Article
Chemistry, Physical
Robin Giereth, Philipp Lang, Ewan McQueen, Xenia Meissner, Beatrice Braun-Cula, Carla Marchfelder, Martin Obermeier, Matthias Schwalbe, Stefanie Tschierlei
Summary: Researchers synthesized a homobimetallic rhenium(I) compound that significantly increased catalytic performance, and shed light on crucial intermediates in the reaction cycle through photocatalytic experiments, spectroelectrochemical experiments, and spectroscopic investigations under (photo)catalytic conditions.
Review
Chemistry, Inorganic & Nuclear
Christina Wegeberg, Oliver S. Wenger
Summary: This article highlights recently discovered chromium(0) and manganese(i) complexes emitting from metal-to-ligand charge transfer excited states, with MLCT lifetimes in the nanosecond regime. Although luminescence quantum yields are comparatively low, the photophysical properties provide insight for the further development of new luminescent first-row transition metal complexes.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Inorganic & Nuclear
Liam J. J. Stephens, Elena Dallerba, Jenisi T. A. Kelderman, Aviva Levina, Melissa V. V. Werrett, Peter A. A. Lay, Massimiliano Massi, Philip C. C. Andrews
Summary: This study synthesized and characterized twelve Re(i) tricarbonyl diimine complexes with thiotetrazolato ligands. The tetrazolato ligand can bind to the Re(i) center through either the S atom or the N atom, with most complexes being bound to the N atom. In solution, the complexes exist as an equilibrating mixture of linkage isomers. The complexes exhibit photoluminescent properties, with emission wavelengths dependent on the nature of the diimine ligand.
DALTON TRANSACTIONS
(2023)
Article
Biochemistry & Molecular Biology
Egor M. Baranovskii, Victoria V. Khistiaeva, Konstantin V. Deriabin, Stanislav K. Petrovskii, Igor O. Koshevoy, Ilya E. Kolesnikov, Elena V. Grachova, Regina M. Islamova
Summary: This study synthesized hybrid luminescent polysiloxanes and silicone rubbers grafted by organometallic rhenium(I) complexes using Cu(I)-catalyzed azido-alkyne cycloaddition. The examination of photophysical properties shows that emission profile of Re(I) moiety remains unchanged and metallocenter allows to control the creation of polysiloxane-based materials with specified properties.
Article
Chemistry, Inorganic & Nuclear
Agnieszka Puzan, Mikolaj Zychowicz, Junhao Wang, Jakub J. Zakrzewski, Mateusz Reczynski, Shin-ichi Ohkoshi, Szymon Chorazy
Summary: The interest in the generation of photoluminescence in lanthanide(III) single-molecule magnets (SMMs) is driven by valuable magneto-optical correlations as well as perspectives toward magnetic switching of emission and opto-magnetic devices linking SMMs with optical thermometry. These effects were analysed using ac magnetic data and the results of the ab initio calculations with the support of magneto-optical correlations based on low-temperature high-resolution emission spectra.
DALTON TRANSACTIONS
(2021)
Review
Chemistry, Multidisciplinary
Christian Sandoval-Pauker, Mireya Santander-Nelli, Paulina Dreyse
Summary: This work describes the photophysical characteristics of [Cu(N boolean AND N)(2)](+) and [Cu(N boolean AND N)(P boolean AND P)](+) complexes, as well as the concept and development of thermally activated delayed fluorescence (TADF). The importance of Delta E-(S1-T-1) and spin-orbital coupling (SOC) values on the TADF behavior of these complexes is discussed. Examples of Delta E-(S1-T-1) values reported in the literature are collected and trends are proposed. The methods used for determining Delta E-(S1-T-1) values and the effect of SOC in TADF are also described. Lastly, the applications and challenges for industrial use of these TADF complexes are addressed.
