1
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Marsili E, Curchod BFE. A Theoretical Perspective on the Photochemistry of Boron-Nitrogen Lewis Adducts. J Phys Chem A 2024; 128:996-1008. [PMID: 38236050 PMCID: PMC10875676 DOI: 10.1021/acs.jpca.3c07016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Revised: 01/02/2024] [Accepted: 01/04/2024] [Indexed: 01/19/2024]
Abstract
Boron-Nitrogen (B-N) Lewis adducts form a versatile family of compounds with numerous applications in functional molecules. Despite the growing interest in this family of compounds for optoelectronic applications, little is currently known about their photophysics and photochemistry. Even the electronic absorption spectrum of ammonia borane, the textbook example of a B-N Lewis adduct, is unavailable. Given the versatility of the light-induced processes exhibited by these molecules, we propose in this work a detailed theoretical study of the photochemistry and photophysics of simple B-N Lewis adducts. We used advanced techniques in computational photochemistry to identify and characterize the possible photochemical pathways followed by ammonia borane and extended this knowledge to the substituted B-N Lewis adducts pyridine-borane and pyridine-boric acid. The photochemistry observed for this series of molecules allows us to extract qualitative rules to rationalize the light-induced behavior of more complex B-N-containing molecules.
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Affiliation(s)
- Emanuele Marsili
- Centre for Computational Chemistry,
School of Chemistry, University of Bristol, Bristol BS8 1TS, U.K.
| | - Basile F. E. Curchod
- Centre for Computational Chemistry,
School of Chemistry, University of Bristol, Bristol BS8 1TS, U.K.
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2
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Cross MJ, Brodie CN, Crivoi DG, Goodall JC, Ryan DE, Martínez‐Martínez AJ, Johnson A, Weller AS. Dehydropolymerization of Amine-Boranes using Bis(imino)pyridine Rhodium Pre-Catalysis: σ-Amine-Borane Complexes, Nanoparticles, and Low Residual-Metal BN-Polymers that can be Chemically Repurposed. Chemistry 2023; 29:e202302110. [PMID: 37530441 PMCID: PMC10947130 DOI: 10.1002/chem.202302110] [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: 07/03/2023] [Revised: 07/31/2023] [Accepted: 08/02/2023] [Indexed: 08/03/2023]
Abstract
The sigma amine-borane complexes [Rh(L1)(η2 :η2 -H3 B⋅NRH2 )][OTf] (L1=2,6-bis-[1-(2,6-diisopropylphenylimino)ethyl]pyridine, R=Me, Et, n Pr) are described, alongside [Rh(L1)(NMeH2 )][OTf]. Using R=Me as a pre-catalyst (1 mol %) the dehydropolymerization of H3 B ⋅ NMeH2 gives [H2 BNMeH]n selectively. Added NMeH2 , or the direct use of [Rh(L1)(NMeH2 )][OTf], is required for initiation of catalysis, which is suggested to operate through the formation of a neutral hydride complex, Rh(L1)H. The formation of small (1-5 nm) nanoparticles is observed at the end of catalysis, but studies are ambiguous as to whether the catalysis is solely nanoparticle promoted or if there is a molecular homogeneous component. [Rh(L1)(NMeH2 )][OTf] is shown to operate at 0.025 mol % loadings on a 2 g scale of H3 B ⋅ NMeH2 to give polyaminoborane [H2 BNMeH]n [Mn =30,900 g/mol, Ð=1.8] that can be purified to a low residual [Rh] (6 μg/g). Addition of Na[N(SiMe3 )2 ] to [H2 BNMeH]n results in selective depolymerization to form the eee-isomer of N,N,N-trimethylcyclotriborazane [H2 BNMeH]3 : the chemical repurposing of a main-group polymer.
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Affiliation(s)
| | | | - Dana G. Crivoi
- Department of ChemistryUniversity of OxfordOxfordOX1 3TAUK
| | | | - David E. Ryan
- Department of ChemistryUniversity of YorkYorkYO10 5DDUK
- Department of ChemistryUniversity of OxfordOxfordOX1 3TAUK
| | - Antonio J. Martínez‐Martínez
- Department of ChemistryUniversity of OxfordOxfordOX1 3TAUK
- Supramolecular Organometallic and Main Group Chemistry Laboratory CIQSO-Center for Research in Sustainable Chemistry and Department of ChemistryUniversity of HuelvaCampus El Carmen21007HuelvaSpain
| | - Alice Johnson
- Department of ChemistryUniversity of OxfordOxfordOX1 3TAUK
- Department of Biosciences and ChemistrySheffield Hallam UniversityHoward StSheffieldS1 1WBUK
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3
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Ki Au Y, Ma Q, Zhang J, Xie Z. Ir-Catalyzed B(3)-Amination of o-Carboranes with Amines via Acceptorless Dehydrogenative BH/NH Cross-Coupling. Chem Asian J 2023; 18:e202300611. [PMID: 37694997 DOI: 10.1002/asia.202300611] [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: 07/14/2023] [Revised: 09/09/2023] [Accepted: 09/11/2023] [Indexed: 09/12/2023]
Abstract
An efficient and convenient strategy for Ir-catalyzed selective B(3)-amination of o-carboranes with amines via acceptorless BH/NH dehydrocoupling was developed, affording a series of B(3)-aminated-o-carboranes in moderate to high isolated yields with H2 gas as a sole by-product. Such an oxidant-free system endues the protocol sustainability, atom-economy and environmental friendliness. A reaction mechanism via an Ir(I)-Ir(III)-Ir(I) catalytic cycle involving oxidative addition, dehydrogenation and reductive elimination was proposed.
