1
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Podchorodecka P, Dziuk B, Junga R, Szostak R, Szostak M, Bisz E. IPr* Thia - wingtip-flexible, sterically hindered, modular, N,C/S,C-chelating thiazole-donor N-heterocyclic carbene ligands. Dalton Trans 2024. [PMID: 39230139 DOI: 10.1039/d4dt01468e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/05/2024]
Abstract
N-Heterocyclic carbenes (NHCs) represent a pivotal class of ligands in coordination chemistry owing to their unique electronic properties. In particular, hemilabile N-heterocyclic carbenes have garnered significant attention over the past decade due to their capacity to transiently coordinate to metals and open coordination sites. However, hemilabile NHC ligands have been predominantly limited to N, O and P donors, while NHC ligands bearing versatile S-donors have been severely underdeveloped. Herein, we report wingtip-flexible, sterically hindered NHC ligands that feature N,C/S,C-chelating thiazole donors in combination with the powerful IPr* (IPr* = (2,6-bis(diphenylmethyl)-4-methylphenyl)imidazol-2-ylidene) scaffold. These ligands are prepared using a highly modular SNAr arylation of thiazole derivatives. Full structural and electronic characterization is reported. The ligands feature a high barrier to rotation around the N-thiazole axis (10 kcal mol-1). The ligands are evaluated for their steric, electron-donating and π-accepting properties as well as coordination chemistry to Ag(I), Pd(II), Rh(I) and Se. Preliminary studies on Ag, Pd and Rh catalysis are presented. The efficiency of the approach is highlighted by preparing a library of unsymmetrical imidazolium precursors. The mono-IPr* wingtip provides a highly hindered yet sterically flexible environment adjusting to metal centers, while the N-thiazolyl wingtip displays a fluxional behavior that interchanges from the hard/soft N,C to soft/soft S,C coordination. Considering the importance of hemilabile N-heterocyclic carbene ligands in metal stabilization in inorganic and organometallic chemistry, we expect that this class of ligands will be of broad interest.
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Affiliation(s)
- Pamela Podchorodecka
- Department of Chemistry, Opole University, 48 Oleska Street, Opole 45-052, Poland.
| | - Błażej Dziuk
- Department of Chemistry, University of Science and Technology, Norwida 4/6, Wroclaw 50-373, Poland
| | - Robert Junga
- Department of Thermal Engineering and Industrial Facilities, Opole University of Technology, 5 Mikołajczyka Street, Opole 45-271, Poland
| | - Roman Szostak
- Department of Chemistry, Wroclaw University, F. Joliot-Curie 14, Wroclaw 50-383, Poland
| | - Michal Szostak
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, NJ 07102, USA.
| | - Elwira Bisz
- Department of Chemistry, Opole University, 48 Oleska Street, Opole 45-052, Poland.
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2
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Mukhopadhyay J, Bhagat S, Sahoo SC, Bharatam PV. L→S Coordination Complexes Containing Benzothiazol-2-ylidene Ligand: Quantum Chemical Analysis and Synthesis. Chempluschem 2024; 89:e202400150. [PMID: 38554142 DOI: 10.1002/cplu.202400150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2024] [Revised: 03/29/2024] [Accepted: 03/29/2024] [Indexed: 04/01/2024]
Abstract
(NHC)→E coordination interactions were known where NHC is an N-heterocyclic carbene, and E is a main group element (B, C, N, Si, P). Recently, it was suggested that compounds with (NHC)→S coordination chemistry are also possible. This work reports quantum chemical analysis and synthesis of (NHC)→S-R(+) complexes in which benzothiazol-2-ylidene acts as a ligand. A Density functional study established that (NHC)→S interaction can best be described as a coordination interaction. Synthetic efforts were made, initially, to generate divalent sulfur compounds containing benzothiazole substituents. N-alkylation of the heterocyclic ring in these sulfides using methyl triflate led to the generation of the desired products with (NHC)→S coordination chemistry, which involves the in situ generation of NHC ring ligands. The observed changes in the 13C NMR spectra, before and after methylation, confirmed the change in the electronic character of the C-S bond from a covalent character to a coordination character.