Article
Chemistry, Inorganic & Nuclear
Yongyi Feng, Shun-Cheung Cheng, Chi-Chiu Ko
Summary: In this study, a cyanopentafluorophosphate ligand with exceptional pi-accepting ability was synthesized, showing promise in the design of fluorescent materials and catalysts.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Udit Kumar, Buthanapalli Ramakrishna, Jisna Varghese, Pitchavel Vidhyapriya, Natarajan Sakthivel, Bala Manimaran
Summary: The synthesis of selenolato-bridged manganese(I)-based metallorectangles through supramolecular one-step self-assembly process involved oxidative addition and coordination reactions, with their formation confirmed using various analytical techniques. The strong binding interactions between the metallorectangles and aromatic guests were studied, and the host-guest complex formation was explicitly corroborated by single-crystal X-ray structure analysis. Additionally, the anticancer activity of select metallorectangles and the CO-releasing ability of one metallorectangle were explored in this study.
INORGANIC CHEMISTRY
(2021)
Review
Materials Science, Multidisciplinary
Catherine E. Housecroft, Edwin C. Constable
Summary: The surge of interest in the emissive behavior of copper(I) coordination compounds, particularly in relation to the possibility of thermally activated delayed fluorescence (TADF), has been a notable development in the past decade. This review primarily focuses on Cu-iTMCs and highlights the advancements in the field of luminescent compounds and those exhibiting TADF.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Xiurong Ma, Junjian Lu, Peixin Yang, Bo Huang, Rongtao Li, Ruirong Ye
Summary: This study synthesized and characterized two new heteronuclear Ru(II)-Re(I) metal complexes and evaluated their anticancer activity and mechanisms. The results showed that these complexes exhibited high anticancer activity and certain selectivity towards human cancer cells. Additionally, they induced apoptosis through various pathways and inhibited cell migration and colony formation.
FRONTIERS IN CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Cedric Uhlmann, Thomas J. Feuerstein, Tim P. Seifert, Andre P. Jung, Michael T. Gamer, Ralf Koeppe, Sergei Lebedkin, Manfred M. Kappes, Peter W. Roesky
Summary: The versatile metalloligand was converted into early-late heterotetrametallic complexes, which showed photoluminescence with either remarkably different or similar features compared to related solely coinage metal containing acetylide amidinate complexes.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Inorganic & Nuclear
Mario Pacheco, Javier Gonzalez-Platas, Miguel Julve, Francesc Lloret, Carlos Kremer, Alicia Cuevas
Summary: Three new heterobimetallic complexes were synthesized using NBu4[Re(NO)Br4(H2pydc)] as a precursor, and their crystal structures and magnetic properties were investigated. The compounds exhibit unique coordination environments and weak antiferromagnetic interactions.
Article
Chemistry, Multidisciplinary
Renato Rabelo, Luminita Toma, Nicolas Moliner, Miguel Julve, Francesc Lloret, Mario Inclan, Enrique Garcia-Espana, Jorge Pasan, Rafael Ruiz-Garcia, Joan Cano
Summary: This study investigates two octahedral cobalt complexes and reveals their ability to exhibit selective functions under external stimuli. The pH isomerism of these complexes shows reversible changes in luminescence, redox, and magnetic properties, both in solution and solid state. The fine-tuning of these properties offers exciting possibilities for advanced magnetic devices in molecular nanoscience and nanotechnology.
Article
Chemistry, Inorganic & Nuclear
Ricardo J. Fernandez-Teran, Laurent Severy
Summary: Six rhenium(I) kappa N-3-dicarbonyl complexes with 4'-(4-substituted phenyl)terpyridine ligands were studied in their ground and excited states, showing panchromatic absorption and strong photoreductant properties. Remote substitution in the ligand framework systematically affected the properties of the complexes, with TRIR spectroscopy revealing metal-to-ligand charge transfer character in the lowest singlet and triplet excited states. Insights gained from analyzing the geometric and electronic effects provide valuable information for designing complexes with long-lived triplet excited states and enhanced absorption throughout the visible spectrum.
INORGANIC CHEMISTRY
(2021)
Review
Energy & Fuels
Vonika Ka-Man Au
Summary: Over the past decade, OLED technology has made rapid progress and shown promising prospects for application. In addition to optimizing device structures, the search for new types of emitters, such as copper(I) self-assembled materials, has become equally important.
