Review
Chemistry, Inorganic & Nuclear
Yuichi Kitagawa, Pedro Paulo Ferreira da Rosa, Yasuchika Hasegawa
Summary: Transition metal complexes and lanthanide complexes can achieve photofunctional properties through charge transfer excited states, with a relatively new research focus on lanthanide complexes. Investigating charge transfer excited states can contribute to the development of next-generation photofunctional metal complexes.
DALTON TRANSACTIONS
(2021)
Article
Optics
Anjli Hooda, Anuj Dalal, Kapeesha Nehra, Pawan Kumar, Devender Singh, Rajender Singh Malik, Sumit Kumar
Summary: The synthesis of four red emissive complexes of europium based on Hfodo and L is described. Luminescence analysis confirmed the intense red emission of the complexes in both powder and solution form. The colorimetric parameters calculated from emission spectral data affirm the usefulness of these complexes in displays and laser diodes.
JOURNAL OF LUMINESCENCE
(2022)
Article
Astronomy & Astrophysics
Jing Song, A. Feijoo, E. Oset
Summary: We performed a theoretical study on the D-s(+) ->pi(+)pi(+)pi(-)eta decay, exploring the basic D-s(+) decay at the quark level and the subsequent production of resonances through final state interactions. By applying the G parity filter, we obtained a fair reproduction of the six mass distributions observed in the BESIII experiment.
Article
Chemistry, Inorganic & Nuclear
Chiara De Rosa, Andrea Melchior, Martina Sanadar, Marilena Tolazzi, Axel Duerkop, Fabio Piccinelli
Summary: A neutral Eu(iii) complex with S,S enantiomer of isoQC3A(3-) ligand was synthesized and spectroscopically investigated, showing similar binding constants and different enhancements of intrinsic quantum yield when compared with a similar complex using bis-anionic ligand bisoQcd(2-). Both complexes can detect citrate at extracellular concentrations up to 500 mu M, even in the presence of other interfering species, making them potential probes for fluorescence analysis of citrate in complex matrices.
DALTON TRANSACTIONS
(2021)
Article
Chemistry, Physical
F. C. Clementino, V. G. Peixoto, D. T. de Araujo, K. J. Ciuffi, E. J. Nassar, M. A. Vicente, V. Rives, E. H. de Faria
Summary: In this study, solid materials were prepared by kaolinite functionalization with pyridine 2-carboxylic and pyridine 2,6-dicarboxylic acids, and europium (III) ions were complexed on these solids. The obtained luminescent materials were characterized and evaluated for their potential applications as luminescent sensors. The results showed that the samples functionalized with picolinic and dipicolinic acids exhibited high quantum efficiencies. In the contaminant adsorption tests, the solid material with picolinic acid demonstrated better detection efficiency for chromium (III) in a low concentration range compared to the one with dipicolinic acid.
APPLIED CLAY SCIENCE
(2022)
Article
Chemistry, Inorganic & Nuclear
Ping Yu, Dan Peng, Li-Hua He, Jing-Lin Chen, Jin-Yun Wang, Sui-Jun Liu, He-Rui Wen
Summary: The study explores a stimuli-responsive cuprous luminescent complex with two crystalline polymorphs demonstrating distinct emissions, shedding light on the relationship between mechanochromic luminescence and intramolecular π···π interactions and geometrical configuration. Results suggest the rational utilization of switchable intramolecular π···π interactions as a feasible approach for developing stimuli-responsive intelligent luminescent materials and devices.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Organic
Nadine Leygue, Claude Picard, Pamela Faure, Emmanuel Bourrier, Laurent Lamarque, Jurriaan M. Zwier, Chantal Galaup
Summary: This work focuses on the development of highly luminescent europium(iii) complexes in water solution for bioassays, demonstrating the synthesis, photophysical properties analyses, and successful applications of three new Eu(iii) complexes in Homogeneous Time-Resolved Fluorescence (HTRF) assays. The complexes exhibit promising excitation wavelength, overall quantum yield, lifetime, and brightness even at dilute concentrations, making them effective for bioassays. Additionally, bioconjugation with antibodies and successful detection of target molecules in a fluoroimmunoassay were achieved, showing potential in biosensing applications.