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Affiliation(s)
- Joy Mukhopadhyay
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S., Nagar, Punjab, 160062, India
| | - Srikant Bhagat
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S., Nagar, Punjab, 160062, India
| | - Subash C Sahoo
- Department of Chemistry, Panjab University, Sector 14, Chandigarh, 160014, India
| | - Prasad V Bharatam
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S. A. S., Nagar, Punjab, 160062, India
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3
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Kaplanai E, Tzouras NV, Tsoureas N, Bracho Pozsoni N, Bhandary S, Van Hecke K, Nolan SP, Vougioukalakis GC. Synthesis of N-heterocyclic carbene (NHC)-Au/Ag/Cu benzotriazolyl complexes and their catalytic activity in propargylamide cycloisomerization and carbonyl hydrosilylation reactions. Dalton Trans 2024; 53:11001-11008. [PMID: 38874579 DOI: 10.1039/d4dt01414f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2024]
Abstract
Carbene-metal-amide (CMA) complexes of gold, silver, and copper have been studied extensively for their photochemical/photocatalytic properties and as potential (pre-)catalysts in organic synthesis. Herein, the design, synthesis, and characterization of five bench-stable Au-, Ag-, and Cu-NHC complexes bearing the benzotriazolyl anion as an amide donor, are reported. All complexes are synthesized in a facile and straightforward manner, using mild conditions. The catalytic activity of the Ag and Cu complexes was studied in propargylamide cycloisomerization and carbonyl hydrosilylation reactions. Both CMA-catalyzed transformations proceed under mild conditions and are highly efficient for a range of propargylamides and carbonyl compounds, respectively, affording the desired corresponding products in good to excellent yields.
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Affiliation(s)
- Entzy Kaplanai
- Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, 15771, Athens, Greece.
| | - Nikolaos V Tzouras
- Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, 15771, Athens, Greece.
- Department of Chemistry and Centre of Sustainable Chemistry, Ghent University, Krijgslaan 281, S-3, 9000 Ghent, Belgium.
| | - Nikolaos Tsoureas
- Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, 15771, Athens, Greece.
| | - Nestor Bracho Pozsoni
- Department of Chemistry and Centre of Sustainable Chemistry, Ghent University, Krijgslaan 281, S-3, 9000 Ghent, Belgium.
| | - Subhrajyoti Bhandary
- Department of Chemistry and Centre of Sustainable Chemistry, Ghent University, Krijgslaan 281, S-3, 9000 Ghent, Belgium.
| | - Kristof Van Hecke
- Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, 15771, Athens, Greece.
| | - Steven P Nolan
- Department of Chemistry and Centre of Sustainable Chemistry, Ghent University, Krijgslaan 281, S-3, 9000 Ghent, Belgium.
| | - Georgios C Vougioukalakis
- Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, 15771, Athens, Greece.
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4
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Hazemann J, Kimmerlin T, Lange R, Sweeney AM, Bourquin G, Ritz D, Czodrowski P. Identification of SARS-CoV-2 Mpro inhibitors through deep reinforcement learning for de novo drug design and computational chemistry approaches. RSC Med Chem 2024; 15:2146-2159. [PMID: 38911172 PMCID: PMC11187573 DOI: 10.1039/d4md00106k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2024] [Accepted: 04/20/2024] [Indexed: 06/25/2024] Open
Abstract
Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has caused a global pandemic of coronavirus disease (COVID-19) since its emergence in December 2019. As of January 2024, there has been over 774 million reported cases and 7 million deaths worldwide. While vaccination efforts have been successful in reducing the severity of the disease and decreasing the transmission rate, the development of effective therapeutics against SARS-CoV-2 remains a critical need. The main protease (Mpro) of SARS-CoV-2 is an essential enzyme required for viral replication and has been identified as a promising target for drug development. In this study, we report the identification of novel Mpro inhibitors, using a combination of deep reinforcement learning for de novo drug design with 3D pharmacophore/shape-based alignment and privileged fragment match count scoring components followed by hit expansions and molecular docking approaches. Our experimentally validated results show that 3 novel series exhibit potent inhibitory activity against SARS-CoV-2 Mpro, with IC50 values ranging from 1.3 μM to 2.3 μM and a high degree of selectivity. These findings represent promising starting points for the development of new antiviral therapies against COVID-19.
