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Yano Y, Kasai H, Zheng Y, Nishibori E, Hisaeda Y, Ono T. Multicomponent Crystals with Competing Intermolecular Interactions: In Situ X‐ray Diffraction and Luminescent Features Reveal Multimolecular Assembly under Mechanochemical Conditions. Angew Chem Int Ed Engl 2022; 61:e202203853. [DOI: 10.1002/anie.202203853] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Indexed: 11/07/2022]
Affiliation(s)
- Yoshio Yano
- Department of Chemistry and Biochemistry Graduate School of Engineering Center for Molecular Systems (CMS) Kyushu University 744 Motooka, Nishi-ku Fukuoka 819-0395 Japan
| | - Hidetaka Kasai
- Department of Physics Faculty of Pure and Applied Sciences and Tsukuba Research Center for Energy Materials Science (TREMS) University of Tsukuba 1-1-1 Tennodai Tsukuba Ibaraki 305-8571 Japan
| | - Yanyan Zheng
- Department of Physics Faculty of Pure and Applied Sciences and Tsukuba Research Center for Energy Materials Science (TREMS) University of Tsukuba 1-1-1 Tennodai Tsukuba Ibaraki 305-8571 Japan
| | - Eiji Nishibori
- Department of Physics Faculty of Pure and Applied Sciences and Tsukuba Research Center for Energy Materials Science (TREMS) University of Tsukuba 1-1-1 Tennodai Tsukuba Ibaraki 305-8571 Japan
| | - Yoshio Hisaeda
- Department of Chemistry and Biochemistry Graduate School of Engineering Center for Molecular Systems (CMS) Kyushu University 744 Motooka, Nishi-ku Fukuoka 819-0395 Japan
| | - Toshikazu Ono
- Department of Chemistry and Biochemistry Graduate School of Engineering Center for Molecular Systems (CMS) Kyushu University 744 Motooka, Nishi-ku Fukuoka 819-0395 Japan
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2
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Yano Y, Kasai H, Zheng Y, Nishibori E, Hisaeda Y, Ono T. Multicomponent Crystals with Competing Intermolecular Interactions: In Situ X‐ray Diffraction and Luminescent Features Reveal Multimolecular Assembly of Mechanochemical Conditions. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202203853] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Yoshio Yano
- Kyushu University: Kyushu Daigaku Department of Chemistry and Biochemistry, Graduate School of Engineering JAPAN
| | - Hidetaka Kasai
- University of Tsukuba: Tsukuba Daigaku Department of Physics, Faculty of Pure and Applied Sciences and Tsukuba Research Center for Energy Materials Science (TREMS) JAPAN
| | - Yanyan Zheng
- University of Tsukuba: Tsukuba Daigaku Department of Physics, Faculty of Pure and Applied Sciences and Tsukuba Research Center for Energy Materials Science (TREMS) JAPAN
| | - Eiji Nishibori
- University of Tsukuba: Tsukuba Daigaku Department of Physics, Faculty of Pure and Applied Sciences and Tsukuba Research Center for Energy Materials Science (TREMS) JAPAN
| | - Yoshio Hisaeda
- Kyushu University: Kyushu Daigaku Department of Chemistry and Biochemistry, Graduate School of Engineering JAPAN
| | - Toshikazu Ono
- Kyushu University Department of Chemistry and Biochemistry, Graduate School of Engineering 744 Motooka, Nishi 819-0395 Fukuoka JAPAN
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Guadalupe Vasquez‐Ríos M, Campillo‐Alvarado G, Swenson DC, Höpfl H, MacGillivray LR. Structures and Reactivities of Cocrystals Involving Diboronic Acids and Bipyridines: In Situ Linker Reaction and 1D‐to‐2D Dimensionality Change via Crystal‐to‐Crystal Photodimerization. Chemistry 2022; 28:e202104604. [PMID: 35274391 PMCID: PMC9310599 DOI: 10.1002/chem.202104604] [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: 12/28/2021] [Indexed: 11/15/2022]
Abstract