Article
Chemistry, Inorganic & Nuclear
Bi-Shun Hou, Li-Xin Wang, Longji Zhang, Dong Xiang, Chi-Fai Leung, Jing Xiang
Summary: A series of luminescent Pb2+ complexes with different architectures have been synthesized and characterized. Their crystal structures have been determined and the phase purity has been confirmed. The solid-state UV-visible reflectance spectra and luminescence properties of these complexes have been investigated. DFT calculations have been carried out to decipher the emission origin.
Article
Chemistry, Multidisciplinary
Jing Xiang, Yi Pan, Lu-Lu Liu, Li-Xin Wang, Huan Yang, Shun-Cheung Cheng, Shek-Man Yiu, Chi-Fai Leung, Chi-Chiu Ko, Kai-Chung Lau, Tai-Chu Lau
Summary: Although the oxidation of alcohols by metal nitrido complexes has not been studied extensively, this report demonstrates the visible-light-induced oxidation of primary and secondary alcohols to carbonyl compounds using a strongly luminescent osmium(VI) nitrido complex (OsN). The proposed mechanism involves the rate-limiting hydrogen-atom transfer from the alpha-carbon of the alcohol to OsN*. Attempts to catalytically oxidize alcohols by OsN* using PhIO as the terminal oxidant resulted in the formation of novel osmium(IV) iminato complexes where the nitrido ligand is bonded to a 6-carbon of the alcohol. Experimental and theoretical studies suggest that OsN* is reductively quenched by PhIO to generate highly active PhIO+ oxidant, which readily undergoes alpha- and 6- C-H activation of alcohols.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Wing-Kei Kwok, Lok-Kwan Li, Shiu-Lun Lai, Ming-Yi Leung, Wai Kit Tang, Shun-Cheung Cheng, Man-Chung Tang, Wai-Lung Cheung, Chi-Chiu Ko, Mei-Yee Chan, Vivian Wing-Wah Yam
Summary: A new class of gold(III) complexes containing acridinyl moieties and tetradentate C<^>C<^>N<^>N ligand has been designed and synthesized, which exhibit high photoluminescence quantum yields in solid-state thin films. These complexes have been utilized to fabricate high-performance OLEDs with high external quantum efficiencies and satisfactory operational half-lifetime values. The TADF properties of the complexes have been substantiated by various experimental techniques.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Inorganic & Nuclear
Rain Ng, Shun-Cheung Cheng, Ka-Lok Chan, Cheuk-Pui Leung, Wai-Man Cheung, Herman H. -Y. Sung, Hung Kay Lee, Chi-Chiu Ko, Ian D. Williams, Zhenyang Lin, Wa-Hung Leung
Summary: In this study, iridium complexes containing a bis-cyclometalated tripodal CANAC ligand were synthesized and their redox property and reactivity were investigated. Various iridium complexes were successfully obtained through different reactions, and their structures and properties were further studied. The results highlighted the crucial role of the CANAC ligand in stabilizing high-valent iridium.
Article
Chemistry, Physical
Pui-Yu Ho, Shun-Cheung Cheng, Fei Yu, Yau-Yuen Yeung, Wen-Xiu Ni, Chi-Chiu Ko, Chi-Fai Leung, Tai-Chu Lau, Marc Robert
Summary: We present an efficient visible light-driven CO2 reduction system that operates in water without the use of noble metals or rare materials. By employing a cobalt complex as a catalyst, an organic triazatriangulenium salt as a photosensitizer, and BIH + TEOA as a sacrificial reductant, we achieved CO and formate production with high selectivity and total turnover numbers exceeding 3700. The addition of a weak Brönsted acid further improved the catalysis, resulting in a selectivity of 93% and a total turnover number of 19,000 for CO production. The photocatalytic system demonstrated excellent performance even in pure water, with a turnover number of 2600 and a selectivity of 94% using TEA as the sacrificial reductant.
Review
Chemistry, Analytical
Ruoyang Liu, Chi-Chiu Ko
Summary: MIP-based luminescent chemosensors have been widely studied due to their high specificity and sensitivity in molecular recognition and luminescence detection. Different strategies, including incorporation of luminescent functional monomers and surface-imprinting polymerization on luminescent nanomaterials, have been used to construct luminescent MIPs for various analytes. This review discusses the design strategies, sensing approaches, and applications of luminescent MIP-based chemosensors in biosensing, bioimaging, food safety, and clinical diagnosis, as well as the limitations and prospects for future development.
