Recent advances in the chemistry and applications of N-heterocyclic carbenes

Nature Reviews Chemistry, Journal Year: 2021, Volume and Issue: 5(10), P. 711 - 725

Published: Sept. 3, 2021

Language: Английский

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Computational Ligand Descriptors for Catalyst Design

Chemical Reviews, Journal Year: 2019, Volume and Issue: 119(11), P. 6561 - 6594

Published: Feb. 25, 2019

Ligands, especially phosphines and carbenes, can play a key role in modifying controlling homogeneous organometallic catalysts, they often provide convenient approach to fine-tuning the performance of known catalysts. The measurable outcomes such catalyst modifications (yields, rates, selectivity) be set into context by establishing their relationship steric electronic descriptors ligand properties, models guide discovery, optimization, design In this review we present survey calculated descriptors, with particular focus on catalysis. A range different approaches calculating parameters are out compared, have collected for representative sets, including 30 monodentate phosphorus(III) donor ligands, 23 bidentate P,P-donor view providing useful resource analysis practitioners. addition, several case studies applications covering both maps models, been reviewed, illustrating how descriptor-led catalysis inform experiments highlighting good practice model comparison evaluation.

Language: Английский

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A review on dry reforming of methane over perovskite derived catalysts

Catalysis Today, Journal Year: 2020, Volume and Issue: 365, P. 2 - 23

Published: Nov. 12, 2020

Language: Английский

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Recent Progress with Pincer Transition Metal Catalysts for Sustainability

Catalysts, Journal Year: 2020, Volume and Issue: 10(7), P. 773 - 773

Published: July 11, 2020

Our planet urgently needs sustainable solutions to alleviate the anthropogenic global warming and climate change. Homogeneous catalysis has potential play a fundamental role in this process, providing novel, efficient, at same time eco-friendly routes for both chemicals energy production. In particular, pincer-type ligation shows promising properties terms of long-term stability selectivity, as well allowing mild reaction conditions low catalyst loading. Indeed, pincer complexes have been applied plethora chemical processes, such hydrogen release, CO2 capture conversion, N2 fixation, biomass valorization synthesis high-value fuels. work, we show main advances last five years use transition metal key catalytic processes aiming more

Language: Английский

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Recent progress on NHC-stabilized early transition metal (group 3–7) complexes: Synthesis and applications

Coordination Chemistry Reviews, Journal Year: 2020, Volume and Issue: 422, P. 213411 - 213411

Published: July 24, 2020

Language: Английский

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IPr# – highly hindered, broadly applicable N-heterocyclic carbenes

Chemical Science, Journal Year: 2021, Volume and Issue: 12(31), P. 10583 - 10589

Published: Jan. 1, 2021

We report novel, sterically-bulky, easily-accessible NHC ligands based on the hash peralkylation concept. The new have been commercialized in collaboration with Millipore Sigma: IPr#HCl, 915653; Np#HCl; 915912; BIAN-IPr#HCl, 916420.

Language: Английский

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Lipid Peroxidation in Muscle Foods: Impact on Quality, Safety and Human Health

Foods, Journal Year: 2024, Volume and Issue: 13(5), P. 797 - 797

Published: March 4, 2024

The issue of lipid changes in muscle foods under the action atmospheric oxygen has captured attention researchers for over a century. Lipid oxidative processes initiate during slaughtering animals and persist throughout subsequent technological processing storage finished product. oxidation lipids is phenomenon extensively deliberated scientific community, acknowledged as one pivotal factors affecting their quality, safety, human health. This review delves into nature foods, highlighting mechanisms free radical initiation propagation processes. Special given to natural antioxidant protective system dietary influencing stability lipids. traces inhibiting processes, exploring how substrates, prooxidant activity, play role. A critical safety meat products provided. impact on quality including flavour, aroma, taste, colour, texture, scrutinised. Additionally, monitors effect oxidised health, particularly relation autooxidation cholesterol. Associations with coronary cardiovascular disease, brain stroke, carcinogenesis linked stress, various infections are discussed. Further studies also needed formulate appropriate solutions reduce risk chemical hazards caused by development peroxidation foods.

