Article
Biochemistry & Molecular Biology
Alfonso Annunziata, Paola Imbimbo, Maria Elena Cucciolito, Giarita Ferraro, Vincenzo Langellotti, Alessandra Marano, Massimo Melchiorre, Gabriella Tito, Marco Trifuoggi, Daria Maria Monti, Antonello Merlino, Francesco Ruffo
Summary: This study presents new platinum(II) cationic five-coordinate complexes with different alkyl and imidazole-based NHC-carbene ligands. These complexes exhibit stability in both DMSO and aqueous solvents. Hydrophobicity studies showed their potential as anticancer drugs, as they were internalized in cancer cells and induced apoptosis. Reactivity studies revealed the compound's ability to bind with DNA and interact with model protein lysozyme, maintaining its five-coordinate geometry.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Review
Chemistry, Inorganic & Nuclear
Awal Noor
Summary: Stabilization of transition metals in unusually low coordination numbers has been a challenging area of interest in coordination chemistry. The use of appropriate sterically bulky ligands enables the isolation and exploration of such rare species, allowing for the study of their bonding and chemical reactivity. The fine tuning of ligand design, balancing bulk and electronic effects, plays a crucial role in determining their reactivity. Despite synthetic difficulties, the isolation and characterization of these low coordinate transition metal complexes have received significant attention in recent years. This review discusses the synthetic approaches and the establishment of their geometric and electronic structures using advanced spectroscopic techniques in the past decade.
COORDINATION CHEMISTRY REVIEWS
(2023)
Article
Chemistry, Inorganic & Nuclear
Eva Zahradnikova, Ivana Cisarova, Bohuslav Drahos
Summary: In this work, the preparation and characterization of three manganese(II) complexes with structurally-new pyridine-based macrocyclic ligands are presented. X-ray diffraction analysis confirmed a coordination number seven with a close to pentagonal bipyramid geometry for all complexes studied.
Article
Chemistry, Inorganic & Nuclear
Olaya Gomez-Paz, Rosa Carballo, Ana B. Lago, Inmaculada Prieto, Ezequiel M. Vazquez-Lopez
Summary: Three coordination compounds were synthesized and characterized from the reaction of copper(ii) bromide with the flexible bis-tetrazole organosulfur ligand, 1,2-bis(1-methyl-1H-tetrazole-5-ylthio)ethane (bmtte). Different reaction conditions led to the formation of polymeric 2 & INFIN;Cu2Br4(bmtte) (1), trinuclear [Cu3Br4(bmtte)(2)] (2), and tetranuclear [Cu2Br2(bmtte)](2) (3) compounds with different structures. The thermal stability, aqueous behavior, and reactivity of the compounds were investigated, and a new polymeric compound (8Cu4I4)-Cu-2(bmtte)(2) (4) was prepared through solid-state reaction and microwave irradiation. The redox behavior of the compounds was analyzed by cyclic voltammetry.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Inorganic & Nuclear
Subhi A. Al-Jibori, Ahmed S. Al-Janabi, Ahmed A. Irzoqi, Ali I. A. Abdullah, Sucharita Basak-Modi, Georgia R. F. Orton, Shishir Ghosh, Christof Wagner, Graeme Hogarth
Summary: A series of Pd(ii) complexes containing ortho-cyano-aminothiophenolate (ocap) ligands have been prepared and their molecular structures elucidated. Different mono- and bi-nuclear complexes with different coordination geometries of the ocap ligand were obtained through various reactions.
DALTON TRANSACTIONS
(2022)
Review
Chemistry, Physical
Cristina Cebrian, Mariachiara Pastore, Antonio Monari, Xavier Assfeld, Philippe C. Gros, Stefan Haacke
Summary: One major challenge in future sustainable photochemistry is to replace precious and rare transition metals with earth-abundant, cheap, and recyclable materials, such as coordination complexes of first row transition metals like Cu, Cr, or Mn, in applications like energy conversion or electroluminescence. Recently, the fundamental limitations of using iron, which is attractive due to its natural abundance, have been overcome. This review article summarizes the current understanding of the structure-property relationships of Fe(II) and Fe(III) complexes with nanosecond range excited state lifetimes, while focusing on the potential insights provided by the less explored ultrafast vibrational spectroscopy to differentiate ligand- vs. metal-centered states.
