1
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Sánchez M, Baltrusaitis J, Vasquez-Ríos MG, Campillo-Alvarado G, MacGillivray LR, Höpfl H. Nanoscale Dodecahedral and Fullerene-Type Organoboroxine and Borazine Cages from Planar Building Units. NANO LETTERS 2024; 24:5824-5830. [PMID: 38712765 PMCID: PMC11100284 DOI: 10.1021/acs.nanolett.4c01024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2024] [Revised: 04/26/2024] [Accepted: 04/29/2024] [Indexed: 05/08/2024]
Abstract
Boroxine- and borazine-cage analogs to C20, C60, and C70 were calculated and compared in terms of structure, strain indicators, and physical properties relevant to nanoscale applications. The results show C60 and C70 type cages are less strained than the smaller congener, primarily due to minimized bending in the B-arylene-B segments. The smallest cage calculated has a diameter of 2.4 nm, which increases up to 4.9 nm by either variation of the polyhedron (C20 < C60 < C70-type cage) or organic spacer elongation between boron centers. All calculated cages are porous (apertures ranging from 0.6 to 1.9 nm). Molecular electrostatic potential and Hirshfeld population analysis revealed both nucleophilic and electrophilic sites in the interior and exterior cage surfaces. HOMO-LUMO gaps range from 3.98 to 4.89 eV and 5.10-5.18 eV for the boroxine- and borazine-cages, respectively. Our findings provide insights into the design and properties of highly porous boroxine and borazine cages for nanoscience.
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Affiliation(s)
- Mario Sánchez
- Centro
de Investigación en Materiales Avanzados, S.C., Alianza Norte
202, Parque de Investigación en Innovación
Tecnológica (PIIT), Carretera Monterrey-Aeropuerto Km 11, Apodaca 66628, Nuevo León, México
| | - Jonas Baltrusaitis
- Department
of Chemical and Biomolecular Engineering, Lehigh University, Research Drive 111, Bethlehem, Pennsylvania 18015, United States
| | | | | | | | - Herbert Höpfl
- Centro
de Investigaciones Químicas, Instituto de Investigación
en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Chamilpa, Cuernavaca 62209, Morelos, México
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2
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Pajić M, Juribašić Kulcsár M. Solid-State Synthesis of B←N Adducts by the Amine-Facilitated Trimerization of the Phenylboronic Acid. Chemistry 2024; 30:e202400190. [PMID: 38334299 DOI: 10.1002/chem.202400190] [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: 01/17/2023] [Revised: 02/08/2024] [Accepted: 02/09/2024] [Indexed: 02/10/2024]
Abstract
Stable boroxine-amine adducts comprising dative B←N bond(s) were prepared by mechanochemically-induced reactions of phenylboronic acid (PBA) and amines (pyridine, DMAP, 1H-pyrazole, piperidine, DABCO, hexamethylenetetramine, or 4,4'-bipyridine). In-situ Raman monitoring, ex-situ PXRD and DFT calculations were used for product identification. Stoichiometry of the product (3 : 1, 3 : 2 or 6 : 1 adduct) was controlled by the amine structure and the molar ratio of the reactants. The 1 : 2 H-bonded assembly of PBA and 4,4'-bipyridine (bpy) was confirmed as an intermediate in the adduct formation for bpy. Competitive binding experiments indicated that the exchange of the amines in the 3 : 1 adducts follows the computed adduct stabilities that increase with the amine basicity. Following the DFT prediction, the first adduct with two different amines, DMAP and pip, bound to one boroxine moiety was isolated and structurally characterized. Results show that calculations can be used to predict possible and preferred product(s) and their spectral characteristics.
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Affiliation(s)
- Mario Pajić
- Division of Physical Chemistry, Ruđer Bošković Institute, Bijenička cesta 54, HR-10000, Zagreb, Croatia
| | - Marina Juribašić Kulcsár
- Division of Physical Chemistry, Ruđer Bošković Institute, Bijenička cesta 54, HR-10000, Zagreb, Croatia
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3
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Rondelli M, Delgado-Hernández S, Daranas AH, Martín T. Conformational control enables boroxine-to-boronate cage metamorphosis. Chem Sci 2023; 14:12953-12960. [PMID: 38023528 PMCID: PMC10664459 DOI: 10.1039/d3sc02920d] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2023] [Accepted: 10/05/2023] [Indexed: 12/01/2023] Open
Abstract
The discovery of molecular organic cages (MOCs) is inhibited by the limited organic-chemical space of the building blocks designed to fulfill strict geometric requirements for efficient assembly. Using intramolecular attractive or repulsive non-covalent interactions to control the conformation of flexible systems can effectively augment the variety of building blocks, ultimately facilitating the exploration of new MOCs. In this study, we introduce a set of boronic acid tripods that were designed using rational design principles. Conformational control was induced by extending the tripod's arms by a 2,3-dimethylbenzene unit, leading to the efficient formation of a tetrapodal nanometer-sized boroxine cage. The new building block's versatility was demonstrated by performing cage metamorphosis upon adding an aromatic tetraol. This led to a quantitative boroxine-to-boronate transformation and a topological shift from tetrahedral to trigonal bipyramidal.
