Article
Chemistry, Inorganic & Nuclear
Grzegorz Vetter, Agata Bialonska, Ewa Pacholska-Dudziak
Summary: Ditelluraporphodimethene, a nonaromatic porphyrinoid, undergoes different reactions with palladium(II), platinum(II), and rhodium(I). Palladium(II) forms a side-on coordination compound with two tellurium donors, while platinum(II) or rhodium(I) leads to the formation of organometallic species with metallacyclopentadiene rings. The substitution reaction selectively occurs at the conjugated part of the molecule, resulting in the incorporation of a metallacyclopentadiene ring into a porphodimethene skeleton.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Applied
Shimin Gao, Chengjie Li, Glib Baryshnikov, Hans Agren, Qizhao Li, Yongshu Xie
Summary: Novel porphyrin analogues with nonconjugated and fully-conjugated structures were prepared and their molecular conformations and hydrogen-bonded dimers formation were elucidated through single crystal X-ray diffraction analysis in this study.
Article
Chemistry, Organic
Narasinga Rao Palepu, B. Adinarayana, M. Murugavel, Kumari Garima, Sangya Chitranshi, A. Srinivasan
Summary: The three-dimensional cryptand-like normal and doubly-N-confused calixbenzophyrins embedded with phenyl rings in the macrocyclic skeleton were successfully synthesized from single starting materials. These structural isomers were characterized through spectral studies and unambiguously confirmed by crystal analyses.
Review
Chemistry, Inorganic & Nuclear
Avisikta Sinha, Tamal Chatterjee, Mangalampalli Ravikanth
Summary: This review discusses the unique coordination chemistry of boron with different porphyrinoids, showcasing their distinct photophysical and redox properties. The limited practical applications of boron porphyrinoids are highlighted, along with the potential for further exploration in fields such as photocatalysis, solar energy conversion, and clinical applications.
COORDINATION CHEMISTRY REVIEWS
(2022)
Article
Chemistry, Organic
B. Sathish Kumar, Brijesh Chandra, K. V. Jovan Jose, Pradeepta K. Panda
Summary: The synthesis of tetrapyrrane 8 from acetone and pyrrole via one-step condensation was achieved for the first time, along with an improved yield of tripyrrane 9. The diborylation of tetrapyrrane and subsequent 1 + 1 cyclocoupling with 1,2-diiodobenzene following the Suzuki protocol led to the generation of a novel o-phenylene incorporated macrocycle. This macrocycle displayed exclusive turn-on fluorescence sensing of fluoride ion through a unique partial cone conformation supported by DFT analysis in acetonitrile solvent.
JOURNAL OF ORGANIC CHEMISTRY
(2021)
Article
Chemistry, Inorganic & Nuclear
Sabari Panchavarnam, Rima Sengupta, Mangalampalli Ravikanth
Summary: A simple alpha-formyl pyrrolyl dipyrromethene ligand was synthesized and a Pd(ii) complex of the ligand was successfully prepared. The complex exhibited a distorted square planar geometry and was stabilized by hydrogen bonding with a coordinated water molecule. The complex showed strong absorption and electron-deficient nature. It also demonstrated good catalytic efficiency in the Suzuki-Miyaura coupling reaction.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Multidisciplinary
Shivaprasad Achary Balahoju, Yogesh Kumar Maurya, Piotr J. Chmielewski, Tadeusz Lis, Mateusz Kondratowicz, Joanna Cybinska, Marcin Stepien
Summary: Peripheral substitution of a pi-extended porphyrin with bulky groups can control its curvature and stereochemistry. The coordination of large metal ions and the variation of substituents and ligands affect this control. Experiments have shown that stable enantiopure porphyrin propellers can be synthesized by adjusting experimental conditions.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Inorganic & Nuclear
Jian-Hua Ding, Yu-Feng Liu, Zhao-Teng Tian, Pei-Jie Lin, Feng Yang, Ke Li, Guo-Ping Yang, Yong-Ge Wei
Summary: A novel uranyl-containing polytungstate, U-3, was synthesized using a Keggin-type precursor and UO2(OAc)2, and characterized by X-ray diffraction and various techniques. U-3 exhibited a quadrahedron-like structure with a central {K-4(UO2)(3)(H2O)(3)} cluster surrounded by {α-SiW9} and {γ-SiW10} building units. Furthermore, U-3 showed good catalytic activity in the dehydration condensation of aldehydes, acetoacetates, and urea to synthesize dihydropyrimidin-2(1H)-ones with solvent-free conditions, water as the sole by-product, available starting materials, good compatibility, and operational simplicity.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Multidisciplinary