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Affiliation(s)
- Yik Ki Au
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong Shatin, N.T., Hong Kong, P.R. China
| | - Qiangqiang Ma
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong Shatin, N.T., Hong Kong, P.R. China
| | - Jie Zhang
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong Shatin, N.T., Hong Kong, P.R. China
| | - Zuowei Xie
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong Shatin, N.T., Hong Kong, P.R. China
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055, P.R.China
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4
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Markham GD, Rostami H, Larkin JD, Bock CW. Models for boronic acid receptors II: a computational structural, bonding, and thermochemical investigation of the RB(OH)2∙H2O∙NH3 and RB(−OCH2CH2O−)∙NH3∙H2O potential energy surfaces (R = H, methyl, phenyl, and ortho-methyl-phenyl). Struct Chem 2023. [DOI: 10.1007/s11224-023-02131-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
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5
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The reciprocal SN2 and SE2 reactions of ammonia borane. Chem Phys Lett 2022. [DOI: 10.1016/j.cplett.2022.140051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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6
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Brodie CN, Sotorrios L, Boyd TM, Macgregor SA, Weller AS. Dehydropolymerization of H 3B·NMeH 2 Mediated by Cationic Iridium(III) Precatalysts Bearing κ 3- iPr-PN RP Pincer Ligands ( R = H, Me): An Unexpected Inner-Sphere Mechanism. ACS Catal 2022; 12:13050-13064. [PMID: 36313521 PMCID: PMC9594342 DOI: 10.1021/acscatal.2c03778] [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: 08/01/2022] [Revised: 09/27/2022] [Indexed: 11/30/2022]
Abstract
![]()
The dehydropolymerization of H3B·NMeH2 to form N-methylpolyaminoborane using neutral
and
cationic catalysts based on the {Ir(iPr-PNHP)} fragment [iPr-PNHP = κ3-(CH2CH2PiPr2)2NH] is reported. Neutral
Ir(iPr-PNHP)H3 or
Ir(iPr-PNHP)H2Cl
precatalysts show no, or poor and unselective, activity respectively
at 298 K in 1,2-F2C6H4 solution.
In contrast, addition of [NMeH3][BArF4] (ArF = 3,5-(CF3)2C6H3) to Ir(iPr-PNHP)H3 immediately starts catalysis, suggesting that a cationic
catalytic manifold operates. Consistent with this, independently synthesized
cationic precatalysts are active (tested between 0.5 and 2.0 mol %
loading) producing poly(N-methylaminoborane) with Mn ∼ 40,000 g/mol, Đ ∼1.5, i.e., dihydrogen/dihydride, [Ir(iPr-PNHP)(H)2(H2)][BArF4]; σ-amine-borane [Ir(iPr-PNHP)(H)2(H3B·NMe3)][BArF4]; and [Ir(iPr-PNHP)(H)2(NMeH2)][BArF4]. Density functional theory (DFT) calculations
probe hydride exchange processes in two of these complexes and also
show that the barrier to amine-borane dehydrogenation is lower (22.5
kcal/mol) for the cationic system compared with the neutral system
(24.3 kcal/mol). The calculations show that the dehydrogenation proceeds
via an inner-sphere process without metal–ligand cooperativity,
and this is supported experimentally by N–Me substituted [Ir(iPr-PNMeP)(H)2(H3B·NMe3)][BArF4] being
an active catalyst. Key to the lower barrier calculated for the cationic
system is the outer-sphere coordination of an additional H3B·NMeH2 with the N–H group of the ligand.
Experimentally, kinetic studies indicate a complex reaction manifold
that shows pronounced deceleratory temporal profiles. As supported
by speciation and DFT studies, a key observation is that deprotonation
of [Ir(iPr-NHP)(H)2(H2)][BArF4], formed upon amine-borane
dehydrogenation, by the slow in situ formation of NMeH2 (via B–N bond cleavage), results in the formation of essentially
inactive Ir(iPr-PNHP)H3, with a coproduct of [NMeH3]+/[H2B(NMeH2)2]+. While reprotonation
of Ir(iPr-PNHP)H3 results in a return to the cationic cycle, it is proposed, supported
by doping experiments, that reprotonation is attenuated by entrainment
of the [NMeH3]+/[H2B(NMeH2)2]+/catalyst in insoluble polyaminoborane.
The role of [NMeH3]+/[H2B(NMeH2)]+ as chain control agents is also noted.
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Affiliation(s)
| | - Lia Sotorrios
- Institute of Chemical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, U.K
| | - Timothy M. Boyd
- Department of Chemistry, University of York, York YO10 5DD, U.K
- Chemistry Research Laboratories, University of Oxford, Oxford OX1 3TA, U.K
| | - Stuart A. Macgregor
- Institute of Chemical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, U.K
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7
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Volodarsky S, Bawari D, Dobrovetsky R. Dual Reactivity of a Geometrically Constrained Phosphenium Cation. Angew Chem Int Ed Engl 2022; 61:e202208401. [PMID: 35830679 PMCID: PMC9541694 DOI: 10.1002/anie.202208401] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Indexed: 01/08/2023]
Abstract
A geometrically constrained phosphenium cation in bis(pyrrolyl)pyridine based NNN pincer type ligand (1+) was synthesized, isolated and its preliminary reactivity was studied with small molecules. 1+ reacts with MeOH and Et2NH, activating the O−H and N−H bonds via a P‐center/ligand assisted path. The reaction of 1+ with one equiv. of H3NBH3 leads to its dehydrogenation producing 5. Interestingly, reaction of 1+ with an excess H3NBH3 leads to phosphinidene (PI) species coordinating to two BH3 molecules (6). In contrast, [1+][OTf] reacts with Et3SiH by hydride abstraction yielding 1‐H and Et3SiOTf, while [1+][B(C6F5)4] reacts with Et3SiH via an oxidative addition type reaction of Si−H bond to P‐center, affording a new PV compound (8). However, 8 is not stable over time and degrades to a complex mixture of compounds in matter of minutes. Despite this, the ability of [1+][B(C6F5)4] to activate Si−H bond could still be tested in catalytic hydrosilylation of benzaldehyde, where 1+ closely mimics transition metal behaviour.