Cocrystallizations of diboronic acids [1,3‐benzenediboronic acid (1,3‐bdba), 1,4‐benzenediboronic acid (1,4‐bdba) and 4,4’‐biphenyldiboronic acid (4,4’‐bphdba)] and bipyridines [1,2‐bis(4‐pyridyl)ethylene (bpe) and 1,2‐bis(4‐pyridyl)ethane (bpeta)] generated the hydrogen‐bonded 1 : 2 cocrystals [(1,4‐bdba)(bpe)2] (1), [(1,4‐bdba)(bpeta)2] (2), [(1,3‐bdba)(bpe)2(H2O)2] (3) and [(1,3‐bdba)(bpeta)2(H2O)] (4), wherein 1,3‐bdba involved hydrated assemblies. The linear extended 4,4’‐bphdba exhibited the formation of 1 : 1 cocrystals [(4,4'‐bphdba)(bpe)] (5) and [(4,4'‐bphdba‐me)(bpeta)] (6). For 6, a hemiester was generated by an in‐situ linker transformation. Single‐crystal X‐ray diffraction revealed all structures to be sustained by B(O)−H⋅⋅⋅N, B(O)−H⋅⋅⋅O, Ow−H⋅⋅⋅O, Ow−H⋅⋅⋅N, C−H⋅⋅⋅O, C−H⋅⋅⋅N, π⋅⋅⋅π, and C−H⋅⋅⋅π interactions. The cocrystals comprise 1D, 2D, and 3D hydrogen‐bonded frameworks with components that display reactivities upon cocrystal formation and within the solids. In 1 and 3, the C=C bonds of the bpe molecules undergo a [2+2] photodimerization. UV radiation of each compound resulted in quantitative conversion of bpe into cyclobutane tpcb. The reactivity involving 1 occurred via 1D‐to‐2D single‐crystal‐to‐single‐crystal (SCSC) transformation. Our work supports the feasibility of the diboronic acids as formidable structural and reactivity building blocks for cocrystal construction.
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Affiliation(s)
| | - Gonzalo Campillo‐Alvarado
- Department of Chemical and Biomolecular Engineering University of Illinois Urbana-Champaign 600 S. Mathews Avenue Urbana IL 61801 USA
| | - Dale C. Swenson
- Department of Chemistry University of Iowa Iowa City, 1A 52242-1294 USA
| | - 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 (México
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4
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Athiyarath V, Madhusudhanan MC, Kunnikuruvan S, Sureshan KM. Secondary Structure Tuning of a Pseudoprotein Between β‐Meander and α‐Helical Forms in the Solid‐State. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202113129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Vignesh Athiyarath
- School of Chemistry Indian Institute of Science Education and Research Thiruvananthapuram Kerala 695551 India
| | - Mithun C. Madhusudhanan
- School of Chemistry Indian Institute of Science Education and Research Thiruvananthapuram Kerala 695551 India
| | - Sooraj Kunnikuruvan
- School of Chemistry Indian Institute of Science Education and Research Thiruvananthapuram Kerala 695551 India
| | - Kana M. Sureshan
- School of Chemistry Indian Institute of Science Education and Research Thiruvananthapuram Kerala 695551 India
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5
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Athiyarath V, Madhusudhanan MC, Kunnikuruvan S, Sureshan KM. Secondary Structure Tuning of a Pseudoprotein Between β-Meander and α-Helical Forms in the Solid-State. Angew Chem Int Ed Engl 2021; 61:e202113129. [PMID: 34699112 DOI: 10.1002/anie.202113129] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Indexed: 12/23/2022]
Abstract
Tuning the secondary structure of a protein or polymer in the solid-state is challenging. Here we report the topochemical synthesis of a pseudoprotein and its secondary structure tuning in the solid-state. We designed the dipeptide monomer N3 -Leu-Ala-NH-CH2 -C≡CH (1) for topochemical azide-alkyne cycloaddition (TAAC) polymerization. Dipeptide 1 adopts an anti-parallel β-sheet-like stacked arrangement in its crystals. Upon heating, the dipeptide undergoes quantitative TAAC polymerization in a crystal-to-crystal fashion yielding large polymers. The reaction occurs between the adjacent monomers in the H-bonded anti-parallel stack, yielding pseudoprotein having a β-meander structure. When dissolved in methanol, this pseudoprotein changes its secondary structure from β-meander to α-helical form and it retains the new secondary structure upon desolvation. This work demonstrates a novel paradigm for tuning the secondary structure of a polymer in the solid-state.
