Article
Chemistry, Inorganic & Nuclear
Lorenzo Arnal, Daniel Escudero, Sara Fuertes, Antonio Martin, Violeta Sicilia
Summary: This article describes the reaction mechanism of complexes [{Pt(C<^>C*)(mu-pz)}2] with methyl iodide and benzyl bromide, as well as the structure and spectroscopic properties of the products.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Fengkai He, Christophe Gourlaouen, Huan Pang, Pierre Braunstein
Summary: This study reports the synthesis of nickel and palladium N-heterocyclic carbene complexes through metal-promoted double geminal activation of C(sp(3))-H bonds of the N-CH2-N moiety in an imidazole-type heterocycle under mild conditions. The reaction mechanisms and key differences in the Pd and Ni chemistries were elucidated through crystal structure determination, isolation of reaction intermediates, and DFT calculations.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Yang Liu, Qing-qing Pan, Feng-wei Gao, Ying-chen Duan, Shui-xing Wu, Yu-he Kan, Zhong-min Su
Summary: By using DFT and TD-DFT methods, the relationship between structure and property of a series of homoleptic monocyclic and [2]catenanes gold(i) thiolates was analyzed. It was found that the [2]catenanes are more planar than the monocyclic molecules due to increased Au-S-Au bond angles in Au11 and Au12. The smaller Au-MIDLINE HORIZONTAL ELLIPSISAu contacts enhance the geometrical stability of the structures. The HOMO levels of the [2]catenanes are higher than those of the monocyclic molecules, and their absorption spectra exhibit a redshift consistent with the higher HOMO energy levels.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Antony P. Y. Chan, Martin Jakoobi, Chenxu Wang, Robert T. O'Neill, Gulsevim S. S. Aydin, Nathan Halcovitch, Roman Boulatov, Alexey G. Sergeev
Summary: This study reports highly selective ortho-C-H activation in alkylarenes by simple iridium complexes. The capacity of the alkyl substituent to override the typical preference of metal-mediated C-H activation for the least hindered aromatic C-H bonds results from transient insertion of iridium into the benzylic C-H bond. The described chemistry represents a conceptually new alternative to existing approaches for aromatic C-H bond activation.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Antony P. Y. Chan, Martin Jakoobi, Chenxu Wang, Robert T. O'Neill, Gulsevim S. S. Aydin, Nathan Halcovitch, Roman Boulatov, Alexey G. Sergeev
Summary: Highly selective ortho-C-H activation in alkylarenes can be achieved by simple iridium complexes, which override the typical preference for activation of the least hindered aromatic C-H bonds. This new approach enables fast iridium insertion into the ortho-C-H bond and regeneration of the benzylic C-H bond, offering a conceptually new alternative to existing methods for aromatic C-H bond activation.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Eric S. Yang, Emma Combey, Jose M. Goicoechea
Summary: This article reports a series of group 9 pyridine-diimine complexes M((PDI)-P-Dipp)X and [M((PDI)-P-Dipp)L](+) (M = Co, Rh; (PDI)-P-Dipp = 1,1'-(pyridine-2,6-diyl)bis(N-(2,6-diisopropylphenyl)ethan-1-imine); X = CP-, CCH-; L = CO, tBuNC) with strong-field ligands, including the cyaphide ion (C=P). A comparative study of the group 9 PDI cyaphide complexes Co((PDI)-P-Dipp)(CP) and Rh((PDI)-P-Dipp)(CP), as well as the N-heterocyclic carbene (NHC) gold(I) cyaphide complex Au(IDipp)(CP) (IDipp = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene), reveals the s donor and p acceptor properties of the kC-cyaphido ligand, and suggests a position for this ion in the spectrochemical series.
Article
Chemistry, Organic
Linhua Wang, Xuesong Zheng, Qinze Zheng, Zhenlong Li, Jian Wu, Ge Gao
Summary: A Cu-catalyzed regioselective C5-H arylation of imidazo[1,5-a]pyridines with aryl iodides was achieved with the assistance of an ethylthio group at the C3 position. This directing group could be easily removed to produce a range of 5-(hetero)arylimidazo[1,5-a]pyridine derivatives. The reaction tolerates various functionalities and is compatible with sterically hindered substrates.
Article
Chemistry, Organic
Yougourthen Boumekla, Fengjie Xia, Lucas Vidal, Cedric Totee, Christophe Raynaud, Armelle Ouali
Summary: A method to reduce aldimines via hydrosilylation using a catalytic system of calcium triflimide and potassium hexafluorophosphate is reported, achieving high yields in mild conditions. Additionally, a bioactive molecule with antifungal properties was successfully synthesized on a large scale in environmentally friendly solvent. The mechanism involves electrophilic activation of the silane by the calcium catalyst, as confirmed by experimental and DFT calculations.
