Article
Chemistry, Multidisciplinary
Runxia Nan, Yiwen Li, Zhouli Zhu, Fan Qi, Xu-Qiong Xiao
Summary: This study focused on the synthesis and transformation of functional groups in metallacarboranes, and investigated their impact on the structure and properties of the metallacarborane framework.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Sebastian Planer, Jenni Frosch, Marvin Koneczny, Damian Trzybinski, Krzysztof Wozniak, Karol Grela, Matthias Tamm
Summary: This study explores the use of lithium complexes with weakly coordinating borate moieties for the preparation of silver(I) or copper(I) WCA-NHC complexes. Reactions in different solvents and with different metals are investigated, revealing various transformations during the process.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Wioletta Kosnik, Dawid Lichosyt, Marcin Sniezek, Angelika Janaszkiewicz, Krzysztof Wozniak, Maura Malinska, Bartosz Trzaskowski, Anna Kajetanowicz, Karol Grela
Summary: The formation of sterically hindered C-C double bonds through catalytic olefin metathesis is a challenging task for Ru catalysts. To overcome this limitation, a new NHC ligand was designed, which reduced the susceptibility of small-size NHC catalysts to decomposition. The resulting isomeric complexes exhibited similar high thermodynamic stability but different application profiles in catalysis.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Qiuming Liang, Kasumi Hayashi, Longfei Li, Datong Song
Summary: The dioxygenation of mesoionic N-heterocyclic olefins (mNHOs) using molecular dioxygen has been reported. Depending on the presence of a vinyl proton and acidic C-H group, the mNHOs are oxidized into different products.
CHEMICAL COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Bastiaan Kooij, Zhaowen Dong, Paul Varava, Farzaneh Fadaei-Tirani, Rosario Scopelliti, Laura Piveteau, Kay Severin
Summary: This study reports the preparation and structural characterization of vanadium complexes with N-heterocyclic vinylidene ligands, enabled by utilizing diazoolefins as ligand precursors. Structural and theoretical analysis show that N-heterocyclic vinylidenes can act as strong 6e(-) donor ligands, forming strong metal-carbon interactions.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Applied
Angelina Mary, Nimisha Jain, Rahul Sakla, D. Amilan Jose, Bhagwan Sahai Yadav, Abbas Raja Naziruddin
Summary: This article presents the syntheses of ruthenium (II) complexes with an N-heterocyclic carbene (NHC)-based C and N donor set and an -NCS ligand, and evaluates their use as photosensitizers in dye-sensitized solar cells (DSSCs). Results show that the complexes without a phenyl spacer between the acid anchor and the tpy effectively absorb visible light and have higher photon conversion efficiency (PCE) in DSSCs.
APPLIED ORGANOMETALLIC CHEMISTRY
(2023)
Article
Biochemistry & Molecular Biology
Hilke Burmeister, Pascal Dietze, Lutz Preu, Julia E. Bandow, Ingo Ott
Summary: Ruthenium(II) NHC complexes exhibited stronger antibacterial effects compared to metal-free benzimidazolium cations, particularly against Gram-positive bacteria. The inhibition of bacterial thioredoxin reductase by selected complexes suggested a potential contributing factor to their antibacterial effects.
Article
Chemistry, Inorganic & Nuclear
Sofie M. P. Vanden Broeck, Nikolaos V. V. Tzouras, Marina Saab, Kristof Van Hecke, Busra Dereli, Ida Ritacco, Luigi Cavallo, Georgios C. C. Vougioukalakis, Pierre Braunstein, Steven P. P. Nolan, Andreas A. A. Danopoulos, Catherine S. J. Cazin
Summary: The 4-RN-1,3-Ar-2-imidazolium salt, R = iPr, tBu, Ar = Mes, Dipp, underwent metalation by Au-I at the C2-, C5-, and 4-RN positions, depending on the reactants and conditions used. A rare direct rearrangement of the Au-I aminide to an abnormal imidazol-5-ylidene Au-I complex was also observed, which may involve TfO- facilitated H+ transfer, according to a DFT study.