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Affiliation(s)
- Julien Hazemann
- Physical Chemistry, Chemistry Department, Johannes Gutenberg University Duesbergweg 10-14 55128 Mainz Germany
- Drug Discovery Chemistry, Idorsia Pharmaceuticals Ltd. Hegenheimermattweg 91 4123 Allschwil Switzerland
| | - Thierry Kimmerlin
- Drug Discovery Chemistry, Idorsia Pharmaceuticals Ltd. Hegenheimermattweg 91 4123 Allschwil Switzerland
| | - Roland Lange
- Drug Discovery Chemistry, Idorsia Pharmaceuticals Ltd. Hegenheimermattweg 91 4123 Allschwil Switzerland
| | - Aengus Mac Sweeney
- Drug Discovery Chemistry, Idorsia Pharmaceuticals Ltd. Hegenheimermattweg 91 4123 Allschwil Switzerland
| | - Geoffroy Bourquin
- Drug Discovery Chemistry, Idorsia Pharmaceuticals Ltd. Hegenheimermattweg 91 4123 Allschwil Switzerland
| | - Daniel Ritz
- Drug Discovery Chemistry, Idorsia Pharmaceuticals Ltd. Hegenheimermattweg 91 4123 Allschwil Switzerland
| | - Paul Czodrowski
- Physical Chemistry, Chemistry Department, Johannes Gutenberg University Duesbergweg 10-14 55128 Mainz Germany
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5
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Guerra C, Rodríguez-Núñez YA, Ensuncho AE. Role of Triplet States in the Photolysis of Proteogenic Amino Acids. Chemphyschem 2024; 25:e202300655. [PMID: 38057134 DOI: 10.1002/cphc.202300655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2023] [Revised: 11/19/2023] [Indexed: 12/08/2023]
Abstract
This investigation delves into the UV photodissociation of pivotal amino acids (Alanine, Glycine, Leucine, Proline, and Serine) at 213 nm, providing insights into triplet-state deactivation pathways. Utilizing a comprehensive approach involving time-dependent density functional calculations (TD-DFT), multi-configurational methods, and ab-initio molecular dynamics (AIMD) simulations, we scrutinize the excited electronic states (T1 , T2 , and S1 ) subsequent to 213 nm excitation. Our findings demonstrate that α-carbonyl C-C bond-breaking in triplet states exhibits markedly lower barriers than in singlet states (below 5.0 kcal mol-1 ). AIMD simulations corroborate the potential involvement of triplet states in amino acid fragmentation, underscoring the significance of accounting for these states in photochemistry. Chemical bonding analyses unveil distinctive patterns for S1 and T1 states, with the asymmetric redistribution of electron density characterizing the C-C breaking in triplet states, in contrast to the symmetric breaking observed in singlet states. This research complements recent experimental discoveries, enhancing our comprehension of amino acid reactions in the interstellar medium.