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Affiliation(s)
- Manuel Rondelli
- Instituto de Productos Naturales y Agrobiología, Consejo Superior de Investigaciones Científicas (IPNA-CSIC) Avda. Astrofísico Francisco Sánchez, 3 38206 La Laguna Tenerife Spain
- Doctoral and Postgraduate School, University of La Laguna (ULL) 38200 La Laguna Tenerife Spain
| | - Samuel Delgado-Hernández
- Instituto de Productos Naturales y Agrobiología, Consejo Superior de Investigaciones Científicas (IPNA-CSIC) Avda. Astrofísico Francisco Sánchez, 3 38206 La Laguna Tenerife Spain
- Departamento de Química, Unidad Departamental de Química Analítica, Universidad de La Laguna (ULL) 38206 La Laguna Tenerife Spain
| | - Antonio H Daranas
- Instituto de Productos Naturales y Agrobiología, Consejo Superior de Investigaciones Científicas (IPNA-CSIC) Avda. Astrofísico Francisco Sánchez, 3 38206 La Laguna Tenerife Spain
- Instituto Universitario de Bio-Orgánica "Antonio González", ULL Avda. Astrofísico Francisco Sánchez, 2 38206 La Laguna Tenerife Spain
| | - Tomás Martín
- Instituto de Productos Naturales y Agrobiología, Consejo Superior de Investigaciones Científicas (IPNA-CSIC) Avda. Astrofísico Francisco Sánchez, 3 38206 La Laguna Tenerife Spain
- Instituto Universitario de Bio-Orgánica "Antonio González", ULL Avda. Astrofísico Francisco Sánchez, 2 38206 La Laguna Tenerife Spain
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4
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Ono K, Sawanaga K, Onodera S, Kawai H, Goto K. Structural Interconversion Based on Intramolecular Boroxine Formation. Chemistry 2023; 29:e202300995. [PMID: 37092863 DOI: 10.1002/chem.202300995] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 04/23/2023] [Accepted: 04/24/2023] [Indexed: 04/25/2023]
Abstract
A novel structural interconversion unit based on intramolecular boroxine formation has been developed. A macrocyclic triboronic acid consisting of three phenylboronic acid units linked by covalent linkers preferentially underwent intramolecular rather than intermolecular boroxine formation, resulting in a quantitative formation of tricyclic boroxine. This structural transformation was accompanied by changes in the polarity, flexibility, and size of the molecule. Dynamic interconversion between the macrocyclic triboronic acid and the tricyclic boroxine was achieved by simple heating/cooling, whereas no boroxine formation occurred upon heating when three boronic acid units were not connected by linkers. Thermodynamic analysis revealed that the entropic advantage of the intramolecular boroxine formation process resulted in these unique features. The entropically stabilized tricyclic boroxine also shows high stability with respect to hydrolysis.
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Affiliation(s)
- Kosuke Ono
- School of Science, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Keisuke Sawanaga
- School of Science, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Satoru Onodera
- Department of Chemistry, Tokyo University of Science, Kagurazaka, Shinjuku-ku, Tokyo, 162-8601, Japan
| | - Hidetoshi Kawai
- Department of Chemistry, Tokyo University of Science, Kagurazaka, Shinjuku-ku, Tokyo, 162-8601, Japan
| | - Kei Goto
- School of Science, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152-8551, Japan
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5
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Pereira‐da‐Silva J, Nunes A, Mendes M, Rodrigues R, Cornetta L, Ferreira da Silva F. Boroxine benzaldehyde complex for pharmaceutical applications probed by electron interactions. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2023; 37:e9418. [PMID: 36261319 PMCID: PMC9787961 DOI: 10.1002/rcm.9418] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Revised: 10/06/2022] [Accepted: 10/11/2022] [Indexed: 06/16/2023]
Abstract
RATIONALE 2,4,6-Tris(4-formylphenyl)boroxine (TFPB) is a substituted boroxine containing a benzaldehyde molecule bonded to each boron atom. Boroxine cages are an emerging class of functional nanostructures used in host-guest chemistry, and benzaldehyde is a potential radiosensitizer. Reactions initiated by low-energy electrons with such complexes may dictate and bring new fundamental knowledge for biomedical and pharmaceutical applications. METHODS The electron ionization properties of TFPB are investigated using a gas-phase electron-molecule crossed beam apparatus coupled with a reflectron time-of-flight mass spectrometer in an orthogonal geometry. Ionization and threshold energies are experimentally determined by mass spectra acquisition as a function of the electron energy. RESULTS The abundance of the molecular precursor cation in the mass spectrum at 70 eV is significantly lower than that of the most abundant fragment C7 H5 O+ . Twenty-nine cationic fragments with relative intensities >2% are detected and identified. The appearance energies of six fragment cations are reported, and the experimental first ionization potential is found at 9.46 ± 0.11 eV. Moreover, eight double cations are identified. The present results are supported by quantum chemical calculations based on bound state techniques, electron ionization models and thermodynamic thresholds. CONCLUSIONS According to these results, the TPFB properties may combine the potential radiosensitizer effect of benzaldehyde with the stability of the boroxine ring.
