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Delgado Gómez M, Marazzi M, Elguero J, Ferrer M, Alkorta I. Production of Dihydrogen Using Ammonia Borane as Reagent and Pyrazole as Catalyst. Chemphyschem 2023; 24:e202300214. [PMID: 37350535 DOI: 10.1002/cphc.202300214] [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: 03/26/2023] [Revised: 06/14/2023] [Accepted: 06/23/2023] [Indexed: 06/24/2023]
Abstract
Theoretical chemistry (DLPNO-CCSD(T)/def2-TZVP//M06-2x/aug-cc-pVDZ) was used to design a system based on ammonia boranes catalyzed by pyrazoles with the aim of producing dihydrogen, nowadays of high interest as clean fuel. The reactivity of ammonia borane and cyclotriborazane were investigated, including catalytic activation through 1H-pyrazole, 4-methoxy-1H-pyrazole, and 4-nitro-1H-pyrazole. The results point toward a catalytic cycle by which, at the same time, ammonia borane can initially store and then, through catalysis, produce dihydrogen and amino borane. Subsequently, amino borane can trimerize to form cyclotriborazane that, in presence of the same catalyst, can also produce dihydrogen. This study proposes therefore a consistent progress in using environmentally sustainable (metal free) catalysts to efficiently extract dihydrogen from small B-N bonded molecules.
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Affiliation(s)
- Marta Delgado Gómez
- Universidad de Alcalá, Departamento de Química Analítica, Química Física e Ingeniería Química, Ctra. Madrid-Barcelona, Km 33,600, 28871 Alcalá de Henares, Madrid, Spain
| | - Marco Marazzi
- Universidad de Alcalá, Departamento de Química Analítica, Química Física e Ingeniería Química, Ctra. Madrid-Barcelona, Km 33,600, 28871 Alcalá de Henares, Madrid, Spain
- Universidad de Alcalá, Instituto de Investigación Química "Andrés M. del Río" (IQAR), 28871 Alcalá de Henares, Madrid, Spain
| | - José Elguero
- Instituto de Química Médica CSIC, Juan de la Cierva, 3, 28006, Madrid, Spain
| | - Maxime Ferrer
- Instituto de Química Médica CSIC, Juan de la Cierva, 3, 28006, Madrid, Spain
- PhD Program in Theoretical Chemistry and Computational Modeling, Doctoral School, Universidad Autónoma de Madrid, 28049, Madrid, Spain
| | - Ibon Alkorta
- Instituto de Química Médica CSIC, Juan de la Cierva, 3, 28006, Madrid, Spain
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Ghosh A, Banerjee S, Debnath T, Das AK. Dehydrogenation of ammonia-borane to functionalize neutral and Li +-encapsulated C 60, C 70 and C 36 fullerene cages: a DFT approach. Phys Chem Chem Phys 2022; 24:4022-4041. [PMID: 35103266 DOI: 10.1039/d1cp05770g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Mechanistic investigations into the functionalization of three fullerene cages, viz. C60, C70, and C36 through dehydrogenation of ammonia-borane (AB) have been conducted using Density Functional Theory (DFT). In this process of functionalization, different ring fusions, namely (6-6), (6-5) positions for C60 and C70, and an additional (5-5) for C36 fullerene have been investigated. The optimized geometries of all the complexes and transition states have been characterized using the M06-2X functional in conjunction with the 6-31G(d) basis set. The effect of Li+-encapsulation on the energetics and activation barriers of H2 attachment has also been examined. Although the process of functionalization of neutral fullerenes proceeds extensively through concerted pathways, a step-wise route has been observed for the encapsulated systems. NPA charge analysis and Wiberg bond index (WBI) have been used in order to detect the change in the nature of participating hydrogen atoms and validate the variation in the bond order of the C-C connectivity respectively upon hydrogenation. GCRD parameters have also been calculated to explicate the electronic properties of the hydrogenated products. The (6-6) hydrogenation is observed to be favoured thermodynamically and kinetically for both neutral and Li+-encapsulated C60 and C70, while (5-5) is found to be the most preferred site for C36 systems. Our theoretical exploration suggests that the covalent functionalization of the fullerene cages can be done successfully viaAB resulting in the stabilization of these systems. In short, the present work will provide a general idea about the detailed mechanism related to the functionalization of fullerene cages, which will further motivate researchers in fullerene chemistry.
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Affiliation(s)
- Avik Ghosh
- School of Mathematical & Computational Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India.
| | - Soumadip Banerjee
- School of Mathematical & Computational Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India.
| | - Tanay Debnath
- School of Mathematical & Computational Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India.
| | - Abhijit K Das
- School of Mathematical & Computational Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India.
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Ghosh A, Debnath T, Ash T, Banerjee S, Das AK. Ru‐Catalyzed Cross Dehydrogenative Coupling Leading to Si−O and Si−S Bond Formations and Also Stimulating an Alternative Scope for Hydrogenation of C=O, C=N and N=N Bonds. ChemistrySelect 2020. [DOI: 10.1002/slct.202003968] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Avik Ghosh
- School of Mathematical & Computational Sciences Indian Association for the Cultivation of Science Jadavpur Kolkata 700032 India
| | - Tanay Debnath
- School of Mathematical & Computational Sciences Indian Association for the Cultivation of Science Jadavpur Kolkata 700032 India
| | - Tamalika Ash
- School of Mathematical & Computational Sciences Indian Association for the Cultivation of Science Jadavpur Kolkata 700032 India
| | - Soumadip Banerjee
- School of Mathematical & Computational Sciences Indian Association for the Cultivation of Science Jadavpur Kolkata 700032 India
| | - Abhijit K. Das
- School of Mathematical & Computational Sciences Indian Association for the Cultivation of Science Jadavpur Kolkata 700032 India
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