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Affiliation(s)
- Cristian Guerra
- Universidad Andrés Bello, Centro de Química Teórica y Computacional (CQTC), Facultad de Ciencias Exactas, Avenida República 275, 8370146, Santiago de Chile, Chile
- Universidad Autónoma de Chile, Facultad de Ingeniería, Avenida Pedro de Valdivia 425, 7500912, Santiago de Chile, Chile
- Universidad de Córdoba, Grupo de Química Computacional, Facultad de Ciencias Básicas, Carrera 6 No. 77-305, Montería-Córdoba, Colombia
| | - Yeray A Rodríguez-Núñez
- Universidad Andrés Bello, Centro de Química Teórica y Computacional (CQTC), Facultad de Ciencias Exactas, Avenida República 275, 8370146, Santiago de Chile, Chile
| | - Adolfo E Ensuncho
- Universidad de Córdoba, Grupo de Química Computacional, Facultad de Ciencias Básicas, Carrera 6 No. 77-305, Montería-Córdoba, Colombia
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6
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Jin B, Huo B, Yuan C, Li SD, Wu YB. [(OB) 2-M©B 7O 7-BO] - (M = Mn, Tc, Re): Chemically Stable and Triply Aromatic Ballet Rotors. Inorg Chem 2023. [PMID: 38032749 DOI: 10.1021/acs.inorgchem.3c02623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2023]
Abstract
Single-molecule nanorotors are generally constructed based on boron atoms to obtain structural fluxionality via possessing the delocalized multicenter bonds. However, the electron-deficient boron atoms are commonly exposed in these nanorotors, which leads to extremely high chemical reactivity, which blocks the synthesis in the condensed phase. In this work, we computationally designed a series of transition-metal-doped boron oxide clusters MB10O10- (in structural configuration of [(OB)2-M©B7O7-BO]-, M = Mn, Tc, Re, © means "centered" in a planar or quasi-planar hypercoordinate environment), which can be vividly named as "ballet rotors" to label their anthropomorphic dynamic rotational behaviors. The rotational fluxionality in ballet rotors originates from the completely delocalized nature of the bonding within their MB10 core moieties. Remarkably, compared with single-molecule nanorotors having bare boron atoms and the narrow HOMO-LUMO gaps (≤4.00 eV) as well as low vertical detachment energies (VDEs, ≤4.46 eV for anions), the ballet rotors possess significantly improved chemical stability, as evidenced sterically by the absence of exposed boron atoms and electronically by much wider HOMO-LUMO gaps (5.66-5.98 eV) as well as obviously higher VDEs between 5.36 and 5.47 eV. Specifically, the ballet rotors are mainly stabilized by the delicately placed peripheral oxygen atoms, which can compensate for all electron-deficient boron atoms via O → B π back bonds and sterically protect them. Simultaneously, they are additionally stabilized by aromatic stabilization effect from possessing the novel S + P + D triple aromaticity. We expect that the proposal of chemically stable ballet rotors in this work can arouse the rational design of nanorotors for experimental realization in the condensed phase.
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Affiliation(s)
- Bo Jin
- Key Laboratory of Materials for Energy Conversion and Storage of Shanxi Province, Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education, Institute of Molecular Science, Shanxi University, Taiyuan 030006, People's Republic of China
| | - Bin Huo
- Key Laboratory of Materials for Energy Conversion and Storage of Shanxi Province, Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education, Institute of Molecular Science, Shanxi University, Taiyuan 030006, People's Republic of China
| | - Caixia Yuan
- Key Laboratory of Materials for Energy Conversion and Storage of Shanxi Province, Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education, Institute of Molecular Science, Shanxi University, Taiyuan 030006, People's Republic of China
| | - Si-Dian Li
- Key Laboratory of Materials for Energy Conversion and Storage of Shanxi Province, Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education, Institute of Molecular Science, Shanxi University, Taiyuan 030006, People's Republic of China
| | - Yan-Bo Wu
- Key Laboratory of Materials for Energy Conversion and Storage of Shanxi Province, Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education, Institute of Molecular Science, Shanxi University, Taiyuan 030006, People's Republic of China
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7
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Beran GJO. Frontiers of molecular crystal structure prediction for pharmaceuticals and functional organic materials. Chem Sci 2023; 14:13290-13312. [PMID: 38033897 PMCID: PMC10685338 DOI: 10.1039/d3sc03903j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Accepted: 11/02/2023] [Indexed: 12/02/2023] Open
Abstract
The reliability of organic molecular crystal structure prediction has improved tremendously in recent years. Crystal structure predictions for small, mostly rigid molecules are quickly becoming routine. Structure predictions for larger, highly flexible molecules are more challenging, but their crystal structures can also now be predicted with increasing rates of success. These advances are ushering in a new era where crystal structure prediction drives the experimental discovery of new solid forms. After briefly discussing the computational methods that enable successful crystal structure prediction, this perspective presents case studies from the literature that demonstrate how state-of-the-art crystal structure prediction can transform how scientists approach problems involving the organic solid state. Applications to pharmaceuticals, porous organic materials, photomechanical crystals, organic semi-conductors, and nuclear magnetic resonance crystallography are included. Finally, efforts to improve our understanding of which predicted crystal structures can actually be produced experimentally and other outstanding challenges are discussed.