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Affiliation(s)
- Joao Pereira‐da‐Silva
- CEFITEC, Departamento de Física, NOVA School of Science and TechnologyUniversidade NOVA de LisboaCaparicaPortugal
| | - Ana Nunes
- CEFITEC, Departamento de Física, NOVA School of Science and TechnologyUniversidade NOVA de LisboaCaparicaPortugal
| | - Monica Mendes
- CEFITEC, Departamento de Física, NOVA School of Science and TechnologyUniversidade NOVA de LisboaCaparicaPortugal
| | - Rodrigo Rodrigues
- CEFITEC, Departamento de Física, NOVA School of Science and TechnologyUniversidade NOVA de LisboaCaparicaPortugal
| | - Lucas Cornetta
- Instituto de Física Gleb WataghinUniversidade Estadual de Campinas, CampinasSão PauloBrazil
| | - Filipe Ferreira da Silva
- CEFITEC, Departamento de Física, NOVA School of Science and TechnologyUniversidade NOVA de LisboaCaparicaPortugal
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6
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Drozdov FV, Manokhina EA, Vu TD, Muzafarov AM. Polyborosiloxanes (PBS): Evolution of Approaches to the Synthesis and the Prospects of Their Application. Polymers (Basel) 2022; 14:polym14224824. [PMID: 36432951 PMCID: PMC9696069 DOI: 10.3390/polym14224824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Revised: 10/20/2022] [Accepted: 10/26/2022] [Indexed: 11/12/2022] Open
Abstract
The mini-review deals with borosiloxanes as a class of organoelement compounds that comprise Si-O-B bonds, including individual compounds and polymeric structures. The borosiloxanes first synthesized in the 1950s using simple methods demonstrated very unusual properties but were hydrolytically unstable. However, in recent times, synthetic methods have changed significantly, which made it possible to synthesize borosiloxanes that are resistant to external factors, including atmospheric moisture. Borosiloxanes became important due to their unique properties. For example, borosiloxane liquids acquire a thixotropic behavior due to donor-acceptor interchain interactions. In addition, borosiloxanes are used to produce flame-retardant ceramics. An analysis of the literature sources shows that no review has yet been completed on the topic of borosiloxanes. Therefore, we decided that even a brief outlook of this area would be useful for researchers in this and related fields. Thus, the review shows the evolution of the synthesis methods and covers the studies on the properties of these unique molecules, the latest achievements in this field, and the prospects for their application.
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Affiliation(s)
- Fedor V. Drozdov
- A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 119991 Moscow, Russia
- Enikolopov Institute of Synthetic Polymeric Materials, Russian Academy of Sciences, 117393 Moscow, Russia
- Correspondence:
| | - Elizaveta A. Manokhina
- A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 119991 Moscow, Russia
| | - Tran D. Vu
- Institute of Tropical Durability, Joint Russia-Vietnam Tropical Science and Technology, Hanoi 122103, Vietnam
| | - Aziz M. Muzafarov
- A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 119991 Moscow, Russia
- Enikolopov Institute of Synthetic Polymeric Materials, Russian Academy of Sciences, 117393 Moscow, Russia
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7
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Boronic Acid Esters and Anhydrates as Dynamic Cross-Links in Vitrimers. Polymers (Basel) 2022; 14:polym14040842. [PMID: 35215755 PMCID: PMC8962972 DOI: 10.3390/polym14040842] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2022] [Revised: 02/12/2022] [Accepted: 02/14/2022] [Indexed: 12/02/2022] Open
Abstract
Growing environmental awareness imposes on polymer scientists the development of novel materials that show a longer lifetime and that can be easily recycled. These challenges were largely met by vitrimers, a new class of polymers that merges properties of thermoplastics and thermosets. This is achieved by the incorporation of dynamic covalent bonds into the polymer structure, which provides high stability at the service temperature, but enables the processing at elevated temperatures. Numerous types of dynamic covalent bonds have been utilized for the synthesis of vitrimers. Amongst them, boronic acid-based linkages, namely boronic acid esters and boroxines, are distinguished by their quick exchange kinetics and the possibility of easy application in various polymer systems, from commercial thermoplastics to low molecular weight thermosetting resins. This review covers the development of dynamic cross-links. This review is aimed at providing the state of the art in the utilization of boronic species for the synthesis of covalent adaptable networks. We mainly focus on the synthetic aspects of boronic linkages-based vitrimers construction. Finally, the challenges and future perspectives are provided.
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8
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Ono K, Onodera S, Kawai H. Boroxine template for macrocyclization and postfunctionalization. Chem Commun (Camb) 2022; 58:12544-12547. [DOI: 10.1039/d2cc04691a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Boroxine-templated macrocyclization: Olefin metathesis of boronic acid substrates in the presence of MS4A followed by workup with pinacol yields the desired macrocyclic compounds with modifiable three boron units.
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Affiliation(s)
- Kosuke Ono
- School of Science, Tokyo Institute of Technology, O-okayama Meguro-ku, Tokyo 152-8551, Japan
| | - Satoru Onodera
- Faculty of Science, Tokyo University of Science, Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
| | - Hidetoshi Kawai
- Faculty of Science, Tokyo University of Science, Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
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9
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Pereira da Silva J, Mendes M, Nunes A, Araújo J, Cornetta LM, Ferreira da Silva F. Triphenylboroxine stability under low energy electron interactions. Phys Chem Chem Phys 2022; 24:10025-10032. [DOI: 10.1039/d2cp00855f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Triphenylboroxine (TFB) has chemical properties of great interest in organic synthesis allowing the development of promising molecular architectures. Based on the possibility of geometric arrangement of N-coordinated boron atoms, the...