ORGANIC & BIOMOLECULAR CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Yuichi Kitagawa, Marina Kumagai, Pedro Paulo Ferreira da Rosa, Koji Fushimi, Yasuchika Hasegawa
Summary: A design for an efficient molecular luminescent thermometer based on long-range electronic coupling in lanthanide coordination polymers was proposed. By controlling the electronic coupling through changing the concentration of Gd-III ion in the coordination polymers, enhanced temperature sensing properties were achieved.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Inorganic & Nuclear
Javier Pitarch-Jarque, Ramon J. Zaragoza, Rafael Ballesteros, Belen Abarca, Enrique Garcia-Espana, Begona Verdejo, Rafael Ballesteros-Garrido
Summary: By transforming neutral heterocycles into their corresponding salts, new water-soluble fluorescent dyes have been successfully prepared, overcoming the issue of low solubility and helping to reveal the nature of anion-pi interactions in water.
DALTON TRANSACTIONS
(2021)
Article
Optics
Qingxian Zou, Fangfang Chen, Guan Peng, Huifeng Zeng
Summary: This study synthesized and characterized four europium (III) complexes with different carboxylate ligands, as well as a binuclear europium-lanthanum complex, and investigated their structural, photophysical, and thermal properties. The results showed that the introduction of lanthanum not only enhances the luminescent intensity, but also improves the ultraviolet aging resistance of the light conversion film.
JOURNAL OF LUMINESCENCE
(2023)
Article
Materials Science, Multidisciplinary
Nafisa A. Abusail, Najat Al Riyami, Rashid Ilmi, Muhammed S. Khan, Nawal K. Al-Rasbi
Summary: Two sets of lanthanide-based coordination polymers (CPs) incorporating 2,5-dihydroxyterephthalic acid (DHTP) and thenoyltrifluoroacetone (TTA) units have been synthesized and characterized. The CPs display 2D zig-zag chain and 2D polymeric structure derived from dinuclear Eu(iii) building blocks. The DHTP ligand shows suitable band structure for luminescence sensitization of Eu(iii). The Eu(iii) polymers exhibit efficient red emission in the solid state with a luminescence intrinsic quantum yield of 52% for Eu2 CP. A light emitting diode (LED) was fabricated using Eu2 CP-silicon oil resin as the emitting layer, which emits pink light with CIE 1931 chromaticity coordinates of (0.437, 0.185).
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Applied
Yun Chen, Jinkai Qiu, Zhao Chen, Yongli Zhao, Bo Li, Chenghui Zeng
Summary: A series of new lanthanide complexes were successfully synthesized using 2,4-difluorobenzoic acid and 1,10-phenanthroline as ligands, with Tb,Eu co-doped complex showing a wide temperature sensing range and high sensitivity.
Article
Materials Science, Multidisciplinary
Manoj Kumar, Savita Khatri, Pratibha Ahlawat, Poonam Kumari, Pooja Hooda, Vaishnavi Lather, V. B. Taxak, S. P. Khatkar, Rajesh Kumar
Summary: Eight co-ordinated Eu(III) complexes were synthesized and characterized for their applications in organic light emitting devices. The study revealed their potential as superior emitters with wide applications in electroluminescent materials, display devices and laser materials.
Article
Biophysics
Rustem R. Zairov, Alexey P. Dovzhenko, Sergey N. Podyachev, Svetlana N. Sudakova, Timur A. Kornev, Anastasiya E. Shvedova, Alexey N. Masliy, Victor V. Syakaev, Ivan S. Alekseev, Ivan M. Vatsouro, Gulnaz Sh. Mambetova, Dmitry V. Lapaev, Irek R. Nizameev, Francesco Enrichi, Andrey M. Kuznetsov, Vladimir V. Kovalev, Asiya R. Mustafina
Summary: The present work introduces self-assembled polystyrenesulfonate (PSS) molecules as soft nanocapsules for incorporation of Eu3+-Sm3+ complexes. The high levels of Eu3+ and Sm3+ luminescence of the complexes derives from the ligand-to-metal energy transfer. The PSS-nanocapsules provide both colloid and chemical stabilization of the ultrasmall nanoprecipitates of the complexes, while their luminescence spectra patterns and excited state lifetimes differ from the values measured for the complexes in DMF solutions.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2022)
Article
Chemistry, Inorganic & Nuclear
Jorge A. A. Coelho, Renaldo T. Moura Jr, Ricardo L. Longo, Oscar L. Malta, Albano N. N. Carneiro Neto
Summary: There is a growing interest in finding alternatives to lanthanide ion (Ln(III))-based luminescence sensitizing chromophores for in vivo applications in optical biological windows. Transition metals (M) are considered as relevant candidates due to their high absorption rates and emission bands covering a wide range of visible to near-infrared spectrum. However, there has been limited research on the energy transfer (ET) processes between M and Ln(III) ions. In this study, a new model incorporating intramolecular energy transfer (IET) and phonon-assisted energy transfer was proposed to predict and explain the photophysical properties driven by the energy transfer between Ln(III) ions and transition metals.
