Kitahara, Seika Suzuki, Kana Matsudaira, Shigeyuki Yagi, Michiya Fujiki, Yoshitane Imai
Summary: The study demonstrates the development of phosphorescent organometallic molecules that exhibit full-color circularly polarised luminescence without chiral chemical influences, presenting a significant scientific and engineering challenge. Four optically inactive Iridium(III) complexes were shown to produce red-green-blue-yellow (RGBY) colored magnetic circularly polarised luminescence (MCPL) in organic solvents, with almost identical anisotropy factors in the presence of a magnetic field but exhibiting inverted signs when using the same Faraday geometries.
Article
Chemistry, Physical
Kengo Hara, Ami Morimoto, Kana Matsudaira, Satoko Suzuki, Shigeyuki Yagi, Michiya Fujiki, Yoshitane Imai
Summary: This work focuses on the development of external magnetic field driven, ambidextrous, circularly polarized electroluminescence devices. The use of racemic mixtures of phosphorescent organoiridium(III) emitters in the active emitting layer enables the chiroptical inversion of circularly polarized electroluminescence. The results demonstrate that the ligand environment and Faraday geometry have an influence on the chiroptical inversion of CPEL.
Article
Chemistry, Physical
Nobuyuki Hara, Maho Kitahara, Takaharu Sugimura, Hayato Toda, Motohiro Shizuma, Akari Ito, Makoto Miyasaka, Michiya Fujiki, Yoshitane Imai
Summary: The study demonstrates that diamagnetic achiral pyrene and phenanthrene derivatives substituted with various groups exhibit clear magnetic circularly polarised luminescence (MCPL) spectra under an external magnetic field, and their MCPL signs are susceptible to the application of different Faraday geometries.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Chemistry, Physical
Kana Matsudaira, Atsushi Izumoto, Yuki Mimura, Yoshiro Kondo, Satoko Suzuki, Shigeyuki Yagi, Michiya Fujiki, Yoshitane Imai
Summary: The study found that optically inactive, paramagnetic Ir(III)(ppy)(3) and Ir(III)(ppy)(2)(acac) showed nearly mirror-symmetric magnetic circularly polarised Luminescence (MCPL) spectra in dilute dichloromethane and dimethyl sulfoxide under N-up and S-up geometries in a 1.6-T magnetic field. However, the MCPL signs of Ir(III)(ppy)(3) and Ir(III)(ppy)(2)(acac) under the same N-up (or S-up) Faraday geometry were opposite to each other when one ppy was replaced with an acac. This ligand exchange approach provides facile control of the MCPL sign, irrespective of the Faraday geometry.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Hayato Toda, Nobuyuki Hara, Michiya Fujiki, Yoshitane Imai
Summary: 12 diamagnetic fused aromatics exhibit mirror-symmetric magnetic circularly polarised luminescence under a magnetic field, with the signs and magnitudes strongly influenced by their aromatic structures and the positions of substituents.
