Article
Materials Science, Multidisciplinary
Ramesh Y. Adhikari, Nicole E. Harmon, K. Paige Williams
Summary: The study demonstrates resistive switching behavior on unprocessed leaves, showing reliable switching between high and low resistance states with high endurance and potential for memory devices.
APPLIED MATERIALS TODAY
(2021)
Article
Materials Science, Multidisciplinary
Jonas Klein, Seyyed Mohsen Beladi-Mousavi, Marco Schleutker, Dereje Hailu Taffa, Markus Haase, Lorenz Walder
Summary: The study demonstrates the electrochemical luminescence switching of LaPO4:Ce, Tb nanoparticles assembled into nonconducting thin films using two electrocatalytic processes. The redox shuttles are used to access the Ce3+/4+ species for electrochemical reactions due to the insulating nature of the nanoporous films. By assembling a device that allows UV light to enter the nanoparticle layer, repetitive luminescence switching is observed.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Chemistry, Inorganic & Nuclear
Mira T. Rupp, Thomas Auvray, Garry S. Hanan, Dirk G. Kurth
Summary: In this study, the impact of N-methylation on the electronic and photophysical properties of both homoleptic and heteroleptic Ru(II) bis-terpyridine complexes based on the ligand Bipytpy was investigated. The methylated complexes showed higher luminescence quantum yields and longer excited-state lifetimes, but were found to be inactive as photosensitizers under photocatalytic conditions.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2021)
Article
Nanoscience & Nanotechnology
Dines Chandra Santra, Sanjoy Mondal, Takefumi Yoshida, Yoshikazu Ninomiya, Masayoshi Higuchi
Summary: Metallo-supramolecular polymers (MSPs) composed of a metal ion and ditopic ligand have been developed for electrochromic display applications, with polyRu-LBip showing promising properties of low redox potential, reversible color changes, and high durability. The controlled design of the ligand, tetrakis(N-methylbenzimidazolyl)bipyridine (L-Bip), has significantly improved the optical contrast, response time, and coloration efficiency of the solid-state EC device, indicating great potential for practical applications.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Inorganic & Nuclear
Robert Gericke, Joerg Wagler
Summary: This study demonstrates a series of [Pn(mu-PyO)(4)Ru(L)] complexes with Pn being P, As, and Sb, showing different coordination modes and properties. The bonding mode between Pn and Ru shifts from L-type to X-type in the series of [Pn(mu-PyO)(4)Ru(L)] complexes, resulting in the electron-rich Ru site in the case of Pn = Sb.
INORGANIC CHEMISTRY
(2021)
Article
Multidisciplinary Sciences
Peiyun Li, Junwei Shi, Yuqiu Lei, Zhen Huang, Ting Lei
Summary: Research shows that by engineering the doped states of polymers, p-type polymers can be converted to high-performance n-type materials, enabling the fabrication of high-performance n-type organic electrochemical transistors (OECTs). This finding is of great significance for improving OECT performance.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Applied
Sayan Halder, Chanchal Chakraborty
Summary: In this study, a Pt-containing Fe-terpyridine-based square-shaped metallo-supramolecular macrocycle was synthesized and characterized. The incorporation of Pt(II) improved the solubility and film forming ability, while maintaining electronic communication between metal centers. The Pt-Fe-TpyN macrocycle was used as a reversible electrochromic device (ECD) and demonstrated high optical contrast, fast-switching times, high coloration efficiency, and cycle stability. This work provides a valuable method for synthesizing metallo-macrocycles for spectrochemical and optoelectronic devices.