ORGANIC & BIOMOLECULAR CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Saravanakumar Elangovan, Elisabeth Irran, Hendrik F. T. Klare, Martin Oestreich
Summary: The synthesis and characterization of novel cationic cobalt-(III) thiolate complexes and their ability to promote cooperative, heterolytic Sn-H bond activation have been investigated. It was found that the least congested complex efficiently catalyzes the dehydrogenative homocoupling of nBu3SnH at room temperature.
Article
Chemistry, Inorganic & Nuclear
Ming-Feng Xiong, Gao-Feng Liu, Bao-Hui Ye
Summary: A solvent-induced reaction from dioxygenation to C-S coupling in bis(2-phenylquinoline) Ir(III) thiolate complexes was developed, resulting in the formation of Ir(III) sulfinato and Ir(III) tetradentate complexes. This provides a new protocol for C-S bond formation in situ.
INORGANIC CHEMISTRY
(2023)
Review
Chemistry, Multidisciplinary
Xiaotian Qi, Yu Lan
Summary: Metal carbenes play a crucial role in modern organic synthesis, and computational studies of their transformation reactions with different nucleophiles can provide valuable mechanistic insights for the design of new reactions. Three generalized reaction models for carbene transformation with nucleophiles are proposed based on our computational results: intramolecular migratory insertion of metal carbene, intermolecular nucleophilic addition towards metal carbene, and outer-sphere nucleophilic addition to metal-ligated free carbene.
ACCOUNTS OF CHEMICAL RESEARCH
(2021)
Article
Chemistry, Inorganic & Nuclear
Zahra Farasat, S. Masoud Nabavizadeh, Fatemeh Niroomand Hosseini, S. Jafar Hoseini, Mahdi M. Abu-Omar
Summary: This study investigated the reactivity of cyclometalated platinum(II) complexes with different acids, revealing that the selectivity of the reaction can be influenced by the nature of the ancillary ligand, potentially affecting the cleavage of Pt-C bond. Computational discussions and experimental results suggested that a one-step electrophilic attack at the Pt-C bond is the most likely mechanism for these complexes, with the potential to change the selectivity in Pt-C bond cleavage.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Inorganic & Nuclear
Allan J. Canty, Alireza Ariafard, Helena C. Matinakova
Summary: The study uses Density Functional Theory to examine the synthesis of benzofurans through the reaction of a palladium complex with hypervalent iodine(III) reagents. It reveals the key role of oxidative alkenylation, initial adduct formation, and 'chain-walking' at Pd-II centers in the annulation process. Computational analysis helps to reinterpret NMR data and determine barriers in the reaction pathway for key intermediates.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Physical
Matthew Dutra, Jose A. Amaya, Shannon McElhenney, Olivia M. Manley, Thomas M. Makris, Vitaly Rassolov, Sophya Garashchuk
Summary: This study investigates the hydrogen atom transfer (HAT) reaction by Compound I in the high-valent ferryl cytochrome P450 (CYP) intermediate. The research contributes to the understanding of biomimetic catalysts for controlled C-H bond activation, which is a challenge in synthetic chemistry.
JOURNAL OF PHYSICAL CHEMISTRY B
(2022)
Article
Chemistry, Inorganic & Nuclear
Ashok Kumar, Rohit Gupta, Ganesan Mani
Summary: A one-pot reaction was conducted between ethylenediamine, paraformaldehyde, and Ph2PH or tBu2PH, yielding a new diphosphine compound, 1,3-bis((diphenylphosphanyl)methyl)imidazolidine L1 or 1,3-bis((di-tert-butylphosphanyl)methyl)imidazolidine L2, respectively, with high yields. Metalation of L1 and L2 with [NiCl2(DME)] in the presence of KPF6 resulted in the formation of pincer carbene nickel chloride complexes, [(PhPCP)NiCl]PF6 and [(tBuPCP)NiCl]-PF6, through simultaneous double C-H bond activations. The thiolate complexes, [(PhPCP)Ni(SPh)2], [(PhPCP)NiSPh]PF6, and [(tBuPCP)NiSPh]PF6, produced by the reaction of 1 and 2 with PhSNa acted as efficient catalysts for the hydrosilylation of aldehydes, ketones, and nitroarenes.
