Article
Chemistry, Analytical
Tao Cai, Dongfang Li, Juyong Jung, Mirae Kim, Chung-Hwan Jeon, Kyung Chun Kim
Summary: In this study, a two-dimensional visualization of the oxygen concentration field in a high-temperature environment was achieved using the phosphorescence of Y2O3:Eu3+. The spectrum and decay time of the phosphorescence were found to be directly related to the oxygen concentration. Measurements based on phosphorescence intensity and decay lifetime were demonstrated, showing the powerful application capability of oxygen concentration measurement at a high-temperature environment based on the phosphorescence of Y2O3:Eu3+.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Applied
Zheng-Yu Tao, Ze-Hui Pan, Ying-Jie Wang, Tian-Ling Fu, Hui-Hui Xu, Qian-Feng Zhang, Bi-Hai Tong, Man-Keung Fung, Yong-Pan Tian
Summary: In this study, a series of red iridium complexes with steric hindrance groups were synthesized and their performance was investigated. The results showed that increasing the density of steric hindrance groups effectively prevented molecular aggregation and improved the photoluminescence quantum yield and thermal stability of the devices. The device based on Ir1 complex exhibited the highest efficiency, with good current efficiency and external quantum efficiency, and showed low efficiency roll-off.
Article
Chemistry, Inorganic & Nuclear
Merve Zeyrek Ongun, Murat Sahin, Sibel Oguzlar, Tugce Akbal Aytan, Sevinc Zehra Topal, Devrim Atilla
Summary: In this study, new bis-cyclometalated iridium (III) complexes with different ligated groups were synthesized and their oxygen sensing properties were investigated. The results showed that the oxygen sensitivity of the complexes can be fine-tuned by varying the ligated groups, and the weak electron-donating properties of the methyl groups at the aryl moiety significantly improve the optical oxygen sensing abilities of the iridium (III) complexes.
INORGANICA CHIMICA ACTA
(2022)
Article
Biochemistry & Molecular Biology
Leonid N. Bochkarev, Yulia P. Parshina, Yana Gracheva, Tatyana A. Kovylina, Svetlana A. Lermontova, Larisa G. Klapshina, Aleksey N. Konev, Mikhail A. Lopatin, Maria M. Lukina, Anastasia D. Komarova, Vladislav Shcheslavskiy, Marina Shirmanova
Summary: New water-soluble polynorbornenes containing luminophoric complexes of iridium(III) were synthesized, showing intense photoluminescence and non-toxic properties in biological testing. These polymers have potential for assessing oxygen levels in biological tissues.
Article
Chemistry, Analytical
Tao Cai, Juyong Jung, Dongfang Li, Mirae Kim, Chung-Hwan Jeon, Kyung Chun Kim
Summary: In this study, a simultaneous sensing technique of oxygen and temperature is proposed in order to accurately quantify oxygen concentration in high-temperature environments. By studying the rise and decay behavior of phosphorescence, a binary equation model is established to obtain temperature and oxygen concentration information. Experimental results demonstrate that quantitative two-dimensional sensing of oxygen concentrations in high-temperature environments can be achieved using only UV light and a high-speed camera.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Inorganic & Nuclear
Himani Thakur, Sachin Singh, Arvind K. Gathania, Sunil Kumar Singh, Ishant Kumar, Rajesh Kumar Singh
Summary: A series of Li+-codoped YVO4:Tm3+/Yb3+ phosphors were prepared using the Pechini sol-gel reaction technique. The Li+ doping significantly increased the upconversion emission intensities and proved to be efficient for temperature sensing. These materials have potential applications in light-emitting diodes and temperature sensing probes.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Toshitada Yoshihara, Nao Matsumura, Takuto Tamura, Shuichi Shiozaki, Seiji Tobita
Summary: Simultaneous imaging of intracellular and blood oxygen levels in tissues using newly developed O2 probes allowed for the evaluation of dynamic behavior of molecular oxygen in normal and diseased tissues. The study demonstrated that certain complexes showed higher cellular uptake efficiency and oxygen sensitivity, enabling cellular-level resolution imaging of acinar cells and capillaries in the pancreas.
Article
Chemistry, Inorganic & Nuclear
Anik Sahoo, Toushique Ahmed, Sourav Deb, Sujoy Baitalik
Summary: The anion and pH-sensing behaviors of a Ru(II)-bipyridine complex with dissociable protons in its secondary coordination sphere are used to create multiple Boolean and fuzzy logic systems. Changes in anions and pH significantly modulate the absorption, emission, and electrochemical behaviors of the metalloreceptor. The protonation-deprotonation behaviors of the metalloreceptor can be reversed and repeated multiple times, allowing it to demonstrate advanced Boolean functions.
INORGANIC CHEMISTRY
(2022)
Article
Environmental Sciences
Dechao Xu, Boping Yu, Xingxing Lu, Sushuang Luo, Weimian Wang, Yonghui Zeng, Xingliang Jin, Zhiguang Dai
Summary: A novel three-stage treatment process was developed for advanced defluoridation from industrial wastewater with high-concentration fluoride, achieving removal efficiency as high as 90.6%. This process eliminates the need for coagulant addition, reduces sludge production, and allows for the reuse of residual reagents to decrease reagents dosage during the treatment process.