Article
Chemistry, Multidisciplinary
Alexandre Walther, Irene Regeni, Julian J. Holstein, Guido H. Clever
Summary: Azulene is introduced as the backbone for a new family of Pd(II)-based self-assemblies, and these self-assemblies can be modulated by changing the organic ligands equipped with different donor groups. The addition of organic disulfonate guests to the smallest cage leads to a rapid transformation to a distorted-tetrahedral species, while cages formed from ligands with isoquinoline donors either encapsulate the guests or show no interaction. The tetrahedral species can be reverted back to its original topology by capturing the guest using another, stronger binding cage.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Inorganic & Nuclear
Yunling Pan, Miaomiao Zhou, Rui Wang, Dan Song, Shek-Man Yiu, Jianhui Xie, Kai-Chung Lau, Tai-Chu Lau, Yingying Liu
Summary: In this study, a new type of seven-coordinate ruthenium-iodosylbenzene complex was reported, which exhibited high reactivity towards various organic substrates through undergoing O-atom transfer and C-H bond activation reactions. The X-ray crystal structure of this complex revealed a distorted pentagonal bipyramidal geometry. This work provides insights for the development of new highly reactive oxidizing agents based on seven-coordinate geometry.
INORGANIC CHEMISTRY
(2023)
Article
Multidisciplinary Sciences
Emilia Dzien, Dorota Dudek, Danuta Witkowska, Magdalena Rowinska-Zyrek
Summary: The membrane environment has a significant impact on the structure and coordination mode of biologically relevant metal ions, including Cu(II) coordination to amylin analogues. The presence of the amylin C-terminus reduces its affinity for copper(II), while in membrane-mimicking solution, the Cu(II) affinities of amylin analogues are lower than in water.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Inorganic & Nuclear
Connor P. McLoughlin, James C. Fettinger, Philip P. Power
Summary: Six new transition-metal aryloxides were synthesized and characterized to compare the steric and dispersive characteristics of their substituents. The results show that the -C6H2-2,4,6-Cy-3 substituent has higher dispersive energy donor properties and influences the thermal stability. Complexes 1 and 2 exhibit high thermal stability and short-contact H···H interactions, while complexes 5 and 6 have a lower association number due to the lower dispersion energy donor properties of the -OC6H3-2,6-Pr-i (2) ligand.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Robert Dioszegi, Dora Bonczidai-Kelemen, Attila Cs Benyei, Nora May, Istvan Fabian, Norbert Lihi
Summary: Copper(II) complexes of pyridine-based ligands functionalized with alanine and tyrosine moieties were synthesized and characterized. The tyrosine-containing complex exhibited higher copper(II) binding affinity and activity than the alanine-containing complex, possibly due to the presence of the aromatic moiety. The results provide a basis for designing highly efficient copper(II) mimics for medical and practical applications.
INORGANIC CHEMISTRY
(2022)
Review
Chemistry, Inorganic & Nuclear
Isabel Castro, M. Luisa Calatayud, Marta Orts-Arroyo, Nadia Marino, Giovanni De Munno, Francesc Lloret, Rafael Ruiz-Garcia, Miguel Julve
Summary: This review provides an overview of inverse coordination chemistry and magnetochemistry of copper(II) systems with oxalato and polypyrazole ligands. The synthesis, structure, reactivity, and magnetic properties of oxalato-centered copper(II)-polypyrazole inverse polynuclear complexes (IPCs) and multidimensional inverse coordination polymers (ICPs) are discussed. The study of these low-dimensional IPCs and ICPs reveals new magneto-structural correlations, ranging from di- to hexanuclear species and chain-like systems with ferro- or antiferromagnetic interactions, leading to high-dimensional sheet-like systems with chemoswitching magnetic behavior for biogenic amine sensing. Future research trends will focus on the design and synthesis of mixed oxalato-centered ICPs with polytriazoles as additional bridging ligands, referred to as inverse metal-organic frameworks (IMOFs), for magnetic sensing of volatile organic compounds (VOCs) of biological, environmental, or industrial interest. (C) 2022 Published by Elsevier B.V.
COORDINATION CHEMISTRY REVIEWS
(2022)
Article
Chemistry, Inorganic & Nuclear
Soumen Saha, Sha Tamanna Sahil, Md Motiur R. Mazumder, Alexander M. Stephens, Bryan Cronin, Evert C. Duin, Jonah W. Jurss, Byron H. Farnum
Summary: Two NNN pincer complexes of Cu(II) and Ni(II) with BPIMe- ligands were synthesized and characterized structurally, spectroscopically, and electrochemically. The complexes displayed catalytic activity for the reduction of CO2, with the Cu(II) complex showing higher activity than the Ni(II) complex. However, both complexes decomposed into copper and nickel metal on the electrode surface during extended reductive electrolysis, indicating the role of ligand reduction in electrocatalysis and decomposition processes.