Article
Chemistry, Multidisciplinary
Sean J. Steinke, Eric J. Piechota, Lauren M. Loftus, Claudia Turro
Summary: This study investigates the excited states of a series of complexes [Ru(tpy)(L)(CH3CN)]n+ (1-11), and finds that the photoinduced CH3CN dissociation in these complexes occurs from the metal-to-ligand charge transfer (3MLCT) excited state instead of a dissociative triplet ligand field (3LF) state as previously believed. This discovery suggests alternative pathways for ligand photodissociation and has broad implications for the design principles of applications that require ligand photodissociation.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Polymer Science
Yong-Fu Li, Wen-Li Guan, Chun-Yu Wang, Yan Wang, Qi Lin, Ying-Wei Yang
Summary: A metallosupramolecular polymer network (DSPy subset of SHP5@Zn) was constructed by hierarchical self-assembly of a double-armed pillar[5]arene host (SHP5), a ditopic guest (DSPy), and Zn2+ ions, with host-guest recognition and metal-ligand coordination interactions playing a crucial role. The DSPy subset of SHP5@Zn assembly exhibits reversible sol-gel transition properties in response to various external stimuli, making it an excellent candidate for constructing smart gels. In addition, it can be used as a highly selective dual-channel sensor for OH anions, facilitating the development of a convenient test kit for OH sensing.
Article
Multidisciplinary Sciences
Zizhao Huang, Zhenyi He, Bingbing Ding, He Tian, Xiang Ma
Summary: The development of pure organic room-temperature phosphorescent materials with circularly polarized luminescence has greatly facilitated the integration and systemization of luminescent materials in various science and technological applications. In this study, a type of photoinduced circularly polarized phosphorescent material was constructed by dispersing phosphorescent chiral helical substituted polyacetylenes into a processable poly(methyl methacrylate) (PMMA) matrix. These materials exhibit high absorption and luminescent dissymmetric factors, and also possess dynamic chiro-optical functionality under UV light irradiation.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Inorganic & Nuclear
Utpal Das, Priyankar Paira
Summary: The phototoxic nature of drugs in photo activated chemotherapy (PACT) has great importance in the selective treatment of diseases. This study synthesized a phototoxic anticancer agent by incorporating ruthenium(II) and iridium(III) metals into a biologically active 2,2'-biquinoline moiety. The complexes, RuBQ and IrBQ, showed significant toxicity towards HeLa and MCF-7 cancer cell lines under visible light due to the production of singlet oxygen.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Multidisciplinary
Yutaka Kuwahara, Mio Ito, Tatsumi Iwamoto, Makoto Takafuji, Hirotaka Ihara, Naoya Ryu, Tomoyasu Mani
Summary: A chiral supramolecular assembly with redox-induced changes in its chiroptical properties was synthesized using viologen-modified glutamide. The assembly showed an orange-colored solution with a visible absorption band at around 470 nm and electronic circular dichroism signals. Chemical reduction resulted in a color change to blueish violet and a sign change of the CD signal. Oxidation could restore the chiroptical behavior of the assembly.
Article
Materials Science, Multidisciplinary
Kazuko Fujii, Dines Chandra Santra, Manas Kumar Bera, Takatsugu Wakahara, Ritsuko Nagahata, Masayoshi Higuchi
Summary: In this study, the electrochromic (EC) properties of metallo-supramolecular polymers (MSPs) were improved by forming nanocomposites with a layered inorganic-imidazoline covalently bonded hybrid (LIIm). The nanocomposites exhibited improved mechanical, optical, and gas barrier properties. The findings suggest that nanocomposite thin films can achieve reversible electrochromic behavior.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Chemistry, Inorganic & Nuclear
Weijun Dai, Shiwen Yu, Ci Kong, Defang Zhao, Chixian He, Zining Liu, Jianwei Dong, Jian-Jun Liu, Feixiang Cheng
Summary: Novel monometallic, homobimetallic, and heterodimetallic Ru and Os complexes based on asymmetrical ligands LL ' have been synthesized and characterized. Spectroscopic analysis shows intense ligand-centered transitions and moderate MLCT absorption for all complexes. The dinuclear complexes exhibit unit absorption due to Os-based units. The emission intensity of Ru-based units varies due to steric hindrance at the coordination sites, and the emission of Os-based units is quenched by Os(ii) units.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Inorganic & Nuclear
Poulami Pal, Tanusree Ganguly, Soumi Das, Sujoy Baitalik
Summary: Thorough investigation on the pH-responsive optical and redox switching behaviors of recently reported bis-tridentate Ru(II) luminophores with different X (H, Me, Cl, NO2, and Ph) was conducted. The acidity of benzimidazole protons in the complexes, ground-state pK(a) values determination, excited-state pK(a)* values estimation, and proton-coupled electrochemical behaviors were thoroughly studied. The complexes act as potential pH-responsive colorimetric, emission, and redox switches, with X inducing a small but finite effect on pK(a) values.