Article
Instruments & Instrumentation
Takayuki Nakanishi, Makoto Tsurui, Jian Xu, Nao Takahashi, Takashi Takeda, Naoto Hirosaki
Summary: The study evaluated the effect of Ca substitution on the luminescence of Cr-doped YSGG garnet and found that Cr4+ broad emission can be improved by Ca substitution to control the photophysical properties. YSGG:Cr4+ with D-2d symmetry in a unique distorted tetrahedron is a promising NIR phosphor for light-emitting applications.
SENSORS AND MATERIALS
(2021)
Article
Chemistry, Physical
Motoshi Sera, Mika Yamamoto, Koji Tomita, Yusuke Yabara, Seiichiro Izawa, Masahiro Hiramoto, Takayuki Nakanishi, Koji Yoshida, Katsura Nishiyama
Summary: In this study, afterglow materials Eu2+, Dy3+@SrAl2O4 were synthesized using liquid-state reaction and surfactant-template method, both of which yielded similar morphologies, emission spectra, and mean afterglow time of approximately 10 seconds.
CHEMICAL PHYSICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Kazutoshi Sekiguchi, Ken-ichi Katsumata, Hiroyo Segawa, Takayuki Nakanishi, Atsuo Yasumori
Summary: The research demonstrates that the particle loading density of silica nanoparticle monolayer arrays on nanoporous anodic aluminum oxide substrates is influenced by particle number concentration, pore size, and the ratio of particle size to pore size. The optimal particle loading density is achieved around a particle size/pore size ratio of 1.5.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Chemistry, Physical
Yuuki Kitagawa, Jumpei Ueda, Jian Xu, Takayuki Nakanishi, Takashi Takeda, Naoto Hirosaki, Setsuhisa Tanabe
Summary: The valence state of Eu ions in inorganic compounds can be easily influenced by the synthesis conditions. This study found that about half of Eu ions in the YSiO2N host were reduced to the divalent state during the sintering process, without any annealing processes. The prepared Eu2+/3+-doped YSiO2N sample showed anomalous deep-red to near-infrared luminescence under violet light illumination, and detailed spectroscopic analyses were conducted to understand its luminescent properties.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Shota Takemura, Yukinori Koyama, Takayuki Nakanishi, Shiro Funahashi, Naoto Hirosaki, Hidekazu Ikeno, Takashi Takeda
Summary: A new narrow-band emitting phosphor K2ZnP2O7:Eu2+ was discovered by extracting promising crystal structures from a database. The synthesized K2ZnP2O7:Eu2+ showed a narrow-band emission at 440 nm with a full width at half maximum of 30 nm.
SCRIPTA MATERIALIA
(2022)
Article
Multidisciplinary Sciences
Pedro Paulo Ferreira da Rosa, Yuichi Kitagawa, Sunao Shoji, Hironaga Oyama, Keisuke Imaeda, Naofumi Nakayama, Koji Fushimi, Hidehiro Uekusa, Kosei Ueno, Hitoshi Goto, Yasuchika Hasegawa
Summary: Soft-crystal copolymerization of Tb(III) and Dy(III) complexes is achieved, and long-range energy transfer from one crystal to the other is studied.
NATURE COMMUNICATIONS
(2022)
Article
Electrochemistry
Akihiro Fujimura, Sunao Shoji, Yuichi Kitagawa, Yasuchika Hasegawa, Takashi Doi, Koji Fushimi
Summary: A quasi-on-time system for analyzing electrode reaction products is developed by combining ICP-OES with a hydrodynamic electrochemical technique. The shorter the distance between the electrode end and the OES detector, the shorter the time response and the higher the detection efficiency (98.1%). Application of this system to analyze reaction species generated from a Cu electrode in a chloride-containing solution demonstrates the effective inhibition of Cu dissolution by adding BTA above a critical concentration of 10 mol m-3.
ELECTROCHIMICA ACTA
(2022)
Article
Chemistry, Physical
Shota Takemura, Yukinori Koyama, Takayuki Nakanishi, Shiro Funahashi, Naoto Hirosaki, Hidekazu Ikeno, Takashi Takeda
Summary: A new narrow-band emitting phosphor Na2Cs2Sr(B9O15)(2):Eu2+ was discovered using the local structure similarity with a known narrow-band emitting phosphor. Na2Cs2Sr(B9O15)(2):Eu2+ showed violet luminescence peaked at 417 nm with a narrow full-width at half-maximum of 26 nm (1497 cm(-1)).