Article
Chemistry, Multidisciplinary
Felix Langenohl, Jonas Roesler, Sebastian Zuehlke, Jan-Lukas Kirchhoff, Carsten Strohmann
Summary: A silicon-stereogenic aminosilanol with excellent diastereomeric ratio and determined absolute configuration was isolated. It was found to be configurative and condensation stable in solution, and showed stereoselective transformations in follow-up reactions, leading to the isolation of a silicon-stereogenic zinc complex and siloxane compounds. It was also discovered that there was an exchange of oxygen atoms between the silanol and water in solution, while the configuration at the silicon center remained unchanged. This study provides new analytical possibilities for studying the stereochemical courses of reactions using chiral silanols mechanistically.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Physical
Monia Hamdouni, Chakib Hrizi, Houssem Eddine Ahmed, Michael Knorr, Anna Krupp, Carsten Strohmann, Slaheddine Chaabouni
Summary: An acetone solution of Bi(NO3)(3) was treated with quinoxaline (Qx) and hydroiodic acid, resulting in the formation of a crystallographically characterized 1D-polymeric iodobismutate salt [(Qx-H+)BiI4] n (1). The main product, 5,6,7,8-tetranitro-1,2,3,4tetrahydroquinoxaline-2,3-diol (2), was accidentally formed under mild reaction conditions. The molecular structure of compound 2 was determined using X-ray diffraction, and its supramolecular network and properties were analyzed.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Chemistry, Multidisciplinary
Moritz Achternbosch, Lukas Zibula, Annika Schmidt, Waldemar Krieger, Norbert Kockmann, Carsten Strohmann
Summary: Organolithium compounds have been successfully used in flow chemistry, mostly in halogen-lithium exchanges. However, their use in substitution reactions has been limited. The use of flow microreactors allows for better control over the highly reactive organolithium compounds, leading to new synthetic possibilities.
JOURNAL OF FLOW CHEMISTRY
(2023)
Article
Chemistry, Organic
Isabelle Jourdain, Michael Knorr, Tom Charenton, Carsten Strohmann, Jan-Lukas Kirchhoff, Mohamed Othman
Summary: The reaction of [Co-2(CO)(8)] with an internal alkyne N-(2-butynyl)phthalimide in heptane solution results in the formation of [Co-2(CO)(6)(mu-phthalimidoCH(2)C equivalent to CMe)]. Compound 2 has been characterized using various techniques and its tetrahedrane-type cluster framework has been determined by X-ray diffraction study.
Article
Chemistry, Multidisciplinary
Felix Otte, Johannes Kleinheider, Bastian Grabe, Wolf Hiller, Franziska Busse, Ruimin Wang, Nora M. Kreienborg, Christian Merten, Ulli Englert, Carsten Strohmann
Summary: This study investigates strong and weak halogen bonds involving the same acceptor in solution and in the solid state. NMR titrations reliably identify strong intermolecular interactions, with experimental binding energies of approximately 7 kJ/mol. Raman spectroscopy is used to assess the interaction energy in halogen-bonded adducts in condensed phase, and high-resolution X-ray diffraction provides an experimental picture of the electronic density for the halogen bonds.
Article
Crystallography
Annika Schmidt, Isabelle Jourdain, Michael Knorr, Carsten Strohmann
Summary: This article reports a new square-planar platinum(II) dithioether complex. The complex crystallizes in the monoclinic space group P2(1)/c. Hirshfeld analyses reveal that the C-H···π interaction is the most significant packing factor.
ACTA CRYSTALLOGRAPHICA SECTION E-CRYSTALLOGRAPHIC COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Wafa Arar, Ridha Ben Ali, Michele Veronique El May, Abderrahim Khatyr, Isabelle Jourdain, Michael Knorr, Lukas Brieger, Rebecca Scheel, Carsten Strohmann, Asma Chaker, Azaiez Ben Akacha
Summary: The aim of this study was to synthesize and characterize a new series of copper(I) complexes with thiocarbamate ligands and evaluate their biological activity. The complexes exhibited distorted tetrahedral geometry and displayed intramolecular N-H···Hal bonding. The complexes showed weak luminescence in solution, with high-energy bands centered on the thioamidate and triarylphosphine ligands observed in the solid state. The complexes did not exhibit significant antibacterial capacity but showed antioxidant activity, with maximum activity observed for certain complexes.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Biochemistry & Molecular Biology
Amani Toumi, Faiza I. A. Abdella, Sarra Boudriga, Tahani Y. A. Alanazi, Asma K. Alshamari, Ahlam Abdulrahman Alrashdi, Amal Dbeibia, Khaled Hamden, Ismail Daoud, Michael Knorr, Jan-Lukas Kirchhoff, Carsten Strohmann
Summary: A series of novel spirooxindoles have been synthesized via a three-component reaction and evaluated for their antimicrobial, anti-inflammatory, and analgesic activities. Some of the compounds exhibited remarkable growth inhibition against various microorganisms and demonstrated better antifungal and enzyme inhibitory activity compared to reference drugs.