Bastiaan Kooij, Zhaowen Dong, Farzaneh Fadaei-Tirani, Rosario Scopelliti, Kay Severin
Summary: Bent (hetero)allenes, such as carbodicarbenes and carbodiphosphoranes, have diverse applications in coordination chemistry as neutral C-donor ligands. N-Heterocyclic diazoolefins function similarly to L-type ligands, and in this study, the synthesis and reactivity of anionic diazoolefin are described. The anionic diazoolefin displays distinct reactivity, allowing for the preparation of diazo compounds via protonation, alkylation, or silylation. It can also be employed as an ambidentate, X-type ligand in salt metathesis reactions with metal halide complexes, resulting in the formation of a stable phosphinocarbene through the extrusion of dinitrogen.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Lukas Fischer, Friedrich Wossidlo, Daniel Frost, Nathan T. Coles, Simon Steinhauer, Sebastian Riedel, Christian Mueller
Summary: The direct synthesis of 1-methyl-phosphininium salts was achieved for the first time by reacting aromatic lambda(3),sigma(2)-phosphinines with dimethyl chloronium salt [(CH3)(2)Cl](+)[Al(OTeF5)(4)](-). The high electrophilicity of the alkylation reagent in combination with the weakly coordinating pentafluoro-orthotelluratoaluminate anion provides excellent conditions for this one-step approach. This simple and quantitative access to 1-methyl-phosphininium salts will pave the way for further exploration of the chemistry of such reactive species.
CHEMICAL COMMUNICATIONS
(2021)
Article
Chemistry, Inorganic & Nuclear
Yang Luo, Wei Zhang, Xi Nan Yang, Mao Xia Yang, Wen Min, Zhu Tao, Xin Xiao
Summary: In this study, a novel orthogonal supramolecular polymer was successfully constructed with excellent fluorescence properties, demonstrating good recognition and classification abilities towards various acidic compounds and iodide ions.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Ekaterina N. Zorina-Tikhonova, Aleksandr S. Chistyakov, Veronika A. Novikova, Daniil A. Knyazev, Natalia V. Gogoleva, Daniil O. Blinou, Nikolay N. Efimov, Pavel V. Dorovatovskii, Mikhail A. Kiskin, Igor L. Eremenko, Anna V. Vologzhanina
Summary: The design of coordination polymers with a specific architecture requires understanding the regularities of metal coordination, ligand coordination, and framework topology. This study demonstrated the impact of local coordination on the dimensional and topological properties of coordination polymers containing copper(ii) malonates. Eight novel complexes were synthesized and characterized, and the most abundant networks were evaluated and compared to zinc(ii)-containing analogs. The results showed that the square lattice topology was highly abundant for copper(ii) malonates with N,N'-containing linkers.
Review
Chemistry, Multidisciplinary
El-Sayed M. El-Sayed, Yi Di Yuan, Dan Zhao, Daqiang Yuan
Summary: In recent years, the synthesis of porous crystalline materials, such as metal-organic frameworks and organic cages, with tunable atomic structures has shown great potential in various fields. Discrete metal-organic cages, in particular, have attracted attention due to their molecular nature and solution-processability. The zirconium MOC family, known for its robust nature and high hydrothermal stability, holds significant potential for expanding applications. This Account highlights recent advances in synthesizing zirconium MOCs and their applications in higher-dimensional frameworks.
ACCOUNTS OF CHEMICAL RESEARCH
(2022)
Review
Chemistry, Inorganic & Nuclear
Hortense Lauwick, Matthew P. Duffy, Pierre-Antoine Bouit, Muriel Hissler
Summary: Four-membered ring heterocycles, especially phosphetenes, have been less studied than their larger counterparts. However, they exhibit specific reactivities of unsaturated strained cycles and phosphines, making them versatile synthons for original organophosphorus derivatives.
COORDINATION CHEMISTRY REVIEWS
(2021)
Article
Chemistry, Multidisciplinary
Nisha Rawat, Avisikta Sinha, Mangalampalli Ravikanth
Summary: Four stable nonaromatic pyridine-containing heteroheptaphyrins were successfully synthesized in yields of 8-13% by [5+2] condensation. The macrocycles exhibited asymmetric structures and experienced upfield/downfield shifts in core proton positions compared to a previously reported symmetric heterohexaphyrin. The absorption bands were significantly red-shifted, indicating an increase in pi-delocalization, supported by theoretical studies.