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Sourav Kr. Saha, Tomoya Takano, Koji Fushimi, Masatoshi Sakairi, Ryosuke Saito
Summary: The curing behavior of cement paste and formation of passive film on iron were studied using electrochemical techniques and X-ray photoelectron spectroscopy (XPS). The open circuit potential of iron was monitored in cement paste with a pH of -13 for 56 days, and the results showed that the iron was kept in a passive state. The results of electrochemical impedance spectroscopy revealed an increasing trend of film and cement paste resistance with curing time. XPS analysis provided evidence that the formation of ferric hydroxide and ferric oxide was efficient in passivating the iron. The iron surface receded from corrosion due to the high-alkaline environment of cement paste and the formation of a passive film.
SURFACES AND INTERFACES
(2023)
Article
Electrochemistry
K. Fushimi, H. Yanagimoto, S. Nakatsuji, S. Shoji, Y. Kitagawa, Y. Hasegawa, K. Baba
Summary: A liquid-phase ion gun (LPIG) was used to create a local H2S enriched environment near the surface of Cr-containing steel in Na2S solutions, aiming to induce sulfide stress cracking on the specimen surface. Acidification of the local solution below pH 4, creating a pseudo-sour environment, was achieved by anodically polarizing the LPIG Pt microelectrode at a potential of 1.90 V vs SHE in a 1.5 mM Na2S solution. Under this pseudo-sour environment, sulfides were formed on the specimen surface depending on the concentration of Cr, specimen potential, and chloride ion in solution. When subjected to tensile stress and operated with LPIG, cracks were formed on the surface of Cr-containing steels using a four-point bending tester.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Takayuki Nakanishi, Yuichi Hirai, Jian Xu, Takashi Takeda, Shunsuke Watanabe, Atsuo Yasumori, Shou Hakamada, Yuichi Kitagawa, Yasuchika Hasegawa
Summary: Luminescent lanthanide coordination polymer crystals (LCPCs) are of great interest in materials chemistry due to their unique and customizable functional properties. These crystals offer a high degree of structural tunability, including size- and morphology-dependent properties, making them promising materials for various applications such as light emitting diodes.
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Yuichi Hirai, Stann Van Baaren, Takahito Ohmura, Takayuki Nakanishi, Takashi Takeda, Yuichi Kitagawa, Yasuchika Hasegawa, Remi Metivier, Clemence Allain
Summary: In pursuit of new mechanically responsive luminescent materials, the study aims to differentiate triboluminescence (TL) from photoluminescence (PL). A beta-diketonate ligand with tert-butyl groups is used to quench Eu-III-centered PL and provide efficient photosensitization of Tb-III ions. Nanomechanical tests reveal the ductility of the crystals, making them ideal for accumulating deformation energy before breakage. Additionally, the study investigates the TL/PL color difference and mechanochromic luminescence (MCL) in a Tb-III/Eu-III heterodinuclear complex.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Yuichi Kitagawa, Kaori Shima, Takuma Nakai, Marina Kumagai, Shun Omagari, Pedro Paulo Ferreira da Rosa, Sunao Shoji, Koji Fushimi, Yasuchika Hasegawa
Summary: In this study, a photosensitizer design strategy using a dinuclear luminescent lanthanide complex was demonstrated, which exhibited thermally-assisted photosensitized emission. The complex consisted of Tb(III) ions, six tetramethylheptanedionates, and a phosphine oxide bridge containing a phenanthrene frameworks. The phenanthrene ligand and Tb(III) ions acted as the energy donor and acceptor parts, respectively. The efficient thermally-assisted photosensitized emission of the Tb(III) acceptor resulted in a pure-green colored emission with a high photosensitized emission quantum yield of 73%.
COMMUNICATIONS CHEMISTRY
(2023)
Article
Chemistry, Physical
Shota Takemura, Yukinori Koyama, Takayuki Nakanishi, Shiro Funahashi, Naoto Hirosaki, Hidekazu Ikeno, Takashi Takeda
Summary: In this study, a new narrow-band emitting phosphor Na2Cs2Sr(B9O15)2:Eu2+ was discovered by analyzing the local structure similarity with a known narrow-band emitting phosphor. The synthesized phosphor exhibited a narrow peak emission at 417 nm and showed violet luminescence.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Yuichi Kitagawa, Ayu Naito, Koji Fushimi, Yasuchika Hasegawa
Summary: The study demonstrates the first pure sky-blue fluorescence from a lutetium-based coordination polymer with diphenyl-anthracene derivative, which is attributed to the tightly packed crystal structure and multiple CH-F interactions within the coordination polymer.