Article
Engineering, Marine
Yi Yang, Tze W. Chow, Yi Q. Zhang, Peter K. N. Yu, Chi C. Ko, Rudolf S. S. Wu
Summary: Existing methods for monitoring radionuclides in aquatic environments are often impractical due to the need for frequent sampling and tedious analytical procedures. This study explored the feasibility of using 'Artificial Mussels' (AMs) as a new tool for radionuclide monitoring in marine environments. Results showed that AMs could effectively accumulate U-238, Sr-88, and Cs-133 from water, reaching equilibrium within 7 to 8 weeks with high concentration factors. These findings suggest that AMs can overcome the limitations of existing methods and offer a practical solution for radionuclide monitoring.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Review
Chemistry, Multidisciplinary
Shing-Lun Chan, Yuen-Kiu Chun, Chi-Chiu Ko
Summary: Transition-metal acyclic carbene complexes have gained attention due to their comparable properties with N-heterocyclic carbene (NHC) ligands. These complexes show outstanding performance and functional properties, making them alternatives to NHC complexes for developing metal-based functional materials. The substituents and micro-environment significantly affect their structure and electronic properties, allowing for varied functional properties through rational molecular design. They are also suitable for stimuli-responsive materials and chemical sensors. This article describes the preparation, electronic properties, and design of metal acyclic carbene complexes for advanced materials development.
MATERIALS CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Inorganic & Nuclear
Ruoyang Liu, Shun-Cheung Cheng, Chi-On Ng, Yelan Xiao, Kin-Man Tang, Ka-Ming Tong, Ngai-Yu Lei, Chi-Chiu Ko
Summary: A luminescent sensor for detecting trimethylamine (TMA) has been developed using a polymer with immobilized phosphorescent material. The sensor can rapidly and selectively detect TMA in both aqueous solutions and gaseous states, with low detection limits.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Inorganic & Nuclear
Li-Xin Wang, Shun-Cheung Cheng, Yingying Liu, Chi-Fai Leung, Ji-Yan Liu, Chi-Chiu Ko, Tai-Chu Lau, Jing Xiang
Summary: A series of new copper(I) complexes have been synthesized and characterized. These complexes exhibit tunable emission spectra in solution and their molecular structures have been determined by X-ray crystallography. Density functional theory calculations reveal the characteristics of these complexes.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Multidisciplinary
Cathay Chai Au-Yeung, Ming-Yi Leung, Shiu-Lun Lai, Shun-Cheung Cheng, Lok-Kwan Li, Man-Chung Tang, Wing-Kei Kwok, Chi-Chiu Ko, Mei-Yee Chan, Vivian Wing-Wah Yam
Summary: A new class of gold(III) complexes with pyridine-/pyrazine-containing tetradentate ligands has been synthesized and characterized. These complexes exhibit high photoluminescence quantum yields in solid-state thin films and a significant increase in radiative decay rate constant upon increasing temperature. The activation parameters and energy separation values between excited states were determined. Furthermore, strategic modification of the ligand structure can enhance the alignment of the emitting layer and improve the efficiency and performance of organic light-emitting devices.
MATERIALS HORIZONS
(2023)
Article
Chemistry, Inorganic & Nuclear
Ruoyang Liu, Shun-Cheung Cheng, Chi-On Ng, Yelan Xiao, Kin-Man Tang, Ka-Ming Tong, Ngai-Yu Lei, Chi-Chiu Ko
Summary: A luminescent TMA sensor, PTMA-Ir, was developed by immobilizing a phosphorescent iridium complex on a TMA-imprinted polymer. The quenching of PTMA-Ir's phosphorescence could be used as a reporter for TMA binding, allowing for sensitive and selective detection of TMA in aqueous solutions and gaseous states. A deposition T-Ir loaded on filter paper showed a rapid quenching of phosphorescence upon exposure to TMA vapor, with low detection limits in both argon and air atmospheres.
DALTON TRANSACTIONS
(2023)