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10
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Iwasawa N, Ono K. 3D-Boronic Ester Architectures: Synthesis, Host-Guest Chemistry, Dynamic Behavior, and Supramolecular Catalysis. CHEM REC 2021; 22:e202100214. [PMID: 34596949 DOI: 10.1002/tcr.202100214] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Revised: 09/11/2021] [Accepted: 09/13/2021] [Indexed: 11/09/2022]
Abstract
Boronic esters are known to be formed simply by mixing boronic acids and alcohols under neutral conditions, and the equilibrium is in favor of the boronic esters when 1,2- or 1,3-diols are employed as alcohols. By utilizing the dynamic nature of the boronic ester formation, our group successfully constructed unique boron-containing 3D structures, such as ring-shaped macrocycles, cages, and tubes, based on the boronic ester formation of various aromatic di-, tri-, or hexaboronic acids with an originally designed tetrol 1 containing two sets of fixed 1,2-diol units oriented on the same face of an indacene framework. Various functions of the obtained boronates were further pursued to disclose the characteristic features of this system. This personal account describes our self-assembled boronate system using tetrol 1 including synthesis, host-guest chemistry, kinetic connection, characteristic dynamic behaviors, and supramolecular catalysis.
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Affiliation(s)
- Nobuharu Iwasawa
- Department of Chemistry, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Kosuke Ono
- Department of Chemistry, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo, 152-8551, Japan
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11
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12
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Petrushenko IK, Bettinger HF. Hydrogen adsorption on inorganic benzenes decorated with alkali metal cations: theoretical study. Phys Chem Chem Phys 2021; 23:5315-5324. [PMID: 33634299 DOI: 10.1039/d1cp00025j] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Hydrogen adsorption on different benzenes, both organic and inorganic, decorated with Li cations (Li+) was systematically studied by using quantum chemistry techniques. Our calculations demonstrate that Li+-decoration enhances the hydrogen storage ability of the complexes. MP2 calculations reveal that one to five hydrogen molecules per Li+ have high adsorption energies (Ead), up to -4.77 kcal mol-1, which is crucial for effective adsorption/desorption performance. The assessed hydrogen capacity of studied complexes is in the range of 10.0-10.6 wt%. SAPT2 calculations confirmed that induction and electrostatic interactions play the major role for H2 adsorption of the investigated systems, whereas London dispersion contributes to Ead moderately only in the cases of large number of hydrogen molecules adsorbed. Independent gradient model (IGM) analysis showed that there exists non-covalent bonding between Li+ and H2. The obtained van't Hoff desorption temperatures substantially exceed the temperature of liquid nitrogen. Ab initio molecular dynamics simulations confirmed the stability of the studied complexes. Our investigations establish the high potential of the studied complexes for usage in systems for hydrogen storage.
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Affiliation(s)
- Igor K Petrushenko
- Irkutsk National Research Technical University, 83 Lermontov St., 664074 Irkutsk, Russia.
| | - Holger F Bettinger
- Institut für Organische Chemie, Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany
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13
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Ota K, Kinjo R. Aromatic nature of neutral and dianionic 1,4-diaza-2,3,5,6-tetraborinine derivatives. RSC Adv 2020; 11:592-598. [PMID: 35423032 PMCID: PMC8691108 DOI: 10.1039/d0ra09040a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Accepted: 12/15/2020] [Indexed: 11/21/2022] Open
Abstract
The aromatically relevant parameters of boron-rich inorganic benzenes-neutral and dianionic 1,4-diaza-2,3,5,6-tetraborinine derivatives (B4N2R6)-have been computationally estimated and evaluated from geometric, electronic, magnetic, and energetic points of view. The majority of the criteria (ASE, NICSzz, ELF, and PDI) indicate that the aromaticity of the neutral B4N2 benzene analogue stabilized by Lewis bases lies in between those of benzene and borazine. On the other hand, the aromaticity of the dianionic B4N2 benzene analogue 4' is controversial. The pronounced aromatic nature of 4' is supported by ELFπ, PDI, and NICSπzz, but ASE, the FiPC-NICS plot, and ACID oppose this. These data confirm that even with the same B4N2-skeletal framework of a 6π-system, the aromatic feature varies depending on the overall charge of the B4N2 systems.