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Affiliation(s)
- Vignesh Athiyarath
- School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram, Kerala, 695551, India
| | - Mithun C Madhusudhanan
- School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram, Kerala, 695551, India
| | - Sooraj Kunnikuruvan
- School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram, Kerala, 695551, India
| | - Kana M Sureshan
- School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram, Kerala, 695551, India
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Athiyarath V, Sureshan KM. Designed Synthesis of a 1D Polymer in Twist-Stacked Topology via Single-Crystal-to-Single-Crystal Polymerization. Angew Chem Int Ed Engl 2020; 59:15580-15585. [PMID: 32779302 DOI: 10.1002/anie.202006758] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2020] [Revised: 06/05/2020] [Indexed: 12/16/2022]
Abstract
To synthesize a fully organic 1D polymer in a novel twist-stacked topology, we designed a peptide monomer HC≡CCH2 -NH-Ile-Leu-N3 , which crystallizes with its molecules H-bonded along a six-fold screw axis. These H-bonded columns pack parallelly such that molecules arrange head-to-tail, forming linear non-covalent chains in planes perpendicular to the screw axis. The chains arrange parallelly to form molecular layers which twist-stack along the screw axis. Crystals of this monomer, on heating, undergo single-crystal-to-single-crystal (SCSC) topochemical azide-alkyne cycloaddition (TAAC) polymerization to yield an exclusively 1,4-triazole-linked polymer in a twist-stacked layered topology. This topologically defined polymer shows better mechanical strength and thermal stability than its unordered form, as evidenced by nanoindentation studies and thermogravimetric analysis, respectively. This work illustrates the scope of topochemical polymerizations for synthesizing polymers in pre-decided topologies.
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Affiliation(s)
- Vignesh Athiyarath
- School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram, Kerala, 695551, India
| | - Kana M Sureshan
- School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram, Kerala, 695551, India
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7
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Athiyarath V, Sureshan KM. Designed Synthesis of a 1D Polymer in Twist‐Stacked Topology via Single‐Crystal‐to‐Single‐Crystal Polymerization. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202006758] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Vignesh Athiyarath
- School of Chemistry Indian Institute of Science Education and Research Thiruvananthapuram Kerala 695551 India
| | - Kana M. Sureshan
- School of Chemistry Indian Institute of Science Education and Research Thiruvananthapuram Kerala 695551 India
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8
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Campillo-Alvarado G, Li C, Feng Z, Hutchins KM, Swenson DC, Höpfl H, Morales-Rojas H, MacGillivray LR. Single-Crystal-to-Single-Crystal [2 + 2] Photodimerization Involving B←N Coordination with Generation of a Thiophene Host. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00258] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Changan Li
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
| | - Zhiting Feng
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
| | - Kristin M. Hutchins
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
| | - Dale C. Swenson
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, 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, Cuernavaca 62209, México
| | - Hugo Morales-Rojas
- Centro de Investigaciones Químicas, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Cuernavaca 62209, México
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9
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Hema K, Sureshan KM. β-Sheet to Helical-Sheet Evolution Induced by Topochemical Polymerization: Cross-α-Amyloid-like Packing in a Pseudoprotein with Gly-Phe-Gly Repeats. Angew Chem Int Ed Engl 2020; 59:8854-8859. [PMID: 32149438 DOI: 10.1002/anie.201914975] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2019] [Revised: 03/07/2020] [Indexed: 12/14/2022]
Abstract
Protein-mimics are of great interest for their structure, stability, and properties. We are interested in the synthesis of protein-mimics containing triazole linkages as peptide-bond surrogate by topochemical azide-alkyne cycloaddition (TAAC) polymerization of azide- and alkyne-modified peptides. The rationally designed dipeptide N3 -CH2 CO-Phe-NHCH2 CCH (1) crystallized in a parallel β-sheet arrangement and are head-to-tail aligned in a direction perpendicular to the β-sheet-direction. Upon heating, crystals of 1 underwent single-crystal-to-single-crystal polymerization forming a triazole-linked pseudoprotein with Gly-Phe-Gly repeats. During TAAC polymerization, the pseudoprotein evolved as helical chains. These helical chains are laterally assembled by backbone hydrogen bonding in a direction perpendicular to the helical axis to form helical sheets. This interesting helical-sheet orientation in the crystal resembles the cross-α-amyloids, where α-helices are arranged laterally as sheets.
