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Olive LN, Heide AD, Turney JM, Schaefer HF. Ethynyl Radical Hydrogen Abstraction Energetics and Kinetics Utilizing High-Level Theory. ACS EARTH & SPACE CHEMISTRY 2024; 8:1349-1358. [PMID: 39045226 PMCID: PMC11261607 DOI: 10.1021/acsearthspacechem.4c00040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/01/2024] [Revised: 06/12/2024] [Accepted: 06/25/2024] [Indexed: 07/25/2024]
Abstract
The ethynyl radical, C2H, is found in a variety of different environments ranging from interstellar space and planetary atmospheres to playing an important role in the combustion of various alkynes under fuel-rich conditions. Hydrogen-atom abstraction reactions are common for the ethynyl radical in these contrasting environments. In this study, the C2H + HX → C2H2 + X, where HX = HNCO, trans-HONO, cis-HONO, C2H4, and CH3OH, reactions have been investigated at rigorously high levels of theory, including CCSD(T)-F12a/cc-pVTZ-F12. For the stationary points thus located, much higher levels of theory have been used, with basis sets as large as aug-cc-pV5Z and methods up to CCSDT(Q), and core correlation was also included. These molecules were chosen because they can be found in either interstellar or combustion environments. Various additive energy corrections have been included to converge the relative enthalpies of the stationary points to subchemical accuracy (≤0.5 kcal mol-1). Barriers predicted here (2.19 kcal mol-1 for the HNCO reaction and 0.47 kcal mol-1 for C2H4) are significantly lower than previous predictions. Reliable kinetics were acquired over a wide range of temperatures (50-5000 K), which may be useful for future experimental studies of these reactions.
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Affiliation(s)
- Laura N Olive
- Center for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602, United States
| | - Alexandra D Heide
- Center for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602, United States
| | - Justin M Turney
- Center for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602, United States
| | - Henry F Schaefer
- Center for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602, United States
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2
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Melli A, Tonolo F, Barone V, Puzzarini C. Extending the Applicability of the Semi-experimental Approach by Means of "Template Molecule" and "Linear Regression" Models on Top of DFT Computations. J Phys Chem A 2021; 125:9904-9916. [PMID: 34752702 PMCID: PMC8607424 DOI: 10.1021/acs.jpca.1c07828] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Revised: 10/20/2021] [Indexed: 11/28/2022]
Abstract
The accurate determination of equilibrium structures for isolated molecules plays a central role in the evaluation and interpretation of stereoelectronic, thermodynamic, and spectroscopic properties. For small semi-rigid systems, state-of-the-art quantum-chemical computations can rival the most sophisticated experimental results. For larger molecules, cheaper yet accurate approaches need to be defined. The double-hybrid rev-DSD-PBEP86 functional already delivers remarkable results that can be further improved by means of a "Lego brick" model. This is based on the idea that a molecular system can be seen as formed by different fragments (the "Lego bricks"), whose accurate semi-experimental (SE) equilibrium geometries are available. The template molecule (TM) approach can be used to account for the modifications occurring when going from the isolated fragment to the molecular system under investigation, with the linear regression (LR) model employed to correct the linkage between the different fragments. The resulting TM-SE_LR approach has been tested with respect to available SE equilibrium structures and rotational constants. Indeed, the latter parameters straightforwardly depend on the equilibrium geometry of the system under consideration. The main outcome of our study is the reliability, robustness, and accuracy of this novel approach. The molecular systems considered for benchmarking the TM-SE_LR scheme are those formally issued from addition/elimination reactions of nucleophilic unsaturated radicals (e.g., CN, C2H, and phenyl) to alkenes, imines, and aldehydes, whose rotational spectra have been investigated, but accurate structural determinations are not yet available.