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Affiliation(s)
- Solomon Volodarsky
- School of Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences Tel Aviv University Department Tel Aviv 69978 Israel
| | - Deependra Bawari
- School of Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences Tel Aviv University Department Tel Aviv 69978 Israel
| | - Roman Dobrovetsky
- School of Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences Tel Aviv University Department Tel Aviv 69978 Israel
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8
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Volodarsky S, Bawari D, Dobrovetsky R. Dual Reactivity of a Geometrically Constrained Phosphenium Cation. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202208401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
| | | | - Roman Dobrovetsky
- Tel Aviv University School of Chemistry Tel Aviv University, Shenkar Chemistry building, room 105 69978 Tel Aviv ISRAEL
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9
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Zhdanko A, van der Worp BA, Lemaire S. Coordination Chemistry of Borane in Solution: Application to a STING Agonist. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Alexander Zhdanko
- Janssen Pharmaceutica NV Chemical process R&D Turnhoutseweg 30 2340 Beerse BELGIUM
| | - Boris A. van der Worp
- Lomonosov Moscow State University: Moskovskij gosudarstvennyj universitet imeni M V Lomonosova chemistry department Leninskie Gory 1-3 119991 Moscow RUSSIAN FEDERATION
| | - Sébastien Lemaire
- Janssen Research and Development Beerse Chemical Development - Process Research Turnhoutseweg 30 2340 Beerse BELGIUM
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10
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Ma N, Xu Q, Zhang G. Theoretical insights on boron reducing agent for the reduction of carbonyl compounds. Phys Chem Chem Phys 2021; 23:19111-19119. [PMID: 34524286 DOI: 10.1039/d1cp01857d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this perspective, we present computational progress in the reduction of carbonyl compounds using boron reducing agents, such as L·BH3, HBcat, HBpin, and 9-BBN. For the catalytic reduction reactions, establishing a catalytic mechanism will provide an important theoretical basis for the improvement of a more efficient combination of reducing agents and catalysts. Current computational studies reveal that the mechanisms of reactions are different due to the various combinations of electrophilic boron reducing agents and catalysts (transition-metal catalyst, main group metal catalysts, and metal-free frustrated Lewis pair). We discuss the role of boron reducing agents on the efficiency of reactions and believe that possible Lewis acid-base interaction between Bδ+, Mδ+ and Oδ-, Hδ- existing in boron reducing agent, unsaturated substances, and catalyst should be considered fully. A tentative outlook on future opportunities of this research field is proposed.
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Affiliation(s)
- Nana Ma
- School of Chemistry and Chemical Engineering, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, NMPA Key Laboratory for Research and Evaluation of Innovative Drug, Henan Normal University, Xinxiang, Henan, 453007, China.
| | - Qingli Xu
- School of Chemistry and Chemical Engineering, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, NMPA Key Laboratory for Research and Evaluation of Innovative Drug, Henan Normal University, Xinxiang, Henan, 453007, China.
| | - Guisheng Zhang
- School of Chemistry and Chemical Engineering, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, NMPA Key Laboratory for Research and Evaluation of Innovative Drug, Henan Normal University, Xinxiang, Henan, 453007, China.
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11
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Ramachandran PV, Hamann HJ. Ammonia-borane as a Catalyst for the Direct Amidation of Carboxylic Acids. Org Lett 2021; 23:2938-2942. [PMID: 33826344 DOI: 10.1021/acs.orglett.1c00591] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Ammonia-borane serves as an efficient substoichiometric (10%) precatalyst for the direct amidation of both aromatic and aliphatic carboxylic acids. In situ generation of amine-boranes precedes the amidation and, unlike the amidation with stoichiometric amine-boranes, this process is facile with 1 equiv of the acid. This methodology has high functional group tolerance and chromatography-free purification but is not amenable for esterification. The latter feature has been exploited to prepare hydroxyl- and thiol-containing amides.
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Affiliation(s)
- P Veeraraghavan Ramachandran
- Herbert C. Brown Center for Borane Research, Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
| | - Henry J Hamann
- Herbert C. Brown Center for Borane Research, Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
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12
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Au YK, Zhang J, Quan Y, Xie Z. Ir-Catalyzed Selective B(3)-H Amination of o-Carboranes with NH3. J Am Chem Soc 2021; 143:4148-4153. [DOI: 10.1021/jacs.1c00593] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Yik Ki Au
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong, China
| | - Jie Zhang
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong, China
| | - Yangjian Quan
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong, China
| | - Zuowei Xie
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong, China
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13
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Li H, Li Y, Kang J, Fan L, Yang Q, Li S, Rahman A, Chen D. Reactivity and mechanisms of hydridic hydrogen of B–H in ammonia borane towards acetic acids: the ammonia B-monoacyloxy boranes. NEW J CHEM 2021. [DOI: 10.1039/d1nj01727f] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
B-monoacyloxy boranes are first obtained by moderate reactions of ammonia borane with acetic acids.