DALTON TRANSACTIONS
(2023)
Article
Infectious Diseases
Jessica Ceramella, Rubina Troiano, Domenico Iacopetta, Annaluisa Mariconda, Michele Pellegrino, Alessia Catalano, Carmela Saturnino, Stefano Aquaro, Maria Stefania Sinicropi, Pasquale Longo
Summary: Ruthenium N-heterocyclic carbene (Ru-NHC) complexes were designed, synthesized, and evaluated for their biological activities. The complexes displayed significant anticancer activity against triple-negative human breast cancer cell lines MDA-MB-231. They also showed potent antibacterial activity against Gram-positive bacteria Staphylococcus aureus and strong antioxidant ability.
Article
Biochemistry & Molecular Biology
Stefan Czarnocki, Louis Monsigny, Michal Sienkiewicz, Anna Kajetanowicz, Karol Grela
Summary: A modular and flexible strategy for synthesizing N-heterocyclic carbene (NHC) ligands bearing Bronsted base tags has been proposed and used to prepare two tagged NHC ligands with different acid residues. These tagged NHC ligands serve as an attractive starting point for the synthesis of olefin metathesis ruthenium catalysts with non-dissociating ligands. The impact of the Bronsted base tags on the activity of the obtained olefin metathesis catalysts has been investigated.
Article
Chemistry, Organic
Jayeeta Bhattacharjee, Dirk Bockfeld, Matthias Tamm
Summary: The reactions of N-heterocyclic carbene-phosphinidene adducts with dinuclear ruthenium and osmium complexes resulted in the formation of half-sandwich complexes with different geometries. The ruthenium complex showed high activity in the hydroboration of various substrates under mild reaction conditions. Preliminary mechanistic and kinetic studies suggested the formation of a monohydride complex as the catalytically active species.
JOURNAL OF ORGANIC CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Jin Zhang, Tao Li, Xiangyang Li, Anqi Lv, Xue Li, Zheng Wang, Ruihong Wang, Yangmin Ma, Ran Fang, Roman Szostak, Michal Szostak
Summary: This study reports on the catalytic properties of thiazol-2-ylidenes in transition metal catalysis. It demonstrates that thiazol-2-ylidenes, as carbene ligands, possess enhanced pi-electrophilicity and can be used in transition metal-catalysed electrophilic cyclization reactions. The study evaluates the steric and electronic properties of thiazol-2-ylidenes and provides insights into their structural characterization and coordination chemistry. This mode of catalysis has potential applications in late-stage drug functionalization, providing important building blocks for medicinal chemistry.
COMMUNICATIONS CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Bijoy Ghosh, Jorge Juan Cabrera-Trujillo, Israel Fernandez, Ashwini K. Phukan
Summary: Density functional theory calculations predict that functionalities with strong pi-electron donating potential can stabilize neutral five-membered boron(i) carbenoids. These carbenoids have the highest known singlet-triplet energy separation values and can activate various strong bonds. The combined activation strain model-energy decomposition analysis method can quantitatively explain the different reactivity trends exhibited by the proposed borylenes.