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Affiliation(s)
- Alessio Melli
- Scuola
Normale Superiore, Piazza dei Cavalieri 7, 56126 Pisa, Italy
- Dipartimento
di Chimica “Giacomo Ciamician”, Università di Bologna, Via Selmi 2, 40126 Bologna, Italy
| | - Francesca Tonolo
- Scuola
Normale Superiore, Piazza dei Cavalieri 7, 56126 Pisa, Italy
- Dipartimento
di Chimica “Giacomo Ciamician”, Università di Bologna, Via Selmi 2, 40126 Bologna, Italy
| | - Vincenzo Barone
- Scuola
Normale Superiore, Piazza dei Cavalieri 7, 56126 Pisa, Italy
| | - Cristina Puzzarini
- Dipartimento
di Chimica “Giacomo Ciamician”, Università di Bologna, Via Selmi 2, 40126 Bologna, Italy
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3
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Metal-catalyst-free gas-phase synthesis of long-chain hydrocarbons. Nat Commun 2021; 12:5937. [PMID: 34642345 PMCID: PMC8511129 DOI: 10.1038/s41467-021-26184-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Accepted: 09/15/2021] [Indexed: 12/23/2022] Open
Abstract
Development of sustainable processes for hydrocarbons synthesis is a fundamental challenge in chemistry since these are of unquestionable importance for the production of many essential synthetic chemicals, materials and carbon-based fuels. Current industrial processes rely on non-abundant metal catalysts, temperatures of hundreds of Celsius and pressures of tens of bars. We propose an alternative gas phase process under mild reaction conditions using only atomic carbon, molecular hydrogen and an inert carrier gas. We demonstrate that the presence of CH2 and H radicals leads to efficient C-C chain growth, producing micron-length fibres of unbranched alkanes with an average length distribution between C23-C33. Ab-initio calculations uncover a thermodynamically favourable methylene coupling process on the surface of carbonaceous nanoparticles, which is kinematically facilitated by a trap-and-release mechanism of the reactants and nanoparticles that is confirmed by a steady incompressible flow simulation. This work could lead to future alternative sustainable synthetic routes to critical alkane-based chemicals or fuels. There is an urgent need of cleaner and energy-efficient technologies for future sustainable chemicals and fuels. Here the authors report the gas phase synthesis of long hydrocarbon chains from atomic carbon and molecular hydrogen precursors in an inert carrier gas, avoiding the use of metal catalysts.
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Dash MR, Muthiah B, Mishra SS, Annaraj B, Lin KC. Kinetic insights into ethynyl radical with isobutane and neopentane. Theor Chem Acc 2021. [DOI: 10.1007/s00214-021-02833-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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5
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Bowman MC, Burke AD, Turney JM, Schaefer III HF. Conclusive determination of ethynyl radical hydrogen abstraction energetics and kinetics*. Mol Phys 2020. [DOI: 10.1080/00268976.2020.1769214] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Michael C. Bowman
- Center for Computational Quantum Chemistry, University of Georgia, Athens, GA, USA
- Department of Chemistry and Biochemistry, Taylor University, Upland, IN, USA
| | - Alexandra D. Burke
- Center for Computational Quantum Chemistry, University of Georgia, Athens, GA, USA
| | - Justin M. Turney
- Center for Computational Quantum Chemistry, University of Georgia, Athens, GA, USA
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6
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Baidya B, Chandra AK. Theoretical investigation on atmospheric chemistry of (CF3)2C=CH2: Reaction with OH radical. Chem Phys Lett 2020. [DOI: 10.1016/j.cplett.2020.137409] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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7
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Huang Z, Ma X, Xu F, Zuo C, Wei Y, Wang W, Sun Y, Zhang Q. Theoretical study of the formation of dinitro-pyrenes from mononitro-pyrenes initiated by OH radicals. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2019.05.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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8
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Rao PK, Deka RC, Gour NK, Gejji SP. Understanding the Atmospheric Oxidation of HFE-7500 (C3F7CF(OC2H5)CF(CF3)2) Initiated by Cl Atom and NO3 Radical from Theory. J Phys Chem A 2018; 122:6799-6808. [DOI: 10.1021/acs.jpca.8b04225] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Pradeep Kumar Rao
- Department of Chemistry, DDU Gorakhpur University, Gorakhpur 273009, India
| | - Ramesh Ch. Deka
- Department of Chemical Sciences, Tezpur University, Tezpur, Assam 784028, India
| | - Nand Kishor Gour
- Department of Chemical Sciences, Tezpur University, Tezpur, Assam 784028, India
| | - Shridhar P. Gejji
- Department of Chemistry, Savitribai Phule Pune University, Pune 411007, India
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Rao PK, Gejji SP. Atmospheric degradation of HCFO-1233zd(E) initiated by OH radical, Cl atom and O3 molecule: Kinetics, reaction mechanisms and implications. J Fluor Chem 2018. [DOI: 10.1016/j.jfluchem.2018.05.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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10
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Jana K, Ganguly B. DFT studies on quantum mechanical tunneling in tautomerization of three-membered rings. Phys Chem Chem Phys 2018; 20:28049-28058. [DOI: 10.1039/c8cp03963a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Amino–imino and keto–enol tautomerization processes in three-membered ring systems have been explored to examine the role of quantum mechanical tunneling along with aromaticity. The DFT calculations shed light on the role of aromaticity in tautomerization processes and as perceived this property may not contribute entirely to facilitate the formation of tautomeric forms.