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Affiliation(s)
- Gregory J O Beran
- Department of Chemistry, University of California Riverside Riverside CA 92521 USA
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8
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Sheta SM, Hamouda MA, Ali OI, Kandil AT, Sheha RR, El-Sheikh SM. Recent progress in high-performance environmental impacts of the removal of radionuclides from wastewater based on metal-organic frameworks: a review. RSC Adv 2023; 13:25182-25208. [PMID: 37622006 PMCID: PMC10445089 DOI: 10.1039/d3ra04177h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Accepted: 08/01/2023] [Indexed: 08/26/2023] Open
Abstract
The nuclear industry is rapidly developing and the effective management of nuclear waste and monitoring the nuclear fuel cycle are crucial. The presence of various radionuclides such as uranium (U), europium (Eu), technetium (Tc), iodine (I), thorium (Th), cesium (Cs), and strontium (Sr) in the environment is a major concern, and the development of materials with high adsorption capacity and selectivity is essential for their effective removal. Metal-organic frameworks (MOFs) have recently emerged as promising materials for removing radioactive elements from water resources due to their unique properties such as tunable pore size, high surface area, and chemical structure. This review provides an extensive analysis of the potential of MOFs as adsorbents for purifying various radionuclides rather than using different techniques such as precipitation, filtration, ion exchange, electrolysis, solvent extraction, and flotation. This review discusses various MOF fabrication methods, focusing on minimizing environmental impacts when using organic solvents and solvent-free methods, and covers the mechanism of MOF adsorption towards radionuclides, including macroscopic and microscopic views. It also examines the effectiveness of MOFs in removing radionuclides from wastewater, their behavior on exposure to high radiation, and their renewability and reusability. We conclude by emphasizing the need for further research to optimize the performance of MOFs and expand their use in real-world applications. Overall, this review provides valuable insights into the potential of MOFs as efficient and durable materials for removing radioactive elements from water resources, addressing a critical issue in the nuclear industry.