CHEMISTRY-AN ASIAN JOURNAL
(2022)
Article
Green & Sustainable Science & Technology
Xin-Gui Li, Yun-Bin Xie, Mei-Rong Huang, Tomokazu Umeyama, Hiroshi Imahori
Summary: A new type of waterborne polyurethane film has been developed with high hardness and transparency, offering strong adhesion to Al nanofilm and easy peelability from PET film.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Chemistry, Multidisciplinary
Keiichi Ishida, Tomohiro Higashino, Yoshimasa Wada, Hironori Kaji, Akinori Saeki, Hiroshi Imahori
Summary: This study investigated the impact of heterole-fused structures on the physicochemical properties of thiophene-fused naphthodiphospholes. Isomers with different fused structures exhibited distinct phosphorescence or fluorescence characteristics, as well as varied stacking arrangements. The controlled fusion of heterole rings is revealed as a universal approach to uncover the intrinsic properties of organic functional materials for versatile applications.
Article
Chemistry, Multidisciplinary
Sharvan Kumar, Kohshi Yoshida, Yusuke Hattori, Tomohiro Higashino, Hiroshi Imahori, Shu Seki
Summary: This study reports a strategic methodology for isolation of stable negatively charged organic compounds and provides detailed descriptions of the structures and properties of two mysterious compounds. These compounds exhibit high stability under ambient conditions due to their high delocalization, and can be purified by column chromatography.
Article
Chemistry, Physical
Tomokazu Umeyama, Tatsuho Wada, Kensho Igarashi, Kosaku Kato, Akira Yamakata, Taiki Takeyama, Yuji Sakamoto, Yasunari Tamai, Hideo Ohkita, Keiichi Ishida, Tomoyuki Koganezawa, Shunsuke Ohtani, Kazuo Tanaka, Hiroshi Imahori
Summary: Terminal-group halogenation can effectively impact the energy levels, light-harvesting ability, and intermolecular stacking of nonfullerene acceptors in organic photovoltaic devices. The study on three A-D-A-type NFAs, NTTIC-F, NTTIC-Cl, and NTTIC, revealed significant differences in film structure, photophysical properties, and photovoltaic performance, particularly with NTTIC-Cl showing enhanced absorption and energy levels. The observation of different molecular orientations of NFAs based on the type of halogenation atom at the terminal A unit is novel, highlighting the importance of halogenation in designing NFAs.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Qi Guo, Tomohiro Higashino, Kosaku Kato, Akira Yamakata, Hiroshi Imahori
Summary: Donor-pi-acceptor type porphyrin-fullerene dyads with an acetylene bridge were designed and synthesized. The dyad was found to produce a stable charge-separated state in benzonitrile. Compared to the porphyrin reference without the fullerene moiety, the p-type dye-sensitized solar cells with the dyad exhibited higher photovoltaic performance.
Article
Nanoscience & Nanotechnology
Sharvan Kumar, Yun Hee Koo, Tomohiro Higashino, Wakana Matsuda, Samrat Ghosh, Yusuke Tsutsui, Masayuki Suda, Hiroshi Imahori, Katsuaki Suzuki, Hironori Kaji, Shu Seki
Summary: The preparation and characterization of a new class of electron deficient organic compounds, truxenone triimide (TTI), is reported. The electrochemical analysis confirms that multi-imidization helps in lowering the LUMO energy level, resulting in improved optoelectronic and/or semiconducting properties. The charge carrier transport properties and dynamics of the compounds are studied using flash-photolysis time-resolved microwave conductivity measurements. Compound 2D exhibits a high electron mobility of 0.27 cm(2) V-1 s(-1) under ambient conditions.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Physical
Tomohiro Higashino, Hiroshi Imahori
Summary: Redox shuttles are crucial in the performance of DSSCs. Copper(I/II) complexes have emerged as third-generation redox shuttles and achieved up to 13% power conversion efficiency due to their more positive redox potentials.
ACS ENERGY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Tomohiro Higashino, Rikiya Iizumi, Hiroshi Imahori
Summary: A rational synthetic approach for benzoheterole-fused porphyrins was developed and applied to the synthesis of benzothiophene- and indole-fused porphyrins. The resulting fused porphyrins exhibited red-shifted absorption and fluorescence, attributed to effective pi-expansion through heterole-fused structures. Furthermore, the pi-circuit of the indole-fused porphyrin could be controlled by a central metal ion.