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Affiliation(s)
- Kalyanashis Jana
- Computation and Simulation Unit (Analytical Discipline and Centralized Instrument Facility)
- CSIR-Central Salt and Marine Chemicals Research Institute
- Bhavnagar-364002
- India
- Academy of Scientific and Innovative Research
| | - Bishwajit Ganguly
- Computation and Simulation Unit (Analytical Discipline and Centralized Instrument Facility)
- CSIR-Central Salt and Marine Chemicals Research Institute
- Bhavnagar-364002
- India
- Academy of Scientific and Innovative Research
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11
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Gour NK, Sarma PJ, Mishra BK, Deka RC. Quantum calculation on night-time degradation of 2-chloroethyl ethyl ether (CH3CH2OCH2CH2Cl) initiated by NO3 radical. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2017. [DOI: 10.1142/s0219633617500687] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
A dual-level quantum chemical calculations have been carried out on the initiation of night-time degradation of 2-chloroethyl ethyl ether (CH3CH2OCH2CH2Cl) via H-abstraction by NO3 radical. Within the scope of density functional theory, the electronic structure of all the species involved in the titled reaction has been optimized at M06-2X functional along with 6-31[Formula: see text]G(d,p) basis set. A higher level of couple cluster CCSD(T) method in conjunction with 6-311[Formula: see text]G(d,p) basis set has been used for the refined energy of the species. All minima and saddle states involved in the reaction channel have been characterized on the potential energy surface (PES). From PES, it is confirmed that H-abstraction from methylene (–CH2–) of ethyl (CH3CH2–) part of CH3CH2OCH2CH2Cl follows the minimum energy path. The rate constants (individual and overall) of the titled reaction are obtained using Canonical Transition State Theory (CTST) over the temperature range of 250–350[Formula: see text]K. The atmospheric lifetime and radiative efficiency of the titled molecule have also been estimated, amounting to 0.23 years and 0.024 years, respectively. The Global Warming Potentials of the 2-chloroethyl ethyl ether in 20 years, 100 years and 500 years time horizon were found to be 0.13, 0.04 and 0.01, respectively.
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Affiliation(s)
- Nand Kishor Gour
- Department of Chemical Sciences, Tezpur, University Tezpur, Napaam, Assam 784 028, India
| | - Plaban Jyoti Sarma
- Department of Chemical Sciences, Tezpur, University Tezpur, Napaam, Assam 784 028, India
| | - Bhupesh Kumar Mishra
- Department of Chemistry, D. N. Govt. College, Itanagar, Arunachal Pradesh 791113, India
| | - Ramesh Chandra Deka
- Department of Chemical Sciences, Tezpur, University Tezpur, Napaam, Assam 784 028, India
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12
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Pei L, Dong K, Tang Y, Zhang B, Yu C, Li W. Theoretical studies of the decomposition mechanisms of 1,2,4-butanetriol trinitrate. J Mol Model 2017; 24:6. [DOI: 10.1007/s00894-017-3541-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2017] [Accepted: 11/22/2017] [Indexed: 11/30/2022]
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13
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Molecular insights for the HFO-1345fz +X (X = Cl, O3 or NO3) reaction and fate of alkoxy radicals initiated by Cl: DFT investigations. J Fluor Chem 2017. [DOI: 10.1016/j.jfluchem.2017.08.015] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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14
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Pei L, Dong K, Tang Y, Zhang B, Yu C, Li W. A density functional theory study of the decomposition mechanism of nitroglycerin. J Mol Model 2017; 23:269. [PMID: 28828550 DOI: 10.1007/s00894-017-3440-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2017] [Accepted: 08/07/2017] [Indexed: 11/30/2022]
Abstract
The detailed decomposition mechanism of nitroglycerin (NG) in the gas phase was studied by examining reaction pathways using density functional theory (DFT) and canonical variational transition state theory combined with a small-curvature tunneling correction (CVT/SCT). The mechanism of NG autocatalytic decomposition was investigated at the B3LYP/6-31G(d,p) level of theory. Five possible decomposition pathways involving NG were identified and the rate constants for the pathways at temperatures ranging from 200 to 1000 K were calculated using CVT/SCT. There was found to be a lower energy barrier to the β-H abstraction reaction than to the α-H abstraction reaction during the initial step in the autocatalytic decomposition of NG. The decomposition pathways for CHOCOCHONO2 (a product obtained following the abstraction of three H atoms from NG by NO2) include O-NO2 cleavage or isomer production, meaning that the autocatalytic decomposition of NG has two reaction pathways, both of which are exothermic. The rate constants for these two reaction pathways are greater than the rate constants for the three pathways corresponding to unimolecular NG decomposition. The overall process of NG decomposition can be divided into two stages based on the NO2 concentration, which affects the decomposition products and reactions. In the first stage, the reaction pathway corresponding to O-NO2 cleavage is the main pathway, but the rates of the two autocatalytic decomposition pathways increase with increasing NO2 concentration. However, when a threshold NO2 concentration is reached, the NG decomposition process enters its second stage, with the two pathways for NG autocatalytic decomposition becoming the main and secondary reaction pathways.