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Affiliation(s)
- Kei Ota
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore
| | - Rei Kinjo
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore
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14
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Ota K, Kinjo R. Inorganic Benzene Valence Isomers. Chem Asian J 2020; 15:2558-2574. [DOI: 10.1002/asia.202000535] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Revised: 06/03/2020] [Indexed: 01/07/2023]
Affiliation(s)
- Kei Ota
- Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University Nanyang Link 21 Singapore 637371 Singapore
| | - Rei Kinjo
- Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University Nanyang Link 21 Singapore 637371 Singapore
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15
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Ota K, Kinjo R. A Neutral and Aromatic Boron‐Rich Inorganic Benzene. Angew Chem Int Ed Engl 2020; 59:6572-6575. [DOI: 10.1002/anie.201915790] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Revised: 01/24/2020] [Indexed: 01/22/2023]
Affiliation(s)
- Kei Ota
- Division of Chemistry and Biological ChemistrySchool of Physical and Mathematical SciencesNanyang Technological University Nanyang Link 21 Singapore 637371 Singapore
| | - Rei Kinjo
- Division of Chemistry and Biological ChemistrySchool of Physical and Mathematical SciencesNanyang Technological University Nanyang Link 21 Singapore 637371 Singapore
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16
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Affiliation(s)
- Kei Ota
- Division of Chemistry and Biological ChemistrySchool of Physical and Mathematical SciencesNanyang Technological University Nanyang Link 21 Singapore 637371 Singapore
| | - Rei Kinjo
- Division of Chemistry and Biological ChemistrySchool of Physical and Mathematical SciencesNanyang Technological University Nanyang Link 21 Singapore 637371 Singapore
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17
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Li SS, Lv XH, Sun XL, Wan WM, Bao H. Well-controlled polymerization of tri-vinyl dynamic covalent boroxine monomer: one dynamic covalent boroxine moiety toward a tunable penta-responsive polymer. Polym Chem 2020. [DOI: 10.1039/d0py00401d] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Attributed to dynamic characteristics of dynamic covalent boroxine, well-controlled polymerization of tri-vinyl monomer and molecular design of penta-responsive polymer with only one functional moiety are achieved.
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Affiliation(s)
- Shun-Shun Li
- State Key Laboratory of Structural Chemistry
- Key Laboratory of Coal to Ethylene Glycol and Its Related Technology
- Center for Excellence in Molecular Synthesis, Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou 350002
| | - Xin-Hu Lv
- State Key Laboratory of Heavy Oil Processing and Center for Bioengineering and Biotechnology, China University of Petroleum (East China)
- Qingdao 266580
- P. R. of China
| | - Xiao-Li Sun
- State Key Laboratory of Heavy Oil Processing and Center for Bioengineering and Biotechnology, China University of Petroleum (East China)
- Qingdao 266580
- P. R. of China
| | - Wen-Ming Wan
- State Key Laboratory of Structural Chemistry
- Key Laboratory of Coal to Ethylene Glycol and Its Related Technology
- Center for Excellence in Molecular Synthesis, Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou 350002
| | - Hongli Bao
- State Key Laboratory of Structural Chemistry
- Key Laboratory of Coal to Ethylene Glycol and Its Related Technology
- Center for Excellence in Molecular Synthesis, Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou 350002
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18
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Cai ZF, Zhan G, Daukiya L, Eyley S, Thielemans W, Severin K, De Feyter S. Electric-Field-Mediated Reversible Transformation between Supramolecular Networks and Covalent Organic Frameworks. J Am Chem Soc 2019; 141:11404-11408. [DOI: 10.1021/jacs.9b05265] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Zhen-Feng Cai
- Department of Chemistry, Division of Molecular Imaging and Photonics, KU Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium
| | - Gaolei Zhan
- Department of Chemistry, Division of Molecular Imaging and Photonics, KU Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium
| | - Lakshya Daukiya
- Department of Chemistry, Division of Molecular Imaging and Photonics, KU Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium
| | - Samuel Eyley
- Department of Chemical Engineering, Renewable Materials and Nanotechnology Group, Campus Kortrijk, KU Leuven, Etienne Sabbelaan 53, 8500 Kortrijk, Belgium
| | - Wim Thielemans
- Department of Chemical Engineering, Renewable Materials and Nanotechnology Group, Campus Kortrijk, KU Leuven, Etienne Sabbelaan 53, 8500 Kortrijk, Belgium
| | - Kay Severin
- Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
| | - Steven De Feyter
- Department of Chemistry, Division of Molecular Imaging and Photonics, KU Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium
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19
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St-Jean F, Piechowicz KA, Sirois LE, Angelaud R, Gosselin F. Study of a Competing Hydrodefluorination Reaction During the Directed ortho-Lithiation/Borylation of 2-Fluorobenzaldehyde. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00730] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Frédéric St-Jean