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Affiliation(s)
- Huizhen Li
- School of Chemistry and Chemical Engineering
- Guangzhou University
- Guangzhou 510006
- P. R. China
- Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials
| | - Yunhui Li
- School of Chemistry and Chemical Engineering
- Guangzhou University
- Guangzhou 510006
- P. R. China
| | - Jiaxin Kang
- Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials
- School of Chemistry and Chemical Engineering
- Henan Normal University
- Xinxiang
- P. R. China
| | - Lin Fan
- Beijing Normal University Publishing Group
- College of Chemistry
- Beijing Normal University
- Beijing 100875
- P. R. China
| | - Qiuyu Yang
- Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials
- School of Chemistry and Chemical Engineering
- Henan Normal University
- Xinxiang
- P. R. China
| | - Shujun Li
- Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials
- School of Chemistry and Chemical Engineering
- Henan Normal University
- Xinxiang
- P. R. China
| | - Abdul Rahman
- School of Chemistry and Chemical Engineering
- Guangzhou University
- Guangzhou 510006
- P. R. China
| | - Daqi Chen
- School of Mechanical and Electrical Engineering
- Guangzhou University
- Guangzhou
- P. R. China
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14
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Spielvogel KD, Luna JA, Loria SM, Weisburn LP, Stumme NC, Ringenberg MR, Durgaprasad G, Keith JM, Shaw SK, Daly SR. Influence of Multisite Metal-Ligand Cooperativity on the Redox Activity of Noninnocent N 2S 2 Ligands. Inorg Chem 2020; 59:10845-10853. [PMID: 32639726 DOI: 10.1021/acs.inorgchem.0c01353] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Metal-ligand cooperativity (MLC) relies on chemically reactive ligands to assist metals with small-molecule binding and activation, and it has facilitated unprecedented examples of catalysis with metal complexes. Despite growing interest in combining ligand-centered chemical and redox reactions for chemical transformations, there are few studies demonstrating how chemically engaging redox active ligands in MLC affects their electrochemical properties when bound to metals. Here we report stepwise changes in the redox activity of model Ru complexes as zero, one, and two BH3 molecules undergo MLC binding with a triaryl noninnocent N2S2 ligand derived from o-phenylenediamine (L1). A similar series of Ru complexes with a diaryl N2S2 ligand with ethylene substituted in place of phenylene (L2) is also described to evaluate the influence of the o-phenylenediamine subunit on redox activity and MLC. Cyclic voltammetry (CV) studies and density functional theory (DFT) calculations show that MLC attenuates ligand-centered redox activity in both series of complexes, but electron transfer is still achieved when only one of the two redox-active sites on the ligands is chemically engaged. The results demonstrate how incorporating more than one multifunctional reactive site could be an effective strategy for maintaining redox noninnocence in ligands that are also chemically reactive and competent for MLC.
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Affiliation(s)
- Kyle D Spielvogel
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242, United States
| | - Javier A Luna
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242, United States
| | - Sydney M Loria
- Department of Chemistry, Colgate University, 13 Oak Drive, Hamilton, New York 13346, United States
| | - Leah P Weisburn
- Department of Chemistry, Colgate University, 13 Oak Drive, Hamilton, New York 13346, United States
| | - Nathan C Stumme
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242, United States
| | - Mark R Ringenberg
- Universität Stuttgart, Institut für Anorganische Chemie, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Gummadi Durgaprasad
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242, United States
| | - Jason M Keith
- Department of Chemistry, Colgate University, 13 Oak Drive, Hamilton, New York 13346, United States
| | - Scott K Shaw
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242, United States
| | - Scott R Daly
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242, United States
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15
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Herrera-España AD, Höpfl H, Morales-Rojas H. Boron-Nitrogen Double Tweezers Comprising Arylboronic Esters and Diamines: Self-Assembly in Solution and Adaptability as Hosts for Aromatic Guests in the Solid State. Chempluschem 2020; 85:548-560. [PMID: 32202393 DOI: 10.1002/cplu.201900717] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2019] [Revised: 12/11/2019] [Indexed: 01/07/2023]
Abstract
The thermodynamic stability of 1 : 1 and 2 : 1 boron-nitrogen (B←N) adducts formed between aromatic boronic esters with mono- and diamines was studied in solution by NMR and UV-vis spectroscopy with association energies (ΔG°) ranging from -11 to -28 kJ mol-1 . The effect of different substituents in the boronic ester, the nature of the diamine linker, and the effect of the solvent was explored. Stable 2 : 1 B←N adducts with diamines such as 1,3-diaminopropane were produced in solutions of hydrogen-bonding acceptor solvents (acetonitrile and ethyl acetate), which can be isolated in the solid state as crystalline solvates, whereas the use of noncoordinating solvents such as 1,2-dichloroethane afforded mainly 1 : 1 B←N adducts. In suitable combinations, aromatic bis-pyridyl diamines produced stable 2 : 1 B←N adducts that were isolated either as solvent-free solids, solvates, or cocrystals. In these crystalline forms, double-tweezer hosts were observed with an exceptional syn/anti conformational guest-adaptability driven by simultaneous donor-acceptor and C-H⋅⋅⋅π interactions in the tweezer cavities, resembling preorganized covalent tweezer hosts. Interestingly, cocrystals with electron-rich guests such as tetrathiafulvalene and pyrene showed non-centrosymmetric crystal lattices with infinite π-stacked donor-acceptor columns.