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Affiliation(s)
- Liguan Pei
- Department of Aircraft Engineering, Naval Aeronautical Engineering University, No. 188, Erma Road, Zhifu District, Yantai City, Shandong Province, 264001, China.
| | - Kehai Dong
- Department of Aircraft Engineering, Naval Aeronautical Engineering University, No. 188, Erma Road, Zhifu District, Yantai City, Shandong Province, 264001, China
| | - Yanhui Tang
- Department of Aircraft Engineering, Naval Aeronautical Engineering University, No. 188, Erma Road, Zhifu District, Yantai City, Shandong Province, 264001, China
| | - Bo Zhang
- Department of Aircraft Engineering, Naval Aeronautical Engineering University, No. 188, Erma Road, Zhifu District, Yantai City, Shandong Province, 264001, China
| | - Chang Yu
- Department of Aircraft Engineering, Naval Aeronautical Engineering University, No. 188, Erma Road, Zhifu District, Yantai City, Shandong Province, 264001, China
| | - Wenzuo Li
- College of Chemistry and Chemical Engineering, Yantai University, Yantai, 264005, China
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15
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Night-time reaction of 2-chloroethyl methyl ether (CH 3 OCH 2 CH 2 Cl) initiated by NO 3 radical: A theoretical insight. COMPUT THEOR CHEM 2017. [DOI: 10.1016/j.comptc.2017.03.042] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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16
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Sarma PJ, Gour NK, Bhattacharjee D, Mishra BK, Deka RC. Hydrogen atom abstraction from Piperazine by hydroxyl radical: a theoretical investigation. Mol Phys 2017. [DOI: 10.1080/00268976.2017.1294714] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
| | - Nand Kishor Gour
- Department of Chemical Sciences, Tezpur University, Tezpur, India
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17
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Hickson KM, Loison JC, Nuñez-Reyes D, Méreau R. Quantum Tunneling Enhancement of the C + H2O and C + D2O Reactions at Low Temperature. J Phys Chem Lett 2016; 7:3641-3646. [PMID: 27574866 DOI: 10.1021/acs.jpclett.6b01637] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Recent studies of neutral gas-phase reactions characterized by barriers show that certain complex forming processes involving light atoms are enhanced by quantum mechanical tunneling at low temperature. Here, we performed kinetic experiments on the activated C((3)P) + H2O reaction, observing a surprising reactivity increase below 100 K, an effect that is only partially reproduced when water is replaced by its deuterated analogue. Product measurements of H- and D-atom formation allowed us to quantify the contribution of complex stabilization to the total rate while confirming the lower tunneling efficiency of deuterium. This result, which is validated through statistical calculations of the intermediate complexes and transition states has important consequences for simulated interstellar water abundances and suggests that tunneling mechanisms could be ubiquitous in cold dense clouds.
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Affiliation(s)
- Kevin M Hickson
- University Bordeaux, ISM, CNRS UMR 5255, F-33400 Talence, France
| | | | | | - Raphaël Méreau
- University Bordeaux, ISM, CNRS UMR 5255, F-33400 Talence, France
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18
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Carboni M, Marrani AG, Spezia R, Brutti S. 1,2-Dimethoxyethane Degradation Thermodynamics in Li−O2
Redox Environments. Chemistry 2016; 22:17188-17203. [DOI: 10.1002/chem.201602375] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Indexed: 11/12/2022]
Affiliation(s)
- Marco Carboni
- Dipartimento di Chimica; Sapienza Università di Roma; P.le Aldo Moro 5 00185 Roma Italia
| | - Andrea Giacomo Marrani
- Dipartimento di Chimica; Sapienza Università di Roma; P.le Aldo Moro 5 00185 Roma Italia
| | - Riccardo Spezia
- LAMBE, CEA, CNRS; Université Paris Saclay; 91025 Evry France
- LAMBE; Université d'Evry; Bvd. F.Mitterrand 91025 Evry France
| | - Sergio Brutti
- CNR-ISC, U.O.S. Sapienza; Piazzale A. Moro 5 00185 Roma Italia
- Dipartimento di Scienze; Università della Basilicata; V.le Ateneo Lucano 10 85100 Potenza Italia
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