Article
Biochemistry & Molecular Biology
Yaping Cheng, Geoffrey Gontard, Abderrahim Khatyr, Michael Knorr, Hani Amouri
Summary: Luminescent N-heterocyclic carbene chloride copper (I) complexes incorporating pyrene chromophore (1-Pyrenyl-NHC-R)-Cu-Cl with different substituents (methyl or naphthyl) were synthesized and characterized. X-ray diffraction confirmed the formation of the target compounds. These compounds exhibited blue emission in both solution and solid-state at room temperature, with comparable or higher quantum yields than the parent pyrene molecule. Notably, the quantum yield was increased by almost two-fold by replacing the methyl group with a naphthyl group. These compounds show potential for applications in optical displays.
Article
Chemistry, Inorganic & Nuclear
Paul Erik Schneider, Jonathan Wattenberg, Jan Frederick Wappelhorst, Michael Knorr, Carsten Strohmann
Summary: A new synthesis route for aromatic organosilicon-based thioether ligands was established and used to form new complexes with palladium(II) chloride. The solid-state structures favored one pair of diastereomers and could be controlled by aromatic substituents. The conformation at the sulfur atoms in solution was temperature-dependent, with a coalescence temperature at around 24 degrees C.
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
(2023)
Review
Chemistry, Inorganic & Nuclear
Pramod Kumar, Sunil Tomar, Krishan Kumar, Sushil Kumar
Summary: Chemical nucleases have potential applications in chemistry, biotechnology, and medicine. The development of self-activating chemical nucleases as therapeutic agents for DNA damage has received increasing attention in the past decade. This review article discusses the mechanistic investigation and application prospects of self-activating DNA nucleases, focusing on copper, zinc, and iron complexes.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Inorganic & Nuclear
Dilip Pandey, Gopal Singh, Shivendu Mishra, Lydie Viau, Michael Knorr, Abhinav Raghuvanshi
Summary: Cu(I)-based coordination polymers (CPs) are efficient emissive materials that provide an ecofriendly and cost-effective platform for the development of functional materials and sensors. Organic ligands play a crucial role in controlling the emissive properties of CPs. In this study, dithiane- and dithiolane-substituted triphenylamine ligands were synthesized and showed emissive properties in both solid state and solution. Coordination polymers were synthesized with Cu(I)X salts, and their emission behavior suggested ligand-centered transitions. Mechanical grinding caused emission shifts and increased intensity, potentially due to changes in the spatial arrangement of the phenyl groups and aggregation-induced quenching.
DALTON TRANSACTIONS
(2023)
Review
Chemistry, Inorganic & Nuclear
Nidhi Goswami, Sudhanshu Naithani, Jimmy Mangalam, Tapas Goswami, Ritesh Dubey, Pramod Kumar, Pankaj Kumar, Sushil Kumar
Summary: Group 10 metals, such as Ni, Pd, and Pt, have wide applications in various aspects of human life and industries. However, mishandling or overuse of these metals can lead to serious contamination of the environment, especially in soil and water. Detecting these metal ions in biological and environmental samples is crucial for human health. Optical sensing, particularly using fluorescent or colorimetric organic sensors, has gained attention for selective detection of these metal ions. This review summarizes the recent progress in the design and fabrication of such sensors and highlights the challenges and prospects in this field.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Inorganic & Nuclear
Dilip Pandey, Gopal Singh, Shivendu Mishra, Lydie Viau, Michael Knorr, Abhinav Raghuvanshi
Summary: Cu(I)-based coordination polymers (CPs) are efficient emissive materials. Organic ligands and Cu(I)X salts were used to synthesize four new CPs. The emission properties of the CPs were influenced by mechanical grinding, causing shifts in emission wavelength and increased emission intensity, which may be related to changes in spatial arrangement and aggregation-induced quenching.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Multidisciplinary
Moumin Aden, Abdirahman Elmi, Jerome Husson, Samaleh Idriss, Claudine Filiatre, Michael Knorr
Summary: The development of environmentally friendly, reusable, and highly performant adsorbent materials for the removal of heavy metal ions is a big challenge in the field of wastewater treatment. In this study, ecofriendly composite materials based on alginates extracted from Sargassum sp and Turbunaria and supported on different silica particles were prepared and used as adsorbents for Ni(II) ions removal from aqueous solutions. These composites efficiently extract Ni(II) ions, surpassing the adsorption capacities of other adsorbents reported so far in the literature.
CHEMISTRY AFRICA-A JOURNAL OF THE TUNISIAN CHEMICAL SOCIETY
(2023)