WATER AND ENVIRONMENT JOURNAL
(2021)
Article
Chemistry, Physical
Hyun-Jun Lee, Abasi Abudulimu, Juan Carlos Roldao, Hyunwoo Nam, Johannes Gierschner, Larry Lueer, Soo Young Park
Summary: A highly efficient photocatalytic system for hydrogen evolution was developed using self-assembled nanoparticles based on an octupolar molecule. The addition of halide ions improved the rate of hydrogen evolution reaction due to the external heavy atom effect enhancing intersystem crossing. The highest hydrogen evolution rate of the system reached 460 mmol/g.h with the presence of iodide ions and a metal co-catalyst. Moreover, the photocatalytic system without any halide ion additives showed remarkable efficiency in hydrogen generation from seawater using stimulated sunlight (apparent quantum yield of about 3.8%).
Article
Chemistry, Physical
Govardhana Babu Bodedla, Venkatesh Piradi, Muhammad Imran, Jianzhang Zhao, Xunjin Zhu, Wai-Yeung Wong
Summary: In this study, two new A-pi-D-pi-A porphyrins, ZnP-CPDT and ZnP-BT, were synthesized and characterized as visible-to-near-infrared light-harvesting photosensitizers. The porphyrins exhibited absorption in the range of 370 to 800 nm in solution and 300 to 1100 nm in the solid state. The Soret- and Q-band absorption peaks of ZnP-CPDT were more red-shifted than those of ZnP-BT due to enhanced intramolecular charge transfer. Additionally, ZnP-CPDT showed better photoinduced charge separation and well-defined nanosphere morphology, resulting in a higher photocatalytic hydrogen evolution rate compared to ZnP-BT and a typical zinc(ii)-tetraphenylporphyrin.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Materials Science, Multidisciplinary
Jiaxiang Liu, Baowen Wang, Zhiming Zhang, Jiamiao Yu, Xingqiang Lue, Guorui Fu, Wentao Li, Wai-Yeung Wong
Summary: Using the designed chiral emitter [Sm(tta)(3)(d-phen)], the first example of a chiral organo-lanthanide(III) complex-based CP-WOLED with both attractive white-light efficiencies (η(Max)(EQE) = 1.55% and η(Max)(CE) = 1.61 cd·A(-1)) and high dissymmetry factor (|g(EL)|(Max) = 0.011) is reported.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Chen Zhang, Linli Xu, Wai-Yeung Wong
Summary: Polymetallaynes are a promising branch of metallopolymers with unique skeletons and versatile properties. Both one-dimensional and two-dimensional polymetallaynes have attracted considerable attention due to their excellent electronic, optical, and magnetic properties. The research on molecular metallaynes provides insights for understanding structure-property-activity relationships in organometallic acetylide-containing systems. Recent progress in polymeric and molecular metallaynes containing platinum, mercury, and gold is discussed, highlighting their emerging applications in various fields.
CHINESE JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Applied
Seung Hwa Hong, Dong Won Kim, Soo Young Park
Summary: We propose an eco-friendly aqueous process to obtain efficient/stable small molecule organic field effect transistors (OFETs). Penta-ethylene glycol (PEG) side chains were introduced to the rigid backbone structures of indolo[3,2-b]indole(IDID), leading to the formation of PEG-IDIDF. The addition of water as a cosolvent significantly enhances the film crystallinity and molecular stacking orientation of PEG-IDIDF, resulting in improved hole mobility and current on/off ratio for the PEG-IDIDF OFETs processed with ethanol water cosolvent (90:10) ratio.
Article
Biochemistry & Molecular Biology
P. -L. Lam, R. Gambari, Y. -W. Ho, W. -Y. Wong, D. K. -P. Hau, T. W. -T. Leung, P. H. -M. Leung, C. -H. Chui
Summary: This study reports the development of a safe microparticulate system using agar and gelatin as wall matrix materials for the topical delivery of corilagin to combat MRSA. The results demonstrate the potential of corilagin-loaded gelatin/agar microspheres for applicable bio-textile products to treat drug-resistant bacterial infections.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Review
Materials Science, Multidisciplinary
He Jiang, Peng Tao, Wai-Yeung Wong
Summary: Efficient and stable blue organic light-emitting devices (OLEDs) are crucial for future solid-state lighting and full color displays. Triplet-triplet annihilation (TTA)-based materials have shown promise in achieving high efficiency and stability in blue OLEDs. This review comprehensively presents recent advances in molecular design strategies, photophysical properties, electroluminescence mechanisms, and OLED applications of TTA-based materials. It also discusses future research opportunities in this field. The emerging TTA-based materials have the potential to provide new opportunities for high-efficiency and stable blue electroluminescence.