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Affiliation(s)
- Sheta M Sheta
- Inorganic Chemistry Department, National Research Centre 33 El-Behouth St., Dokki Giza 12622 Egypt +201009697356
| | - Mohamed A Hamouda
- Chemistry Department, Faculty of Science, Helwan University Ain Helwan Cairo 11795 Egypt +201098052633
| | - Omnia I Ali
- Chemistry Department, Faculty of Science, Helwan University Ain Helwan Cairo 11795 Egypt +201098052633
| | - A T Kandil
- Chemistry Department, Faculty of Science, Helwan University Ain Helwan Cairo 11795 Egypt +201098052633
| | - Reda R Sheha
- Nuclear Chem. Dept., Hot Lab Center, Egyptian Atomic Energy Authority P. O. 13759 Cairo Egypt +20-27142451 +201022316076
| | - Said M El-Sheikh
- Nanomaterials and Nanotechnology Department, Central Metallurgical R & D Institute Cairo 11421 Egypt
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9
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Dunlap JH, Ethier JG, Putnam-Neeb AA, Iyer S, Luo SXL, Feng H, Garrido Torres JA, Doyle AG, Swager TM, Vaia RA, Mirau P, Crouse CA, Baldwin LA. Continuous flow synthesis of pyridinium salts accelerated by multi-objective Bayesian optimization with active learning. Chem Sci 2023; 14:8061-8069. [PMID: 37538827 PMCID: PMC10395269 DOI: 10.1039/d3sc01303k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Accepted: 06/19/2023] [Indexed: 08/05/2023] Open
Abstract
We report a human-in-the-loop implementation of the multi-objective experimental design via a Bayesian optimization platform (EDBO+) towards the optimization of butylpyridinium bromide synthesis under continuous flow conditions. The algorithm simultaneously optimized reaction yield and production rate (or space-time yield) and generated a well defined Pareto front. The versatility of EDBO+ was demonstrated by expanding the reaction space mid-campaign by increasing the upper temperature limit. Incorporation of continuous flow techniques enabled improved control over reaction parameters compared to common batch chemistry processes, while providing a route towards future automated syntheses and improved scalability. To that end, we applied the open-source Python module, nmrglue, for semi-automated nuclear magnetic resonance (NMR) spectroscopy analysis, and compared the acquired outputs against those obtained through manual processing methods from spectra collected on both low-field (60 MHz) and high-field (400 MHz) NMR spectrometers. The EDBO+ based model was retrained with these four different datasets and the resulting Pareto front predictions provided insight into the effect of data analysis on model predictions. Finally, quaternization of poly(4-vinylpyridine) with bromobutane illustrated the extension of continuous flow chemistry to synthesize functional materials.
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Affiliation(s)
- John H Dunlap
- Materials and Manufacturing Directorate, Air Force Research Laboratory Wright-Patterson AFB OH 45433 USA
- UES, Inc. Dayton OH 45431 USA
| | - Jeffrey G Ethier
- Materials and Manufacturing Directorate, Air Force Research Laboratory Wright-Patterson AFB OH 45433 USA
- UES, Inc. Dayton OH 45431 USA
| | - Amelia A Putnam-Neeb
- Materials and Manufacturing Directorate, Air Force Research Laboratory Wright-Patterson AFB OH 45433 USA
- National Research Council Research Associate, Air Force Research Laboratory Wright-Patterson AFB OH 45433 USA
| | - Sanjay Iyer
- Department of Chemistry, Purdue University West Lafayette IN 47907 USA
| | - Shao-Xiong Lennon Luo
- Department of Chemistry, Massachusetts Institute of Technology Cambridge MA 02139 USA
| | - Haosheng Feng
- Department of Chemistry, Massachusetts Institute of Technology Cambridge MA 02139 USA
| | | | - Abigail G Doyle
- Department of Chemistry and Biochemistry, University of California Los Angeles CA 90095 USA
| | - Timothy M Swager
- Department of Chemistry, Massachusetts Institute of Technology Cambridge MA 02139 USA
| | - Richard A Vaia
- Materials and Manufacturing Directorate, Air Force Research Laboratory Wright-Patterson AFB OH 45433 USA
| | - Peter Mirau
- Materials and Manufacturing Directorate, Air Force Research Laboratory Wright-Patterson AFB OH 45433 USA
| | - Christopher A Crouse
- Materials and Manufacturing Directorate, Air Force Research Laboratory Wright-Patterson AFB OH 45433 USA
| | - Luke A Baldwin
- Materials and Manufacturing Directorate, Air Force Research Laboratory Wright-Patterson AFB OH 45433 USA
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10
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Ritch JS. Chalcogen-substituted carbenes: a density functional study of structure, stability, and donor ability. RSC Adv 2023; 13:16828-16836. [PMID: 37283867 PMCID: PMC10240176 DOI: 10.1039/d3ra03324d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Accepted: 05/26/2023] [Indexed: 06/08/2023] Open
Abstract
Chalcogen-substituted carbenes are examined computationally using density functional theory. Several approaches are used to assess the stability and reactivity of chalcogenazol-2-ylidene carbenes (NEHCs; E = O, S, Se, Te). The known unsaturated species 1,3-dimethylimidazol-2-ylidene is studied at the same level of theory as the NEHC molecules, as a reference. Electronic structures, stability towards dimerization, and ligand properties are discussed. The results highlight the NEHCs as potentially valuable ancillary ligands for stabilizing low-valent metals or paramagnetic main group molecules. A simple, effective computational method for evaluating σ donor ability and π acidity of carbenes is presented.