INORGANIC CHEMISTRY FRONTIERS
(2022)
Article
Chemistry, Multidisciplinary
Arne Merschel, Dennis Rottschaefer, Beate Neumann, Hans-Georg Stammler, Mark Ringenberg, Maurice Van Gastel, T. Ilgin Demirer, Diego M. M. Andrada, Rajendra S. S. Ghadwal
Summary: In this study, we have successfully synthesized and isolated two stable anions K[SIPrBp] (4 a-K) and K[IPrBp] (4 b-K). These anions, derived from classical N-heterocyclic carbenes (NHCs), exist as violet crystalline solids.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Carmela De Risi, Arianna Brandolese, Graziano Di Carmine, Daniele Ragno, Alessandro Massi, Olga Bortolini
Summary: Oxidative N-heterocyclic carbene (NHC) catalysis has the potential to achieve oxidative and oxygenative transformations, generating various NHC-bound intermediates and enabling non-umpolung processes through the activation of carbon atoms and heteroatoms. This review aims to discuss the recent developments in the field of oxidative NHC catalysis since 2014, with a focus on pivotal intermediates and their mechanistic involvement. More details can be found in the review article by C. De Risi and co-workers.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Ana Arauzo, Javier A. Cabeza, Israel Fernandez, Pablo Garcia-Alvarez, Ines Garcia-Rubio, Carlos J. Laglera-Gandara
Summary: The reactivity of PGeP germylene with late first-row transition metal dichlorides has been investigated, leading to the formation of various pincer chloridogermyl complexes. Different transition metals resulted in different paramagnetic or square planar complexes, indicating a variety of spin states and behaviors. Reactivity with NiCl2 and CuCl2 also produced different complexes, showcasing a versatile reactivity of the germylene compound.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Inorganic & Nuclear
Javier A. Cabeza, Pablo Garcia-Alvarez, Carlos J. Laglera-Gandara, Enrique Perez-Carreno
Summary: The interaction between the dipyrromethane-based chloridogermyl complexes and LiOMe or LiMe led to the synthesis of monosubstituted or dimethyl complexes. The regioselectivities of these reactions were rationalized with DFT calculations.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2021)
Review
Chemistry, Inorganic & Nuclear
Javier A. Cabeza, Pablo Garcia-alvarez
Summary: This article discusses the use of heavier tetrylenes as ligands in transition metal chemistry, focusing on reactions that have produced complexes with cyclometallated HTs. Eight HT ligands have been reported to undergo cyclometallation, with some catalytic applications also being surveyed.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Javier A. Cabeza, Jose M. Fernandez-Colinas, Joaquin Garcia-Alvarez, Pablo Garcia-Alvarez, Carlos J. Laglera-Gandara, Marina Ramos-Martin
Summary: A family of germyl rhodium complexes derived from the PGeP germylene have been synthesized and their reactivity and applications have been studied.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Review
Chemistry, Multidisciplinary
Javier A. Cabeza, Pablo Garcia-Alvarez
Summary: Two synthetic approaches have been utilized to synthesize transition metal complexes with tridentate PEP tetryl ligands. One approach involves the oxidative addition of an E-X bond (X=H, C or halogen) to a low-valent transition metal complex using tetrelanes as the metal-free precursor, while the other approach involves the insertion of an E atom into an M-X bond (X=Cl) of the metal precursor or derivatization of the E atom after coordination to the metal using tetrylenes. This review discusses the different types of PEP tetryl ligand frameworks found in transition metal complexes for each synthetic approach.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Inorganic & Nuclear
Carmen Lorenzo-Aparicio, Sonia Moreno-Blazquez, Montserrat Olivan, Miguel A. Esteruelas, Mar Gomez Gallego, Pablo Garcia-Alvarez, Javier A. Cabeza, Miguel A. Sierra
Summary: The synthesis of Pt pincer complexes derived from purine and purine nucleosides is reported. The complexes have different coordination points due to the structure of the purine skeleton and substituents on the phenyl ring. The complexes show regioselectivity and have potential applications as interstrand cross-linking models.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Javier Cabeza, Felipe Garcia, Pablo Garcia-Alvarez, Ruben Garcia-Soriano, Enrique Perez-Carreno
Summary: In this study, a series of compounds with heavier tetrylene (germylene or stannylene) and two phosphane fragments have been synthesized. These compounds show different coordination modes with metal atoms, resulting in the formation of various coordination products.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Javier A. Cabeza, Javier F. Reynes, Felipe Garcia, Pablo Garcia-Alvarez, Ruben Garcia-Soriano
Summary: Iconic Lappert's heavier tetrylenes were efficiently prepared using a completely solvent-free mechanochemical route, representing a fast, high-yielding, and scalable approach with a small environmental footprint. This method is a rare example of the use of mechanochemistry in the realm of main group chemistry.
Article
Chemistry, Inorganic & Nuclear
Javier A. Cabeza, Israel Fernandez, Pablo Garcia-alvarez, Ruben Garcia-Soriano, Carlos J. Laglera-Gandara, Ruben Toral
Summary: The compounds H(2)pyrmP(t)Bu(2) and (HpyrmP(i)Pr(2))(2)CMe2 were used to synthesize new P-donor-stabilized stannylenes, demonstrating their potential as precursors to transition metal complexes.
DALTON TRANSACTIONS
(2021)