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Affiliation(s)
- Angel D Herrera-España
- Centro de Investigaciones Químicas Instituto de Investigación en Ciencias Básicas y Aplicadas (IICBA), Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, 62209, Cuernavaca, Morelos, Mexico
| | - Herbert Höpfl
- Centro de Investigaciones Químicas Instituto de Investigación en Ciencias Básicas y Aplicadas (IICBA), Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, 62209, Cuernavaca, Morelos, Mexico
| | - Hugo Morales-Rojas
- Centro de Investigaciones Químicas Instituto de Investigación en Ciencias Básicas y Aplicadas (IICBA), Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, 62209, Cuernavaca, Morelos, Mexico
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16
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Kameo H, Baba Y, Sakaki S, Tanaka Y, Matsuzaka H. Experimental and Theoretical Investigation of an SN2-type Pathway for Borate–Fluorine Bond Cleavage by Electron-Rich Late-Transition Metal Complexes. Inorg Chem 2020; 59:4282-4291. [DOI: 10.1021/acs.inorgchem.9b03053] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hajime Kameo
- Department of Chemistry, Graduate School of Science, Osaka Prefecture University, Gakuen-cho 1-1, Naka-ku, Sakai, Osaka 599-8531, Japan
| | - Yuki Baba
- Department of Chemistry, Graduate School of Science, Osaka Prefecture University, Gakuen-cho 1-1, Naka-ku, Sakai, Osaka 599-8531, Japan
| | - Shigeyoshi Sakaki
- Fukui Institute for Fundamental Chemistry, Kyoto University, Takano-nishihiraki-cho 34-4, Sakyo-ku, Kyoto 606-8103, Japan
| | - Yudai Tanaka
- Department of Chemistry, Graduate School of Science, Osaka Prefecture University, Gakuen-cho 1-1, Naka-ku, Sakai, Osaka 599-8531, Japan
| | - Hiroyuki Matsuzaka
- Department of Chemistry, Graduate School of Science, Osaka Prefecture University, Gakuen-cho 1-1, Naka-ku, Sakai, Osaka 599-8531, Japan
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17
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Shakirova EI, Kuznetsov VV. Effect of Chemical Composition of Fullerenes on the Structure and Internal Rotation Barrier of Encapsulated Ammonia Borane Molecule. RUSS J GEN CHEM+ 2019. [DOI: 10.1134/s1070363219110112] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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18
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Safronov SV, Gutsul EI, Golub IE, Dolgushin FM, Nelubina YV, Filippov OA, Epstein LM, Peregudov AS, Belkova NV, Shubina ES. Synthesis, structural properties and reactivity of ruthenocene-based pincer Pd(ii) tetrahydroborate. Dalton Trans 2019; 48:12720-12729. [DOI: 10.1039/c9dt02176k] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Non-covalent interactions determine the structure, crystal packing and reactivity of isolated ruthenocene-based pincer Pd(ii) complexes. Bifurcate dihydrogen-bonded complexes are active intermediates of tetrahydroborate alcoholysis.
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Affiliation(s)
- Sergey V. Safronov
- A. N. Nesmeyanov Institute of Organoelement Compounds
- Russian Academy of Sciences (INEOS RAS)
- 119991 Moscow
- Russia
| | - Evgenii I. Gutsul
- A. N. Nesmeyanov Institute of Organoelement Compounds
- Russian Academy of Sciences (INEOS RAS)
- 119991 Moscow
- Russia
| | - Igor E. Golub
- A. N. Nesmeyanov Institute of Organoelement Compounds
- Russian Academy of Sciences (INEOS RAS)
- 119991 Moscow
- Russia
| | - Fedor M. Dolgushin
- A. N. Nesmeyanov Institute of Organoelement Compounds
- Russian Academy of Sciences (INEOS RAS)
- 119991 Moscow
- Russia
| | - Yulia V. Nelubina
- A. N. Nesmeyanov Institute of Organoelement Compounds
- Russian Academy of Sciences (INEOS RAS)
- 119991 Moscow
- Russia
| | - Oleg A. Filippov
- A. N. Nesmeyanov Institute of Organoelement Compounds
- Russian Academy of Sciences (INEOS RAS)
- 119991 Moscow
- Russia
| | - Lina M. Epstein
- A. N. Nesmeyanov Institute of Organoelement Compounds
- Russian Academy of Sciences (INEOS RAS)
- 119991 Moscow
- Russia
| | - Alexander S. Peregudov
- A. N. Nesmeyanov Institute of Organoelement Compounds
- Russian Academy of Sciences (INEOS RAS)
- 119991 Moscow
- Russia
| | - Natalia V. Belkova
- A. N. Nesmeyanov Institute of Organoelement Compounds
- Russian Academy of Sciences (INEOS RAS)
- 119991 Moscow
- Russia
| | - Elena S. Shubina
- A. N. Nesmeyanov Institute of Organoelement Compounds
- Russian Academy of Sciences (INEOS RAS)
- 119991 Moscow
- Russia
- Peoples’ Friendship University of Russia (RUDN University)
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19
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Arduengo III AJ, Uchiyama Y, Dixon DA, Vasiliu M. Crystal Structure of Burgess Inner Salts and their Hydrolyzed Ammonium Sulfaminates. Aust J Chem 2019. [DOI: 10.1071/ch19338] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The solid-state structures of the Burgess reagent, and its analogous ethyl ester reveal structures indicative of triethylamine solvated sulfonyl imides rather than the more commonly depicted triethylammonium sulfonyl amidate. The existence of a reversibly formed hydrate of Burgess reagent is not supported by present studies, but rather a hydrosylate that does not revert to the Burgess reagent with gentle warming under vacuum was isolated and characterised. Structures of the hydrosylates from both the methyl- and ethyl-amidate esters were determined from X-ray crystallographic analysis and are reported. The crystal structures of the Burgess inner salts exhibit geometries at the sulfur atoms that are intermediate between a planar O2S=NCO2R unit and tetrahedral 4-coordinate sulfur centres that would be expected from a strong single (dative) bond between the triethylamine nitrogen and sulfur. The hydrolysed ammonium sulfaminates are water soluble intermolecular salts composed of triethylammonium ions, Et3NH+, and N-(alkoxycarbonyl)sulfaminate, O(−)SO2NHCO2R {R=CH3 or C2H5}.