- Department of Small Molecule Process Chemistry, Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Katarzyna A. Piechowicz
- Department of Small Molecule Process Chemistry, Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Lauren E. Sirois
- Department of Small Molecule Process Chemistry, Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Rémy Angelaud
- Department of Small Molecule Process Chemistry, Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
| | - Francis Gosselin
- Department of Small Molecule Process Chemistry, Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States
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20
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Erb W, Hurvois JP, Roisnel T, Dorcet V. Ferroceneboronic Acid and Derivatives: Synthesis, Structure, Electronic Properties, and Reactivity in Directed C–H Bond Activation. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00501] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- William Erb
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes) - UMR 6226, F-35000 Rennes, France
| | - Jean-Pierre Hurvois
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes) - UMR 6226, F-35000 Rennes, France
| | - Thierry Roisnel
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes) - UMR 6226, F-35000 Rennes, France
| | - Vincent Dorcet
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes) - UMR 6226, F-35000 Rennes, France
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21
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Adamczyk-Woźniak A, Kaczorowska E, Kredátusova J, Madura I, Marek PH, Matuszewska A, Sporzyński A, Uchman M. Dehydration ofortho-,meta- andpara-Alkoxy Phenylboronic Acids to their Corresponding Boroxines. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201701485] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Agnieszka Adamczyk-Woźniak
- Department of Physical Chemistry; Faculty of Chemistry; Warsaw University of Technology; Noakowskiego 3 00-664 Warsaw Poland
| | - Ewa Kaczorowska
- Department of Physical Chemistry; Faculty of Chemistry; Warsaw University of Technology; Noakowskiego 3 00-664 Warsaw Poland
| | - Jana Kredátusova
- Institute of Macromolecular Chemistry AS CR; Heyrovsky Sq. 2 162 06 Prague 6 Czech Republic
| | - Izabela Madura
- Department of Physical Chemistry; Faculty of Chemistry; Warsaw University of Technology; Noakowskiego 3 00-664 Warsaw Poland
| | - Paulina H. Marek
- Department of Physical Chemistry; Faculty of Chemistry; Warsaw University of Technology; Noakowskiego 3 00-664 Warsaw Poland
| | - Alicja Matuszewska
- Department of Physical Chemistry; Faculty of Chemistry; Warsaw University of Technology; Noakowskiego 3 00-664 Warsaw Poland
- Department of Physical and Macromolecular Chemistry; Faculty of Science; Charles University; Hlavova 2030 128 40 Prague 2 Czech Republic
| | - Andrzej Sporzyński
- Department of Physical Chemistry; Faculty of Chemistry; Warsaw University of Technology; Noakowskiego 3 00-664 Warsaw Poland
| | - Mariusz Uchman
- Department of Physical and Macromolecular Chemistry; Faculty of Science; Charles University; Hlavova 2030 128 40 Prague 2 Czech Republic
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22
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Ono K, Shimo S, Takahashi K, Yasuda N, Uekusa H, Iwasawa N. Dynamic Interconversion between Boroxine Cages Based on Pyridine Ligation. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201713221] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Kosuke Ono
- Department of Chemistry; Tokyo Institute of Technology; O-okayama, Meguro-ku Tokyo 152-8551 Japan
- Present address: Department of Chemistry; Faculty of Science; Tokyo University of Science; Tokyo 162-8601 Japan
| | - Shunsuke Shimo
- Department of Chemistry; Tokyo Institute of Technology; O-okayama, Meguro-ku Tokyo 152-8551 Japan
| | - Kohei Takahashi
- Department of Chemistry; Tokyo Institute of Technology; O-okayama, Meguro-ku Tokyo 152-8551 Japan
| | - Nobuhiro Yasuda
- Research & Utilization Division; Japan Synchrotron Radiation Research Institute; Kouto Sayo-cho Sayo-gun, Hyogo 679-5198 Japan
| | - Hidehiro Uekusa
- Department of Chemistry; Tokyo Institute of Technology; O-okayama, Meguro-ku Tokyo 152-8551 Japan
| | - Nobuharu Iwasawa
- Department of Chemistry; Tokyo Institute of Technology; O-okayama, Meguro-ku Tokyo 152-8551 Japan
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23
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Ono K, Shimo S, Takahashi K, Yasuda N, Uekusa H, Iwasawa N. Dynamic Interconversion between Boroxine Cages Based on Pyridine Ligation. Angew Chem Int Ed Engl 2018; 57:3113-3117. [PMID: 29380501 DOI: 10.1002/anie.201713221] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Indexed: 01/01/2023]
Abstract
Dynamic interconversion between large covalent organic cages was achieved simply by heating or acid/base treatment. A mixture of the boroxine cages 12-mer and 15-mer was cleanly converted into a pyridine adduct of the 9-mer boroxine cage upon treatment with pyridine, and the geometry of N-coordinated boron atoms changed from trigonal to tetrahedral. The reverse reaction was achieved by heating or acid treatment. In this process, the larger boroxine cages 12-mer and 15-mer were found to be entropically favored owing to the release of free pyridine molecules from 9-mer⋅6 Py.