Language: Английский

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Applications of Luminescent Cyclometalated Metal Complexes as Sensors and Switches

Synlett, Journal Year: 2025, Volume and Issue: unknown

Published: March 19, 2025

Abstract Cyclometalated complexes, including those with pincer ligands and other chelating frameworks, such as porphyrin rings polyenes, have garnered significant attention due to their diverse applications in ion analyte detection across synthetic chemistry, environmental monitoring, medicine, electronics. These complexes exhibit fascinating chromic behaviors, mechanochromism, chemochromism, vapochromism, which are particularly useful sensing applications. Of particular interest photophysical properties, especially involving lanthanides, offer unique luminescent optical characteristics. Metals nickel (Ni), palladium (Pd), ruthenium (Ru), gold (Au), rhodium (Rh) been extensively studied order understand photochemical activity explore potential light-emitting devices, photo-induced electron transfer, technologies. Their vapochromic mechanochromic properties make them highly attractive for sensing, while photoluminescent capabilities enhance utility optoelectronic devices practical This review provides a comprehensive overview of applications, gas, cation, anion sensing. The discussion also highlights the need incorporate specific examples that demonstrate suitability these targeted tasks, further emphasizing promise advancing sensor device 1 Introduction 2 Strategies 3 Applications 4 Other Miscellaneous Examples 5 Drawbacks Limitations 6 Conclusion Perspectives 7 List Abbreviations Definitions

Language: Английский

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Electron Paramagnetic Resonance Signature of Tetragonal Low Spin Iron(V)-Nitrido and -Oxo Complexes Derived from the Electronic Structure Analysis of Heme and Non-Heme Archetypes

Journal of the American Chemical Society, Journal Year: 2019, Volume and Issue: 141(6), P. 2421 - 2434

Published: Jan. 8, 2019

Iron(V)-nitrido and -oxo complexes have been proposed as key intermediates in a diverse array of chemical transformations. Herein we present detailed electronic-structure analysis [FeV(N)(TPP)] (1, TPP2– = tetraphenylporphyrinato), [FeV(N)(cyclam-ac)]+ (2, cyclam-ac 1,4,8,11-tetraazacyclotetradecane-1-acetato) using electron paramagnetic resonance (EPR) 57Fe Mössbauer spectroscopy coupled with wave function based complete active-space self-consistent field (CASSCF) calculations. The findings were compared all other well-characterized genuine iron(V)-nitrido complexes, [FeV(N)(MePy2tacn)](PF6)2 (3, MePy2tacn methyl-N′,N″-bis(2-picolyl)-1,4,7-triazacyclononane), [FeV(N){PhB(t-BuIm)3}]+ (4, PhB(tBuIm)3– phenyltris(3-tert-butylimidazol-2-ylidene)borate), [FeV(O)(TAML)]− (5, TAML4– tetraamido macrocyclic ligand). Our results revealed that complex 1 is an authenticated species contrasts its oxo congener, compound I, which contains ferryl unit interacting porphyrin radical. More importantly, tetragonal 1–3 5 possess orbitally nearly doubly degenerate S 1/2 ground state. Consequently, analogous near-axial EPR spectra g|| < g⊥ ≤ 2 measured for them, their values found to obey simple relation g⊥2 + (2 – g∥)2 4. However, the bonding situation trigonal 4 completely different evidenced by distinct spectrum g⊥. Further in-depth analyses suggested low spin feature electronic structures akin those 5. Therefore, characteristic signals determined can be used spectroscopic marker identify such highly reactive catalytic processes.

Language: Английский

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Cyclic iron tetra N-heterocyclic carbenes: synthesis, properties, reactivity, and catalysis

Chemical Society Reviews, Journal Year: 2023, Volume and Issue: 52(6), P. 2238 - 2277

Published: Jan. 1, 2023

Cyclic iron tetracarbenes structurally resemble porphyrins, but the strong equatorial σ-donation results in a different electronic structure and reactivity.

Language: Английский

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