DALTON TRANSACTIONS
(2021)
Article
Multidisciplinary Sciences
Chong Deng, Jiefeng Liang, Rong Sun, Yi Wang, Peng-Xiang Fu, Bing-Wu Wang, Song Gao, Wenliang Huang
Summary: Understanding and exploiting the redox properties of uranium is of great importance due to its wide range of oxidation states and potential for small molecule activation. However, stabilizing low and high-valent uranium ions in a preserved ligand environment remains challenging. In this study, a series of uranium(II-VI) complexes supported by a tripodal tris(amido)arene ligand were synthesized and characterized.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Inorganic & Nuclear
P. R. Nimax, K. Suenkel
Summary: Recrystallization of reaction products from different starting materials yielded coordination polymers with different structures, showcasing the diverse roles of ligands in the bonding network; The polymer structures are maintained by a combination of Ba-N bonds, hydrogen bonds, nitrile functions, and pi stacking interactions.
Article
Chemistry, Inorganic & Nuclear
Zhi Zhong Ang, Shoba Laxmi, Felix Leon, Josephine E. M. Kooij, Felipe Garcia, Jason England
Summary: By using Me3OBF4, the methylation of a series of tris[(1-aryl-1,2,3-triazol-4-yl)methyl]amines under mechanochemical conditions shows higher chemoselectivity, providing a reliable way to access tricationic tris[4-(1,2,3-triazolium)methyl]amines in good yields. This change in regioselectivity is attributed to the difference in dielectric conditions between solution and solid state.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Benny Febriansyah, Yulia Lekina, Jagjit Kaur, Thomas J. N. Hooper, Padinhare Cholakkal Harikesh, Teddy Salim, Ming Hui Lim, Teck Ming Koh, Sudip Chakraborty, Ze Xiang Shen, Nripan Mathews, Jason England
Summary: Significant progress has been made in the development of materials and devices based on low-dimensional hybrid group 14 metal halide perovskites. This study focused on the impact of templating cations on the structure of n = 1 2D tin iodide perovskites, and demonstrated their potential as light absorbers for photovoltaic cells. By tuning organic dications, researchers induced the formation of unique structures with very short separations between inorganic layers, resulting in high photon-to-current and power conversion efficiencies for lead-free solar cells.
Article
Chemistry, Multidisciplinary
Sophie Morse, Aishwarya Mishra, Tiffany G. Chan, Rafael T. M. de Rosales, James J. Choi
Summary: The study investigates a noninvasive method of using ultrasound pulses to deliver liposomes across the blood-brain barrier for efficient drug delivery to the brain.
JOURNAL OF CONTROLLED RELEASE
(2022)
Article
Chemistry, Multidisciplinary
Maria Poley, Patricia Mora-Raimundo, Yael Shammai, Maya Kaduri, Lilach Koren, Omer Adir, Jeny Shklover, Janna Shainsky-Roitman, Srinivas Ramishetti, Francis Man, Rafael T. M. de Rosales, Assaf Zinger, Dan Peer, Irit Ben-Aharon, Avi Schroeder
Summary: Physiological changes in the female menstrual cycle impact the biodistribution of nanoparticles in the reproductive system, which has significant implications for treatment.
Article
Biochemical Research Methods
Azalea A. Khan, Francis Man, Farid N. Faruqu, Jana Kim, Fahad Al-Salemee, Amaia Carrascal-Minino, Alessia Volpe, Revadee Liam-Or, Paul Simpson, Gilbert O. Fruhwirth, Khuloud T. Al-Jamal, Rafael T. M. de Rosales
Summary: This study explored the use of [Zr-89]Zr(oxinate)(4) for labeling sEVs and demonstrated the possibility of tracking labeled sEVs in vivo using PET imaging. Differential biodistribution of intentionally heat-damaged sEVs compared to intact sEVs was also observed. Therefore, this method can be reliably used to explore the potential of sEVs as drug delivery systems.
BIOCONJUGATE CHEMISTRY
(2022)
Review
Chemistry, Multidisciplinary
Peter J. Gawne, Francis Man, Philip J. Blower, Rafael T. M. de Rosales
Summary: The arrival of cell-based therapies has revolutionized medicine. Radionuclide imaging, such as SPECT or PET, is a highly sensitive and quantitative imaging technique that has advantages for cell tracking. Direct cell radiolabeling, using a variety of chemical approaches, is a simple and reliable method for labeling cells without genetic modification.