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20
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Ledoux A, Larini P, Boisson C, Monteil V, Raynaud J, Lacôte E. Polyboramines for Hydrogen Release: Polymers Containing Lewis Pairs in their Backbone. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201508395] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Audrey Ledoux
- Université de Lyon, Institut de Chimie de Lyon, C2P2, UMR 5265 CNRS‐CPE Lyon‐UCBL, 43 Bd du 11 Novembre 1918, 69616 Villeurbanne (France) http://c2p2‐cpe.com/index.php
| | - Paolo Larini
- Université de Lyon, Institut de Chimie de Lyon, ICBMS, UMR 5246 CNRS‐CPE Lyon‐UCBL, 43 Bd du 11 Novembre 1918, 69616 Villeurbanne (France)
| | - Christophe Boisson
- Université de Lyon, Institut de Chimie de Lyon, C2P2, UMR 5265 CNRS‐CPE Lyon‐UCBL, 43 Bd du 11 Novembre 1918, 69616 Villeurbanne (France) http://c2p2‐cpe.com/index.php
| | - Vincent Monteil
- Université de Lyon, Institut de Chimie de Lyon, C2P2, UMR 5265 CNRS‐CPE Lyon‐UCBL, 43 Bd du 11 Novembre 1918, 69616 Villeurbanne (France) http://c2p2‐cpe.com/index.php
| | - Jean Raynaud
- Université de Lyon, Institut de Chimie de Lyon, C2P2, UMR 5265 CNRS‐CPE Lyon‐UCBL, 43 Bd du 11 Novembre 1918, 69616 Villeurbanne (France) http://c2p2‐cpe.com/index.php
| | - Emmanuel Lacôte
- Université de Lyon, Institut de Chimie de Lyon, C2P2, UMR 5265 CNRS‐CPE Lyon‐UCBL, 43 Bd du 11 Novembre 1918, 69616 Villeurbanne (France) http://c2p2‐cpe.com/index.php
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21
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Ledoux A, Larini P, Boisson C, Monteil V, Raynaud J, Lacôte E. Polyboramines for Hydrogen Release: Polymers Containing Lewis Pairs in their Backbone. Angew Chem Int Ed Engl 2015; 54:15744-9. [DOI: 10.1002/anie.201508395] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2015] [Revised: 10/20/2015] [Indexed: 11/06/2022]
Affiliation(s)
- Audrey Ledoux
- Université de Lyon, Institut de Chimie de Lyon, C2P2, UMR 5265 CNRS‐CPE Lyon‐UCBL, 43 Bd du 11 Novembre 1918, 69616 Villeurbanne (France) http://c2p2‐cpe.com/index.php
| | - Paolo Larini
- Université de Lyon, Institut de Chimie de Lyon, ICBMS, UMR 5246 CNRS‐CPE Lyon‐UCBL, 43 Bd du 11 Novembre 1918, 69616 Villeurbanne (France)
| | - Christophe Boisson
- Université de Lyon, Institut de Chimie de Lyon, C2P2, UMR 5265 CNRS‐CPE Lyon‐UCBL, 43 Bd du 11 Novembre 1918, 69616 Villeurbanne (France) http://c2p2‐cpe.com/index.php
| | - Vincent Monteil
- Université de Lyon, Institut de Chimie de Lyon, C2P2, UMR 5265 CNRS‐CPE Lyon‐UCBL, 43 Bd du 11 Novembre 1918, 69616 Villeurbanne (France) http://c2p2‐cpe.com/index.php
| | - Jean Raynaud
- Université de Lyon, Institut de Chimie de Lyon, C2P2, UMR 5265 CNRS‐CPE Lyon‐UCBL, 43 Bd du 11 Novembre 1918, 69616 Villeurbanne (France) http://c2p2‐cpe.com/index.php
| | - Emmanuel Lacôte
- Université de Lyon, Institut de Chimie de Lyon, C2P2, UMR 5265 CNRS‐CPE Lyon‐UCBL, 43 Bd du 11 Novembre 1918, 69616 Villeurbanne (France) http://c2p2‐cpe.com/index.php
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22
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Ramachandran PV, Kulkarni AS. Open-Flask Synthesis of Amine–Boranes via Tandem Amine–Ammonium Salt Equilibration–Metathesis. Inorg Chem 2015; 54:5618-20. [DOI: 10.1021/acs.inorgchem.5b00572] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- P. Veeraraghavan Ramachandran
- Herbert C. Brown Center for Borane
Research, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907-2084, United States
| | - Ameya S. Kulkarni
- Herbert C. Brown Center for Borane
Research, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907-2084, United States
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23
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Golub IE, Gulyaeva ES, Filippov OA, Dyadchenko VP, Belkova NV, Epstein LM, Arkhipov DE, Shubina ES. Dihydrogen bond intermediated alcoholysis of dimethylamine-borane in nonaqueous media. J Phys Chem A 2015; 119:3853-68. [PMID: 25822484 DOI: 10.1021/acs.jpca.5b01921] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Dimethylamine-borane (DMAB) acid/base properties, its dihydrogen-bonded (DHB) complexes and proton transfer reaction in nonaqueous media were investigated both experimentally (IR, UV/vis, NMR, and X-ray) and theoretically (DFT, NBO, QTAIM, and NCI). The effects of DMAB concentration, solvents polarity and temperature on the degree of DMAB self-association are shown and the enthalpy of association is determined experimentally for the first time (-ΔH°assoc = 1.5-2.3 kcal/mol). The first case of "improper" (blue-shifting) NH···F hydrogen bonds was observed in fluorobenzene and perfluorobenzene solutions. It was shown that hydrogen-bonded complexes are the intermediates of proton transfer from alcohols and phenols to DMAB. The reaction mechanism was examined computationally taking into account the coordinating properties of the reaction media. The values of the rate constants of proton transfer from HFIP to DMAB in acetone were determined experimentally [(7.9 ± 0.1) × 10(-4) to (1.6 ± 0.1) × 10(-3) mol(-1)·s(-1)] at 270-310 K. Computed activation barrier of this reaction ΔG(‡theor)298 K(acetone) = 23.8 kcal/mol is in good agreement with the experimental value of the activation free energy ΔG(‡exp)270 K = 21.1 kcal/mol.