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Affiliation(s)
- Jamie S Ritch
- Department of Chemistry, The University of Winnipeg 515 Portage Avenue Winnipeg MB R3B 2E9 Canada +1-204-774-2401 +1-204-786-9730
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11
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Asthana A, Kumar A, Abraham V, Grimsley H, Zhang Y, Cincio L, Tretiak S, Dub PA, Economou SE, Barnes E, Mayhall NJ. Quantum self-consistent equation-of-motion method for computing molecular excitation energies, ionization potentials, and electron affinities on a quantum computer. Chem Sci 2023; 14:2405-2418. [PMID: 36873839 PMCID: PMC9977410 DOI: 10.1039/d2sc05371c] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Accepted: 01/26/2023] [Indexed: 01/30/2023] Open
Abstract
Near-term quantum computers are expected to facilitate material and chemical research through accurate molecular simulations. Several developments have already shown that accurate ground-state energies for small molecules can be evaluated on present-day quantum devices. Although electronically excited states play a vital role in chemical processes and applications, the search for a reliable and practical approach for routine excited-state calculations on near-term quantum devices is ongoing. Inspired by excited-state methods developed for the unitary coupled-cluster theory in quantum chemistry, we present an equation-of-motion-based method to compute excitation energies following the variational quantum eigensolver algorithm for ground-state calculations on a quantum computer. We perform numerical simulations on H2, H4, H2O, and LiH molecules to test our quantum self-consistent equation-of-motion (q-sc-EOM) method and compare it to other current state-of-the-art methods. q-sc-EOM makes use of self-consistent operators to satisfy the vacuum annihilation condition, a critical property for accurate calculations. It provides real and size-intensive energy differences corresponding to vertical excitation energies, ionization potentials and electron affinities. We also find that q-sc-EOM is more suitable for implementation on NISQ devices as it is expected to be more resilient to noise compared with the currently available methods.
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Affiliation(s)
- Ayush Asthana
- Department of Chemistry, Virginia Tech Blacksburg 24061 VA USA
- Virginia Tech Center for Quantum Information Science and Engineering Blacksburg 24061 VA USA
| | - Ashutosh Kumar
- Theoretical Division, Los Alamos National Laboratory Los Alamos 87545 NM USA
| | - Vibin Abraham
- Department of Chemistry, University of Michigan Ann Arbor 48109 MI USA
| | - Harper Grimsley
- Department of Chemistry, Virginia Tech Blacksburg 24061 VA USA
- Virginia Tech Center for Quantum Information Science and Engineering Blacksburg 24061 VA USA
| | - Yu Zhang
- Theoretical Division, Los Alamos National Laboratory Los Alamos 87545 NM USA
| | - Lukasz Cincio
- Theoretical Division, Los Alamos National Laboratory Los Alamos 87545 NM USA
| | - Sergei Tretiak
- Theoretical Division, Los Alamos National Laboratory Los Alamos 87545 NM USA
- Center for Integrated Nanotechnologies, Los Alamos National Laboratory Los Alamos 87545 NM USA
| | - Pavel A Dub
- Chemistry Division, Los Alamos National Laboratory Los Alamos 87545 NM USA
| | - Sophia E Economou
- Department of Physics, Virginia Tech Blacksburg 24061 VA USA
- Virginia Tech Center for Quantum Information Science and Engineering Blacksburg 24061 VA USA
| | - Edwin Barnes
- Department of Physics, Virginia Tech Blacksburg 24061 VA USA
- Virginia Tech Center for Quantum Information Science and Engineering Blacksburg 24061 VA USA
| | - Nicholas J Mayhall
- Department of Chemistry, Virginia Tech Blacksburg 24061 VA USA
- Virginia Tech Center for Quantum Information Science and Engineering Blacksburg 24061 VA USA
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12