DALTON TRANSACTIONS
(2021)
Article
Chemistry, Multidisciplinary
Manas Kumar Bera, Yoshikazu Ninomiya, Masayoshi Higuchi
Summary: The stepwise introduction of three different transition metals into a metallo-supramolecular polymer has successfully led to the synthesis of a polymer with quad-color electrochromic properties. This synthetic method can be extended to fabricate other MSPs with different compositions, exhibiting a broad optical and electrochemical window.
COMMUNICATIONS CHEMISTRY
(2021)
Article
Nanoscience & Nanotechnology
Dines Chandra Santra, Sanjoy Mondal, Takefumi Yoshida, Yoshikazu Ninomiya, Masayoshi Higuchi
Summary: Metallo-supramolecular polymers (MSPs) composed of a metal ion and ditopic ligand have been developed for electrochromic display applications, with polyRu-LBip showing promising properties of low redox potential, reversible color changes, and high durability. The controlled design of the ligand, tetrakis(N-methylbenzimidazolyl)bipyridine (L-Bip), has significantly improved the optical contrast, response time, and coloration efficiency of the solid-state EC device, indicating great potential for practical applications.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Shoma Nakamura, Kota Sekiya, Shinichiro Matano, Yui Shimura, Yuuki Nakade, Kenta Nakagawa, Yasuaki Monnai, Hideyuki Maki
Summary: Graphene, with its excellent properties, is a promising material for optical devices. Researchers have designed and fabricated an on-chip optical switch equipped with a graphene heater, demonstrating its high modulation speed and efficiency. This graphene-based optical switch on a silicon chip exhibits high efficiency and speed, enabling high-performance silicon photonics and integrated optoelectronic applications.
Article
Chemistry, Multidisciplinary
Kenta Nakagawa, Yui Shimura, Yusuke Fukazawa, Ryosuke Nishizaki, Shinichiro Matano, Shuma Oya, Hideyuki Maki
Summary: Graphene-based infrared spectroscopy and imaging, with its planar structure, bright intensity, small footprint, and high modulation speed, opens up new possibilities for infrared applications in various fields.
Article
Polymer Science
Kazuko Fujii, Manas Kumar Bera, Dines Chandra Santra, Masayoshi Higuchi
Summary: By forming nanocomposites of polyFe and LIIm, the electrochromic properties can be improved and the memory properties can be enhanced without reducing the contrast in transmittance. The composites exhibit redox waves in the cyclic voltammograms and are estimated to be diffusion controlled.
Article
Chemistry, Physical
Zi-Jie Gong, Yemineni S. L. Narayana, Yen-Chun Lin, Wei-Hsiang Huang, Wei-Nien Su, Yi-Pei Li, Masayoshi Higuchi, Wen-Yueh Yu
Summary: In this study, ruthenium-based metallo-supramolecular polymers (Ru-MSPs) were synthesized and used for heterogeneously catalytic transfer hydrogenation of carbonyl compounds. The polymerization process was controlled by adjusting the ligand/metal ratio and synthesis conditions. The coordinatively unsaturated ruthenium atoms were identified as the active sites for carbonyl reduction, and the Ru-MSPs exhibited enhanced activity and reusability compared to monomeric counterparts.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Chemistry, Multidisciplinary
Shinichiro Matano, Natsumi Komatsu, Yui Shimura, Junichiro Kono, Hideyuki Maki
Summary: A broadband thermal emitter of polarized infrared radiation with high switching speeds has been developed using aligned carbon nanotube films, which can lead to advanced spectroscopic analysis techniques with polarized radiation.