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Affiliation(s)
- Igor E Golub
- †A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova 28, 119991 Moscow, Russia.,‡Department of Chemistry, M.V. Lomonosov Moscow State University, Leninskie Gory 1/3, 119234 Moscow, Russia
| | - Ekaterina S Gulyaeva
- †A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova 28, 119991 Moscow, Russia.,‡Department of Chemistry, M.V. Lomonosov Moscow State University, Leninskie Gory 1/3, 119234 Moscow, Russia
| | - Oleg A Filippov
- †A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova 28, 119991 Moscow, Russia
| | - Victor P Dyadchenko
- ‡Department of Chemistry, M.V. Lomonosov Moscow State University, Leninskie Gory 1/3, 119234 Moscow, Russia
| | - Natalia V Belkova
- †A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova 28, 119991 Moscow, Russia
| | - Lina M Epstein
- †A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova 28, 119991 Moscow, Russia
| | - Dmitry E Arkhipov
- †A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova 28, 119991 Moscow, Russia
| | - Elena S Shubina
- †A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova 28, 119991 Moscow, Russia
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24
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Légaré MA, Bélanger-Chabot G, De Robillard G, Languérand A, Maron L, Fontaine FG. Insights into the Formation of Borabenzene Adducts via Ligand Exchange Reactions and TMSCl Elimination from Boracyclohexadiene Precursors. Organometallics 2014. [DOI: 10.1021/om500524j] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Marc-André Légaré
- Département
de Chimie, Centre de Catalyse et de Chimie Verte (C3V), Université Laval, 1045 Avenue de la Médecine, Québec (Québec), Canada G1V 0A6
| | - Guillaume Bélanger-Chabot
- Département
de Chimie, Centre de Catalyse et de Chimie Verte (C3V), Université Laval, 1045 Avenue de la Médecine, Québec (Québec), Canada G1V 0A6
| | - Guillaume De Robillard
- Département
de Chimie, Centre de Catalyse et de Chimie Verte (C3V), Université Laval, 1045 Avenue de la Médecine, Québec (Québec), Canada G1V 0A6
| | - André Languérand
- Département
de Chimie, Centre de Catalyse et de Chimie Verte (C3V), Université Laval, 1045 Avenue de la Médecine, Québec (Québec), Canada G1V 0A6
| | - Laurent Maron
- Université de Toulouse, INSA, UPS, LCPNO, CNRS, UMR 5215 CNRS-UPS-INSA, 135 avenue de Rangueil, Toulouse, France
| | - Frédéric-Georges Fontaine
- Département
de Chimie, Centre de Catalyse et de Chimie Verte (C3V), Université Laval, 1045 Avenue de la Médecine, Québec (Québec), Canada G1V 0A6
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25
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Summerscales OT, Gordon JC. Regeneration of ammonia borane from spent fuel materials. Dalton Trans 2014; 42:10075-84. [PMID: 23571860 DOI: 10.1039/c3dt50475a] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A shift to the hydrogen economy requires the development of an effective hydrogen fuel carrier with high volumetric and gravimetric storage capacity. Ammonia borane (AB) has emerged as a leading candidate due to its light weight and multiple protic (N-H) and hydridic (B-H) hydrogens. As a consequence, much work has been directed towards fine tuning the release of H2 from AB, in addition to its regeneration from the dehydrogenated "spent fuel" materials. This review summarizes the development of these regeneration methodologies.
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Affiliation(s)
- Owen T Summerscales
- Chemistry Division, MS J582, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
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26
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27
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Veeraraghavan Ramachandran P, Kulkarni AS. Nucleophilic displacement of ammonia from ammonia borane for the preparation of alkylamine-, pyridine- and phosphine-boranes. RSC Adv 2014. [DOI: 10.1039/c4ra03397c] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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28
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Wang X, Yao W, Zhou D, Fan H. Theoretical study on the mechanism for NH3BH3reduction of ketones and imines. Mol Phys 2013. [DOI: 10.1080/00268976.2013.766366] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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29
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Moyon NS, Gashnga PM, Phukan S, Mitra S. Specific solvent effect on lumazine photophysics: A combined fluorescence and intrinsic reaction coordinate analysis. Chem Phys 2013. [DOI: 10.1016/j.chemphys.2013.05.012] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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30
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Gas phase Lewis acidity and basicity scales for boranes, phosphines and amines based on the formation of donor–acceptor complexes. COMPUT THEOR CHEM 2013. [DOI: 10.1016/j.comptc.2013.02.007] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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31
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Karkamkar A, Parab K, Camaioni DM, Neiner D, Cho H, Nielsen TK, Autrey T. A thermodynamic and kinetic study of the heterolytic activation of hydrogen by frustrated borane-amine Lewis pairs. Dalton Trans 2013; 42:615-9. [PMID: 22996636 DOI: 10.1039/c2dt31628e] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Calorimetry is used to measure the reaction enthalpies of hydrogen (H(2)) activation by 2,6-lutidine (Lut), 2,2,6,6-tetramethylpiperidine (TMP), N-methyl-2,2,6,6-tetramethylpiperidine (MeTMP), and tri-tert-butylphosphine (TBP) with tris(pentafluorophenyl)borane (BCF). At 6.6 bar H(2) the conversion of the Lewis acid Lewis base pair to the corresponding ionic pair in bromobenzene at 294 K was quantitative in under 60 min. Integration of the heat release from the reaction of the Frustrated Lewis Pair (FLP) with H(2) as a function of time yields a relative rate of hydrogenation in addition to the enthalpy of hydrogenation. The half-lives of hydrogenation range from 230 s with TMP, ΔH(H2) = -31.5(0.2) kcal mol(-1), to 1400 s with Lut, ΔH(H2) = -23.4(0.4) kcal mol(-1). The (11)B nuclear magnetic resonance (NMR) spectrum of B(C(6)F(5))(3) in bromobenzene exhibits three distinct traits depending on the sterics of the Lewis base; (1) in the presence of pyridine, only the dative bond adduct pyridine-B(C(6)F(5))(3) is observed; (2) in the presence of TMP and MeTMP, only the free B(C(6)F(5))(3) is observed; and (3) in the presence of Lut, both the free B(C(6)F(5))(3) and the Lut-B(C(6)F(5))(3) adduct appear in equilibrium. A measure of the change in K(eq) of Lut + B(C(6)F(5))(3) ⇔ Lut-B(C(6)F(5))(3) as a function of temperature provides thermodynamic properties of the Lewis acid Lewis base adduct, ΔH = -17.9(1.0) kcal mol(-1) and a ΔS = -49.2(2.5) cal mol(-1) K, suggesting the Lut-B(C(6)F(5))(3) adduct is more stable in bromobenzene than in toluene.