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Affiliation(s)
- Kosuke Ono
- Department of Chemistry, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152-8551, Japan.,Present address: Department of Chemistry, Faculty of Science, Tokyo University of Science, Tokyo, 162-8601, Japan
| | - Shunsuke Shimo
- Department of Chemistry, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Kohei Takahashi
- Department of Chemistry, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Nobuhiro Yasuda
- Research & Utilization Division, Japan Synchrotron Radiation Research Institute, Kouto, Sayo-cho, Sayo-gun, Hyogo, 679-5198, Japan
| | - Hidehiro Uekusa
- Department of Chemistry, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Nobuharu Iwasawa
- Department of Chemistry, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152-8551, Japan
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24
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Unique physicochemical and catalytic properties dictated by the B3NO2 ring system. Nat Chem 2017; 9:571-577. [DOI: 10.1038/nchem.2708] [Citation(s) in RCA: 115] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Accepted: 11/23/2016] [Indexed: 12/12/2022]
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25
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Bloomfield AJ, Matula AJ, Mercado BQ, Batista VS, Crabtree RH. Organometallic Iridium Complex Containing a Dianionic, Tridentate, Mixed Organic–Inorganic Ligand. Inorg Chem 2016; 55:8121-9. [DOI: 10.1021/acs.inorgchem.6b01218] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Aaron J. Bloomfield
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - Adam J. Matula
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - Brandon Q. Mercado
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - Victor S. Batista
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - Robert H. Crabtree
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States
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26
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Goldberg AR, Northrop BH. Spectroscopic and Computational Investigations of The Thermodynamics of Boronate Ester and Diazaborole Self-Assembly. J Org Chem 2016; 81:969-80. [PMID: 26734844 DOI: 10.1021/acs.joc.5b02548] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The solution phase self-assembly of boronate esters, diazaboroles, oxathiaboroles, and dithiaboroles from the condensation of arylboronic acids with aromatic diol, diamine, hydroxythiol, and dithiol compounds in chloroform has been investigated by (1)H NMR spectroscopy and computational methods. Six arylboronic acids were included in the investigations with each boronic acid varying in the substituent at its 4-position. Both computational and experimental results show that the para-substituent of the arylboronic acid does not significantly influence the favorability of forming a condensation product with a given organic donor. The type of donor, however, greatly influences the favorability of self-assembly. (1)H NMR spectroscopy indicates that condensation reactions between arylboronic acids and catechol to give boronate esters are the most favored thermodynamically, followed by diazaborole formation. Computational investigations support this conclusion. Neither oxathiaboroles nor dithiaboroles form spontaneously at equilibrium in chloroform at room temperature. Computational results suggest that the effect of borylation on the frontier orbitals of each donor helps to explain differences in the favorability of their condensation reactions with arylboronic acids. The results can inform the use of boronic acids as they are increasingly utilized in the dynamic self-assembly of organic materials and as components in dynamic combinatorial libraries.
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Affiliation(s)
- Alexander R Goldberg
- Department of Chemistry, Wesleyan University , Middletown, Connecticut 06459, United States
| | - Brian H Northrop
- Department of Chemistry, Wesleyan University , Middletown, Connecticut 06459, United States
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27
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Cruz‐Huerta J, Campillo‐Alvarado G, Höpfl H, Rodríguez‐Cuamatzi P, Reyes‐Márquez V, Guerrero‐Álvarez J, Salazar‐Mendoza D, Farfán‐García N. Self‐Assembly of Triphenylboroxine and the Phenylboronic Ester of Pentaerythritol with Piperazine,
trans
‐1,4‐Diaminocyclohexane, and 4‐Aminopyridine. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201501121] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Jorge Cruz‐Huerta
- Centro de Investigaciones Químicas, Instituto de Investigación en Ciencias Básicas e Aplicadas, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Chamilpa, Cuernavaca 62209, Morelos, México
| | - Gonzalo Campillo‐Alvarado
- Centro de Investigaciones Químicas, Instituto de Investigación en Ciencias Básicas e Aplicadas, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Chamilpa, Cuernavaca 62209, Morelos, México
| | - Herbert Höpfl
- Centro de Investigaciones Químicas, Instituto de Investigación en Ciencias Básicas e Aplicadas, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Chamilpa, Cuernavaca 62209, Morelos, México
| | - Patricia Rodríguez‐Cuamatzi
- Centro de Investigaciones Químicas, Instituto de Investigación en Ciencias Básicas e Aplicadas, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Chamilpa, Cuernavaca 62209, Morelos, México
| | - Viviana Reyes‐Márquez
- Centro de Investigaciones Químicas, Instituto de Investigación en Ciencias Básicas e Aplicadas, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Chamilpa, Cuernavaca 62209, Morelos, México
| | - Jorge Guerrero‐Álvarez
- Centro de Investigaciones Químicas, Instituto de Investigación en Ciencias Básicas e Aplicadas, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Chamilpa, Cuernavaca 62209, Morelos, México
| | - Domingo Salazar‐Mendoza
- Universidad Tecnológica de la Mixteca, Carretera a Acatlima Km 2.5, Huajuapan de León 69000, Oaxaca, México
| | - Norberto Farfán‐García
- Facultad de Química, Departamento Química Orgánica, Universidad Nacional Autónoma de México, Cd. Universitaria, Coyoacán, México 04510, México
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28
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Ono K, Johmoto K, Yasuda N, Uekusa H, Fujii S, Kiguchi M, Iwasawa N. Self-Assembly of Nanometer-Sized Boroxine Cages from Diboronic Acids. J Am Chem Soc 2015; 137:7015-8. [DOI: 10.1021/jacs.5b02716] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
| | | | - Nobuhiro Yasuda
- Japan Synchrotron Radiation Research Institute/SPring-8, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan
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29
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Dostál L, Jambor R, Růžička A, Jirásko R, Lyčka A, Beckmann J, Ketkov S. From Stiba- and Bismaheteroboroxines to N,C,N-Chelated Diorganoantimony(III) and Bismuth(III) Cations-An Unexpected Case of Aryl Group Migration. Inorg Chem 2015; 54:6010-9. [PMID: 26016827 DOI: 10.1021/acs.inorgchem.5b00893] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An unprecedented transfer of an aryl group from boron to Sb and Bi is observed in the reaction of heteroboroxines of general formula ArM[(OBR)2O] [where M = Sb, Bi; Ar = C6H3-2,6-(CH2NMe2)2; R = Ph, 4-CF3C6H4, 4-BrC6H4] with corresponding boronic acid RB(OH)2. Using this procedure, ion pairs [ArMR](+)[R4B5O6](-) were obtained [where M = Sb and R = Ph (4), 4-CF3C6H4 (5), 4-BrC6H4 (6); where M = Bi and R = Ph (7), 4-CF3C6H4 (8), 4-BrC6H4 (9)]. All compounds were characterized using elemental analysis, electrospray ionization mass spectrometry, and multinuclear NMR spectroscopy, and molecular structures of 4 and 7 were determined by single-crystal X-ray diffraction analysis. The central metal atoms in 4-9 were arylated by respective boronic acids, which represents, to the best of our knowledge, unprecedented reaction path in the chemistry of heavier group 15 elements. Investigation of the mechanism of this transformation indicated that Lewis pairs consisting of monomeric oxides ArMO and boroxine rings are probably key intermediates. In this regard, molecular structures of ArSbO[(4-CF3C6H4)3B3O3]·(4-CF3C6H4)B(OH)2 (10) and {ArSbO[(3,5-(CF3)2C6H3)3B3O3]} (13) were established by single-crystal X-ray diffraction analysis, and compound 13 was also fully characterized in solution by multinuclear NMR spectroscopy. The bonding in 13 was analyzed in detail by using density functional theory and natural bond order calculations and compared with known adduct ArSbOB(C6F5)3 (14) and hypothetical ArSbO monomer.