Article
Materials Science, Multidisciplinary
Kazuko Fujii, Dines Chandra Santra, Manas Kumar Bera, Takatsugu Wakahara, Ritsuko Nagahata, Masayoshi Higuchi
Summary: In this study, the electrochromic (EC) properties of metallo-supramolecular polymers (MSPs) were improved by forming nanocomposites with a layered inorganic-imidazoline covalently bonded hybrid (LIIm). The nanocomposites exhibited improved mechanical, optical, and gas barrier properties. The findings suggest that nanocomposite thin films can achieve reversible electrochromic behavior.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Jian Zhang, Satya Ranjan Jena, Masayoshi Higuchi
Summary: This study presents an electrical color printing approach using electrochromic metallosupramolecular polymers to achieve rewritable image printing. The printed information has a long retention time, high stability, and can be naturally erased under humid conditions.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Shinichiro Matano, Hidenori Takahashi, Natsumi Komatsu, Yui Shimura, Kenta Nakagawa, Junichiro Kono, Hideyuki Maki
Summary: In this study, a nano-device of densely packed and highly aligned carbon nanotube films on silicon chips was found to emit polarized light with a broad spectrum. By adjusting the angle between the electrical bias and the CNT alignment direction, specific spatial emission patterns were observed. This discovery may greatly expand the range of applications for microsized light sources.
ACS MATERIALS LETTERS
(2022)
Article
Polymer Science
Masayoshi Higuchi, Yukio Fujii
Summary: This study successfully developed a designed and flexible electrochromic display device with memory property, which can be used as energy-saving smart windows or digital signages. The display changes were controlled by the etching pattern using mechanical etching technique.
JOURNAL OF PHOTOPOLYMER SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Masayoshi Higuchi, Yukio Fujii, Yoji Hisamatsu
Summary: Metallo-supramolecular polymers (MSPs) are a novel type of electrochromic (EC) materials that show reversible color changes between orange and pale green. The color changes are caused by metal-to-ligand charge transfer (MLCT) absorption. Insulating films can enhance the display effect on EC devices.
ITE TRANSACTIONS ON MEDIA TECHNOLOGY AND APPLICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Hsin-Che Lu, Li-Yin Hsiao, Sheng-Yuan Kao, Yuki Seino, Dines Chandra Santra, Kuo-Chuan Ho, Masayoshi Higuchi
Summary: Durable electrochromic devices driven at 0.8 V were successfully fabricated using the complementary chromic combination of Fe(II)-based metallo-supramolecular polymer (polyFe) and Prussian blue analogues (PBAs). By utilizing polyFe and NiHCF as the EC pair, a dramatic decrease in driving voltage was achieved, with S-ECD showing better durability in long term stability tests.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Yemineni S. L. Narayana, Sanjoy Mondal, Utpal Rana, Yoshikazu Ninomiya, Dines Chandra Santra, Takefumi Yoshida, Masayoshi Higuchi
Summary: The three-dimensionally hyperbranched Fe(II)-based metallo-supramolecular polymer (polyFe3-D) was synthesized in one step for development of durable electrochromic materials, showing wide absorption, large optical contrast, and high coloration efficiency. The polyFe3-D exhibited reversible redox reactions in cyclic voltammetry and covered a wide visible region with MLCT absorptions, demonstrating high quality and stability.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
D. Abu Saleh, U. Rana, M. Higuchi, A. Sosnik
MATERIALS TODAY CHEMISTRY
(2020)