ACS MATERIALS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Siyang Feng, Liangxuan Wang, Begona Milian-Medina, Alfred J. Meixner, Min Sang Kwon, Soo Young Park, Reinhold Wannemacher, Johannes Gierschner
Summary: The complex photokinetics of donor-acceptor-donor triads with varying flexible spacer lengths were investigated. Both liquid and solid solutions, as well as crystals, were studied using fluorescence spectroscopy and computational analysis. The study revealed dynamic charge-transfer state formation in liquid solutions and fluorescent CT static complexes in solid solutions. It was also found that external stimuli could induce on/off fluorescence switching or change the emission color in films of the triads.
ADVANCED MATERIALS
(2023)
Article
Optics
Minting Ouyang, Runda Guo, He Jiang, Lei Wang, Wai-Yeung Wong
Summary: Two new emitters based on anthracene core have been designed and synthesized for blue and deep blue OLEDs. The hot exciton and hybrid local and charge transfer properties of these molecules contribute to their high exciton utilization efficiencies. The CIE coordinate of CNPhAnPy approaches the NTSC standard index for pure blue emission.
JOURNAL OF LUMINESCENCE
(2023)
Article
Chemistry, Organic
Biquan Xiong, Lulu Si, Longzhi Zhu, Yu Liu, Weifeng Xu, Ke-Wen Tang, Shuang-Feng Yin, Peng-Cheng Qian, Wai-Yeung Wong
Summary: A copper-catalyzed aerobic oxidative/decarboxylative phosphorylation of aryl acrylic acids with P(III)-nucleophiles via the Michaelis-Arbuzov rearrangement is reported. The reaction can be carried out effectively without the use of a ligand and a base. Various aryl acrylic acids and P(III)-nucleophiles are compatible in this transformation, providing β-keto-organophosphorus compounds with good to excellent yields. The possible mechanism and kinetic studies show that this transformation may proceed through second-order chemical kinetics and involves a radical process.
JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Govardhana Babu Bodedla, Muhammad Imran, Jianzhang Zhao, Xunjin Zhu, Wai-Yeung Wong
Summary: In this study, TPE-ZnPF was successfully synthesized and characterized by single-crystal X-ray diffraction. TPE-ZnPF aggregates exhibit long-lived photoexcited states, and enhance emission intensity through suppression of non-radiative decay channels. Moreover, TPE-ZnPF aggregates show more efficient light-harvesting ability, well-defined nanosphere morphology, and more efficient photoinduced charge separation compared to Ph-ZnPF aggregates. As a result, TPE-ZnPF aggregates demonstrate an excellent photocatalytic hydrogen evolution rate of 56.20 mmol g(-1) h(-1), which is 94-fold higher than that of Ph-ZnPF aggregates without TPE groups.
Article
Materials Science, Multidisciplinary
Wansu Zhang, Shangyu Chen, Shuai Ye, Pengfei Sun, Quli Fan, Jun Song, Pengju Zeng, Jun-Le Qu, Wai-Yeung Wong
Summary: Phosphorescence probes have shown great potential as hypoxia detectors due to their long luminescence lifetime, large Stokes shift, and oxygen sensitivity. However, the low quantum yields of organic phosphorescence probes in the NIR-II window hinder their development in NIR-II hypoxia imaging. This study presents a new NIR-II phosphorescence probe based on phosphorescence resonance energy transfer (PRET) strategy, which exhibits high quantum yield and brightness in both normoxic and oxygen-free environments. In vivo tumor hypoxia imaging experiments demonstrate the high performance of the probe in terms of brightness and signal-to-background ratio.
ACS MATERIALS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Pengfei She, Zhong Zheng, Yanyan Qin, Feiyang Li, Xiaokang Zheng, Dongdong Zhang, Zhiyuan Xie, Lian Duan, Wai-Yeung Wong
Summary: An effective strategy for engineering the phosphorescence colors of tetrahedral Mn(II) complexes through steric hindrance-driven bond angle distortion is proposed. Modulating the steric hindrance between phosphine and benzofuran and varying the OMnO bond angles allows these Mn(II) complexes to emit from 498 to 548 nm.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Organic
Wenli Shang, Longzhi Zhu, Zikang Li, Weifeng Xu, Biquan Xiong, Yu Liu, Ke-Wen Tang, Peng-Cheng Qian, Shuang-Feng Yin, Wai-Yeung Wong
Summary: A simple and efficient method for the ruthenium-catalyzed 1,6-hydroalkylation of para-quinone methides with ketones via in situ activation of C-(sp(3))-H bonds has been disclosed. This method demonstrates good substrate tolerance and moderate to good yields of the desired 1,6-hydroalkylation products.
JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Rashid Ilmi, Xiaofang Li, Nawal K. Al Rasbi, Liang Zhou, Wai-Yeung Wong, Paul R. Raithby, Muhammad S. Khan
Summary: Two new organo-europium complexes were synthesized and characterized, and they were used to fabricate red organic light emitting diodes. Exceptional device performance was achieved through device engineering optimization.
DALTON TRANSACTIONS
(2023)