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Affiliation(s)
| | | | | | | | - Antonín Lyčka
- §Research Institute for Organic Syntheses, Rybitví 296, CZ 533 54 Pardubice, Czech Republic
| | - Jens Beckmann
- ∥Institut für Anorganische Chemie, Universität Bremen, Leobener Straße, 28359 Bremen, Germany
| | - Sergey Ketkov
- ⊥G.A.Razuvaev Institute of Organometallic Chemistry, RAS, 49 Tropinin Street, 603950 Nizhny Novgorod, Russian Federation.,#N.I. Lobachevsky Nizhny Novgorod State University, Gagarin Avenue 23, 603950 Nizhny Novgorod, Russian Federation
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30
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Kubo Y, Nishiyabu R, James TD. Hierarchical supramolecules and organization using boronic acid building blocks. Chem Commun (Camb) 2015; 51:2005-20. [DOI: 10.1039/c4cc07712a] [Citation(s) in RCA: 118] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Current progress on hierarchical supramolecules using boronic acids has been highlighted in this feature article. The feasibility of the structure-directing ability is fully discussed from the standpoint of the generation of new smart materials.
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Affiliation(s)
- Yuji Kubo
- Department of Applied Chemistry
- Graduate School of Urban Environmental Sciences
- Tokyo Metropolitan University
- Hachioji
- Japan
| | - Ryuhei Nishiyabu
- Department of Applied Chemistry
- Graduate School of Urban Environmental Sciences
- Tokyo Metropolitan University
- Hachioji
- Japan
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31
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Kořenková M, Erben M, Jambor R, Růžička A, Dostál L. The reactivity of N,C,N-intramolecularly coordinated antimony(III) and bismuth(III) oxides with the sterically encumbered organoboronic acid 2,6-i-Pr2C6H3B(OH)2. J Organomet Chem 2014. [DOI: 10.1016/j.jorganchem.2014.09.032] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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32
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Wöhrle T, Baro A, Laschat S. Novel Discotic Boroxines: Synthesis and Mesomorphic Properties. MATERIALS 2014; 7:4045-4056. [PMID: 28788664 PMCID: PMC5453236 DOI: 10.3390/ma7054045] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/08/2014] [Revised: 05/07/2014] [Accepted: 05/08/2014] [Indexed: 11/24/2022]
Abstract
A new synthetic approach to highly substituted triphenylboroxines 11 is described. Their mesomorphic properties were investigated by differential scanning calorimetry (DSC), polarizing optical microscopy (POM) and X-ray diffraction (SAXS, WAXS). The tris(3,4,5-trialkyloxy)phenyl functionalized derivatives 11b–e showed broad mesophases for a minimum alkyl chain length of C9. The phase widths ranged from 110 K to 77 K near room temperature, thus decreasing with enhanced alkyl chain lengths. Textures observed under POM indicated a columnar hexagonal (Colh) mesophase symmetry that was confirmed by X-ray diffraction experiments.
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Affiliation(s)
- Tobias Wöhrle
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, Stuttgart D-70569, Germany.
| | - Angelika Baro
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, Stuttgart D-70569, Germany.
| | - Sabine Laschat
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, Stuttgart D-70569, Germany.
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33
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Clair S, Abel M, Porte L. Growth of boronic acid based two-dimensional covalent networks on a metal surface under ultrahigh vacuum. Chem Commun (Camb) 2014; 50:9627-35. [DOI: 10.1039/c4cc02678k] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
An extensive analysis of the complex mechanisms governing the on-surface polymerisation of boronic acid on a metal surface under vacuum.
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Affiliation(s)
- Sylvain Clair
- Aix Marseille Université
- CNRS
- Université de Toulon
- 13397 Marseille, France
| | - Mathieu Abel
- Aix Marseille Université
- CNRS
- Université de Toulon
- 13397 Marseille, France
| | - Louis Porte
- Aix Marseille Université
- CNRS
- Université de Toulon
- 13397 Marseille, France
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