Article
Polymer Science
Shaoxian Li, Ryosuke Nishikubo, Tatsuho Wada, Tomokazu Umeyama, Hiroshi Imahori, Akinori Saeki
Summary: This study evaluates the charge carrier dynamics in different structured organic solar cells and reveals the factors limiting the power conversion efficiency (PCE). The results show that the OSC with the highest PCE has low electron and hole mobilities, while the one with higher electron and hole mobilities has a lower PCE. Additionally, the OSC with the highest PCE exhibits the smallest bimolecular recombination coefficient.
Article
Chemistry, Multidisciplinary
Tomohiro Higashino, Kenichi Sugiura, Keigo Namikawa, Hiroshi Imahori
Summary: Trifluoromethyl groups were introduced into a push-pull-type porphyrin dye to modulate its energy levels and improve light-harvesting ability. The introduction of trifluoromethyl groups effectively lowered the excited-state oxidation potential of the dye. However, DSSCs using the dye with trifluoromethyl groups exhibited a lower power conversion efficiency due to aggregation tendencies.
JOURNAL OF PORPHYRINS AND PHTHALOCYANINES
(2023)
Review
Chemistry, Multidisciplinary
Hiroshi Imahori
Summary: We have designed and synthesized donor-acceptor linked systems to investigate the process of photo-induced charge separation. Porphyrin-fullerene and polymer-fullerene linked molecules have been found to be effective model systems for studying issues in excited-state generation, charge separation, and charge dissociation. We have also proposed a new concept, dynamic exciton, to establish a comprehensive photochemistry involving the manipulation of locally excited state, charge-transfer state, and charge-separated state. Moreover, we have developed versatile dyes and donor/acceptor molecules for better understanding the underlying mechanism and improving the performance of dye-sensitized solar cells and bulk heterojunction organic solar cells. Additionally, we have successfully utilized the giant dipole moment produced from donor-acceptor linked molecules to regulate the membrane potential of living biological cells, which is a promising approach in optogenetics and neuronal therapy by light.
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN
(2023)
Article
Chemistry, Multidisciplinary
Qi Guo, Behnam Ghalei, Detao Qin, Daizu Mizutani, Ikumi Joko, Habib Al-Aziz, Tomohiro Higashino, Masateru M. Ito, Hiroshi Imahori, Easan Sivaniah
Summary: Graphene oxide (GO) serves as a promising platform for gas separation membranes. By introducing positively charged fullerene C-60 derivatives onto GO sheets, the interlayer spacing can be adjusted, resulting in enhanced gas separation efficiency.
CHEMICAL COMMUNICATIONS
(2023)
Review
Chemistry, Physical
Yuzhe Zhang, Tomohiro Higashino, Hiroshi Imahori
Summary: In recent decades, significant efforts have been devoted to developing porphyrin sensitizers for dye-sensitized solar cells (DSSCs) due to their advantages of easy fabrication, low-cost production, and relatively high power conversion efficiency (PCE). Certain molecular design principles and synthetic strategies have been proven effective in constructing high-performance porphyrin-based DSSCs. This review emphasizes the promising and effective synthetic strategies for rational design of porphyrins as sensitizers and highlights the key factors that greatly influence the photovoltaic performance, providing insightful perspectives on the correlation between molecular structure and photovoltaic performance.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Hiroshi Imahori
Summary: Dye-sensitized solar cells and bulk heterojunction organic photovoltaics have gained attention for their cost-effective potential in photovoltaic applications. Rational molecular engineering of organic materials in the photoactive layers can modulate their fundamental properties, meeting the requirements for high-performance organic photovoltaics. This article highlights recent representative examples developed by our team.
TWENTY-NINETH INTERNATIONAL WORKSHOP ON ACTIVE-MATRIX FLATPANEL DISPLAYS AND DEVICES: TFT TECHNOLOGIES AND FPD MATERIALS (AM-FPD 22)
(2022)
Review
Engineering, Electrical & Electronic
Lorenzo Vallan, Hiroshi Imahori
Summary: Carbon dots (CDs) are a broad term encompassing various organic materials obtained from different reagents and synthetic routes. The previously held belief that the fluorescence emission of CDs is attributed to large aromatic structures has been significantly downsized due to recent studies. Researchers have found that the chemical and emissive nature of CDs is specific to the combination of synthetic precursors used, and these systems also comprise nanoparticles, single molecules, oligomers, and aggregates with unique fluorescent behavior. This review is divided into two parts, discussing the structural and optical properties of different types of citric acid-based CDs as a benchmarking class, and their applications in energy conversion.
ACS APPLIED ELECTRONIC MATERIALS
(2022)