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Affiliation(s)
- Abhi Karkamkar
- Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, Washington 99354, USA
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32
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Nelson DJ, Egbert JD, Nolan SP. Deuteration of boranes: catalysed versus non-catalysed processes. Dalton Trans 2013; 42:4105-9. [DOI: 10.1039/c3dt33045a] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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33
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Camaioni DM, Ginovska-Pangovska B, Schenter GK, Kathmann SM, Autrey T. Analysis of the Activation and Heterolytic Dissociation of H2 by Frustrated Lewis Pairs: NH3/BX3 (X = H, F, and Cl). J Phys Chem A 2012; 116:7228-37. [DOI: 10.1021/jp3039829] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Donald M. Camaioni
- Chemical
and Materials Science Division, Pacific Northwest National Laboratory, 902 Battelle
Boulevard, Richland, Washington 99352, United States
| | - Bojana Ginovska-Pangovska
- Chemical
and Materials Science Division, Pacific Northwest National Laboratory, 902 Battelle
Boulevard, Richland, Washington 99352, United States
| | - Gregory K. Schenter
- Chemical
and Materials Science Division, Pacific Northwest National Laboratory, 902 Battelle
Boulevard, Richland, Washington 99352, United States
| | - Shawn M. Kathmann
- Chemical
and Materials Science Division, Pacific Northwest National Laboratory, 902 Battelle
Boulevard, Richland, Washington 99352, United States
| | - Tom Autrey
- Chemical
and Materials Science Division, Pacific Northwest National Laboratory, 902 Battelle
Boulevard, Richland, Washington 99352, United States
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34
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Vasiliu M, Grant DJ, Feller D, Dixon DA. Heats of Formation of MHxCly (M = Si, P, As, Sb) Compounds and Main Group Fluorides from High Level Electronic Structure Calculations. J Phys Chem A 2012; 116:3717-27. [DOI: 10.1021/jp2119229] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Monica Vasiliu
- Department of Chemistry, The University of Alabama, Shelby Hall, Tuscaloosa,
Alabama 35487-0336, United States
| | - Daniel J. Grant
- Department of Chemistry, The University of Alabama, Shelby Hall, Tuscaloosa,
Alabama 35487-0336, United States
| | - David Feller
- Department of Chemistry, Washington State University, Pullman, Washington 99164-4630,
United States
| | - David A. Dixon
- Department of Chemistry, The University of Alabama, Shelby Hall, Tuscaloosa,
Alabama 35487-0336, United States
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35
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Chen X, Bao X, Zhao JC, Shore SG. Experimental and Computational Study of the Formation Mechanism of the Diammoniate of Diborane: The Role of Dihydrogen Bonds. J Am Chem Soc 2011; 133:14172-5. [DOI: 10.1021/ja203648w] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xuenian Chen
- Department of Materials Science and Engineering and ‡Department of Chemistry, The Ohio State University, Columbus, Ohio 43210, United States
| | - Xiaoguang Bao
- Department of Materials Science and Engineering and ‡Department of Chemistry, The Ohio State University, Columbus, Ohio 43210, United States
| | - Ji-Cheng Zhao
- Department of Materials Science and Engineering and ‡Department of Chemistry, The Ohio State University, Columbus, Ohio 43210, United States
| | - Sheldon G. Shore
- Department of Materials Science and Engineering and ‡Department of Chemistry, The Ohio State University, Columbus, Ohio 43210, United States
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36
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Moyon NS, Mitra S. Fluorescence solvatochromism in lumichrome and excited-state tautomerization: a combined experimental and DFT study. J Phys Chem A 2011; 115:2456-64. [PMID: 21388154 DOI: 10.1021/jp1102687] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Fluorescence solvatochromism of lumichrome (LC) was studied by steady-state and time-resolved fluorescence spectroscopy. The excited-state properties of LC do not show any correlation with solvent polarity, however, reasonably good correlation with solvent E(T)(30) parameter was observed. A quantitative estimation of contribution from different solvatochromic parameters, like solvent polarizability (π*), hydrogen bond donor (α), and hydrogen bond acceptor (β) ability of the solvent, was made using linear free energy relationship on the basis of Kamlet-Taft equation. The analysis reveals that hydrogen bond donating ability (acidity) of the solvent is the most important parameter that characterizes the excited-state behavior of lumichrome. Quantum mechanical calculations using density functional theory (DFT) were done to study the most stable structure and excited-state tautomerization process of LC toward the formation of isoalloxazines. Charge localization in the excited state and formation of hydrogen-bonded cluster through solvent hydrogen bond donation on the N10 atom of alloxazine moiety were predicted to be the key step toward this water-catalyzed tautomerization process.
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37
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Autrey T, Bowden M, Karkamkar A. Control of hydrogen release and uptake in amine borane molecular complexes: thermodynamics of ammonia borane, ammonium borohydride, and the diammoniate of diborane. Faraday Discuss 2011; 151:157-69; discussion 199-212. [DOI: 10.1039/c0fd00015a] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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