Article
Nanoscience & Nanotechnology
Sara Lacerda, Wuyuan Zhang, Rafael T. M. de Rosales, Isidro Da Silva, Julien Sobilo, Stephanie Lerondel, Eva Toth, Kristina Djanashvili
Summary: This study successfully radiolabeled nanozeolite Linde type L (LTL) with a positron emission tomography (PET)-tracer zirconium-89 (Zr-89), demonstrating its beneficial biological behavior in vivo. The findings show good stability and integrity of the proposed multimodal probe, paving the way for further theranostic studies utilizing a variety of metal-based radioisotopes.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Radiology, Nuclear Medicine & Medical Imaging
Peter J. Gawne, Sara M. A. Pinto, Karin M. Nielsen, George P. Keeling, Mariette M. Pereira, Rafael T. M. de Rosales
Summary: Manganese porphyrins have a wide range of therapeutic and imaging applications, and can be used as radioprotectants and MRI contrast agents. The use of microwave heating allows for fast and efficient synthesis and labeling of [Mn-52]Mn-porphyrins, which show promising labeling efficiency and cellular stability. This technique has potential for in vivo imaging and quantification of Mn-porphyrin therapeutics.
NUCLEAR MEDICINE AND BIOLOGY
(2022)
Article
Engineering, Chemical
Juan Pellico, Ananda Jadhav, Laurence Vass, Agathe Bricout, Mostafa Barigou, Paul K. Marsden, Rafael T. M. de Rosales
Summary: This study presents a straightforward method for radiolabelling calcium alginate beads with gallium-68 for a wide range of positron emission particle tracking (PEPT) applications. The results show a high affinity between alginate and gallium-68, providing radiolabelled particles with excellent radiochemical properties and tracking performance.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Chemistry, Physical
Sarah K. Y. Ho, Chigozie Ezeorah, Suviti Chari, Ali Salehi-Reyhani, George J. P. Britovsek
Summary: The light-driven insertion reaction of oxygen into metal carbon bonds of BPI (1,3-bis(2-pyridylimino)isoindole) complexes [Pt(BPI)Me] and [Pd(BPI)Me] was studied using LED-NMR in CDCl3. The initial reaction formed peroxo complexes [Pt(BPI)OOMe] and [Pd(BPI)OOMe], which further reacted over time. Spectra were recorded at 1-minute intervals, allowing for tracking of the methyl substituent, which eventually produced formaldehyde and methanol in similar proportions. The presence of oxygen and light in the solvent CDCl3 led to side reactions, resulting in the formation of phosgene and DCl, as well as chloro methylformate and dimethyl carbonate.
Article
Multidisciplinary Sciences
George P. Keeling, Friedrich Baark, Orestis L. Katsamenis, Jing Xue, Philip J. Blower, Sergio Bertazzo, Rafael T. M. de Rosales
Summary: In this study, we compared the PET imaging of the BP tracer [Ga-68]Ga-THP-Pam and [F-18]NaF in a rat model of EC. The results showed that [Ga-68]Ga-THP-Pam was able to detect EC more sensitively.
SCIENTIFIC REPORTS
(2023)
Article
Polymer Science
Richard von Goetze, Ahmad Aljaber, Koon-Yang Lee, Gavin Hill, Christopher Wallis, George J. P. Britovsek
Summary: A series of end-functionalised polyethylene materials were synthesized via catalysed chain growth reaction. Different functional groups were introduced with varying effects. Blending polyethylene with polymers resulted in potential degradable blends.
Article
Chemistry, Physical
Quintin Lo, Dominic Pye, Sami Gesslbauer, Ying Sim, Felipe Garcia, Andrew J. P. White, George J. P. Britovsek
Summary: Several PNP-type diphosphine ligands with different N-bridging modes have been synthesized and characterized. These ligands exhibit good activities and selectivities for the tri- and tetramerization of ethylene, comparable to standard ligands. Computational studies also suggest that the binding of ethylene is favorable in these complexes, and the oligomerization mechanism involves both single and double ethylene insertions.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Physical
Mengjun Gong, Yanjun Guo, Daniel Malko, Javier Rubio-Garcia, Jack M. S. Dawson, George J. P. Britovsek, Anthony Kucernak
Summary: Under mild conditions, aldehydes are efficiently converted to epoxides using a heterogeneous Fe-N/C catalyst, which forms the corresponding organic peroxy acid and acylperoxy radicals. Real-time monitoring of oxygen consumption and catalyst potential reveals the formation of peroxy acid and subsequent catalytic epoxidation. The involvement of aldehyde and Fe-N/C catalyst is shown to be the rate determining step for the reaction, and the induction time can be increased by adding a radical scavenger.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Yulia Lekina, Sai S. H. Dintakurti, Benny Febriansyah, D. Bradley, Jiaxu Yan, Xiangyan Shi, Jason England, Tim White, John Hanna, Ze Xiang Shen
Summary: The study investigates the structural complexity and phase transition behavior of two-dimensional hybrid perovskite (PEA)(2)(MA)[Pb2I7], revealing an ill-defined phase transition occurring over the 150-200 K range. Raman scattering and H-1 MAS NMR data indicate changes in rotational modes and motional dynamics of the MA(+) organic sublattice during the phase transition, affecting the optical properties of the material.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)