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Schwab JH, Bailey JB, Gembicky M, Stauber JM. Programmable synthesis of well-defined, glycosylated iron(ii) supramolecular assemblies with multivalent protein-binding capabilities. Chem Sci 2023; 14:1018-1026. [PMID: 36755719 PMCID: PMC9890585 DOI: 10.1039/d2sc05689e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Accepted: 12/20/2022] [Indexed: 12/24/2022] Open
Abstract
Multivalency plays a key role in achieving strong, yet reversible interactions in nature, and provides critical chemical organization in biological recognition processes. Chemists have taken an interest in designing multivalent synthetic assemblies to both better understand the underlying principles governing these interactions, and to build chemical tools that either enhance or prevent such recognition events from occurring in biology. Rationally tailoring synthetic strategies to achieve the high level of chemical control and tunability required to mimic these interactions, however, is challenging. Here, we introduce a systematic and modular synthetic approach to the design of well-defined molecular multivalent protein-binding constructs that allows for control over size, morphology, and valency. A series of supramolecular mono-, bi-, and tetrametallic Fe(ii) complexes featuring a precise display of peripheral saccharides was prepared through coordination-driven self-assembly from simple building blocks. The molecular assemblies are fully characterized, and we present the structural determination of one complex in the series. The mannose and maltose-appended assemblies display strong multivalent binding to model lectin, Concanavalin A (K d values in μM), where the strength of the binding is a direct consequence of the number of saccharide units decorating the molecular periphery. This versatile synthetic strategy provides chemical control while offering an easily accessible approach to examine important design principles governing structure-function relationships germane to biological recognition and binding properties.
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Affiliation(s)
- Jake H. Schwab
- Department of Chemistry and Biochemistry, University of California9500 Gilman Dr, La JollaSan DiegoCAUSA
| | - Jake B. Bailey
- Department of Chemistry and Biochemistry, University of California9500 Gilman Dr, La JollaSan DiegoCAUSA
| | - Milan Gembicky
- Department of Chemistry and Biochemistry, University of California 9500 Gilman Dr, La Jolla San Diego CA USA
| | - Julia M. Stauber
- Department of Chemistry and Biochemistry, University of California9500 Gilman Dr, La JollaSan DiegoCAUSA
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Oliveira RL, Pisarek M, Ledwa KA, Pasternak G, Kepinski L. Enhanced activation of persulfate improves the selective oxidation of alcohols catalyzed by earth-abundant metal oxides embedded on porous N-doped carbon derived from chitosan. REACT CHEM ENG 2023. [DOI: 10.1039/d2re00566b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Metal clusters oxide were embedded in an N-doped carbon and used as catalysts for the activation of peroxydisulfate or peroxymonosulfate in the selective oxidation of benzyl alcohol. Quenching tests were done to investigate the reaction mechanism.
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Affiliation(s)
- Rafael L. Oliveira
- Institute of Low Temperature and Structure Research of the Polish Academy of Sciences, Poland
| | - Marcin Pisarek
- Institute of Physical Chemistry of the Polish Academy of Sciences, Poland
| | - Karolina A. Ledwa
- Institute of Low Temperature and Structure Research of the Polish Academy of Sciences, Poland
| | - Grzegorz Pasternak
- Faculty of Chemistry, Wroclaw University of Science and Technology, Poland
| | - Leszek Kepinski
- Institute of Low Temperature and Structure Research of the Polish Academy of Sciences, Poland
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