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Affiliation(s)
- Kuntrapakam Hema
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Kerala, 695551, India
| | - Kana M Sureshan
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Kerala, 695551, India
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10
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Hema K, Sureshan KM. β‐Sheet to Helical‐Sheet Evolution Induced by Topochemical Polymerization: Cross‐α‐Amyloid‐like Packing in a Pseudoprotein with Gly‐Phe‐Gly Repeats. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201914975] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Kuntrapakam Hema
- School of Chemistry Indian Institute of Science Education and Research Thiruvananthapuram Kerala 695551 India
| | - Kana M. Sureshan
- School of Chemistry Indian Institute of Science Education and Research Thiruvananthapuram Kerala 695551 India
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11
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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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12
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Hema K, Gonnade RG, Sureshan KM. Crystal‐to‐Crystal Synthesis of Helically Ordered Polymers of Trehalose by Topochemical Polymerization. Angew Chem Int Ed Engl 2020; 59:2897-2903. [DOI: 10.1002/anie.201914164] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2019] [Indexed: 02/06/2023]
Affiliation(s)
- Kuntrapakam Hema
- School of ChemistryIndian Institute of Science Education and Research Thiruvananthapuram Kerala 695551 India
| | - Rajesh G. Gonnade
- Physics and Materials Chemistry DivisionNational Chemical Laboratory Pune 411008 India
| | - Kana M. Sureshan
- School of ChemistryIndian Institute of Science Education and Research Thiruvananthapuram Kerala 695551 India
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13
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Hema K, Gonnade RG, Sureshan KM. Crystal‐to‐Crystal Synthesis of Helically Ordered Polymers of Trehalose by Topochemical Polymerization. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201914164] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Kuntrapakam Hema
- School of ChemistryIndian Institute of Science Education and Research Thiruvananthapuram Kerala 695551 India
| | - Rajesh G. Gonnade
- Physics and Materials Chemistry DivisionNational Chemical Laboratory Pune 411008 India
| | - Kana M. Sureshan
- School of ChemistryIndian Institute of Science Education and Research Thiruvananthapuram Kerala 695551 India
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Campillo-Alvarado G, D'mello MM, Sinnwell MA, Höpfl H, Morales-Rojas H, MacGillivray LR. Channel Confinement of Aromatic Petrochemicals via Aryl-Perfluoroaryl Interactions With a B←N Host. Front Chem 2019; 7:695. [PMID: 31696109 PMCID: PMC6818625 DOI: 10.3389/fchem.2019.00695] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Accepted: 10/08/2019] [Indexed: 11/13/2022] Open
Abstract
We report channel confinement properties of an electron-deficient boron host derived from the orthogonal B←N interaction between a boronic ester and trans-pentafluorostilbazole. The boron host forms one-dimensional channels in the crystalline solid state when crystallized with common electron-rich aromatic petrochemicals (i.e., benzene, toluene, o-xylene) to form solvates and a cocrystal with stilbene. Molecular confinement of the electron-rich molecules in the solids is achieved through a combination of aryl-perfluoroaryl interactions (π-πF) and hydrogen bonds.
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Affiliation(s)
| | - Megan M. D'mello
- Department of Chemistry, University of Iowa, Iowa City, IA, United States
| | | | - Herbert Höpfl
- Centro de Investigaciones Químicas, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Cuernavaca, Mexico
| | - Hugo Morales-Rojas
- Centro de Investigaciones Químicas, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Cuernavaca, Mexico
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Li NY, Liu D, Lang JP. Regioselective Photochemical Cycloaddition Reactions of Diolefinic Ligands in Coordination Polymers. Chem Asian J 2019; 14:3635-3641. [PMID: 31207177 DOI: 10.1002/asia.201900646] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Revised: 06/14/2019] [Indexed: 01/26/2023]
Abstract
The pure diolefinic ligand 1,4-bis(pyridin-4-yl)-1,3-butadiene (bpbde) is photostable in the crystalline state. With the assistance of coordination-driven metal-organic assemblies, the photoreactivity of this diolefinic ligand can be significantly enhanced. A hydrothermal reaction of bpbde with Cd(NO3 )2 ⋅4 H2 O and the auxiliary ligand adipic acid resulted in the formation of a two-dimensional photoreactive coordination polymer (CP), [Cd(adipate)(bpbde)]n (1). When the aliphatic carboxylic acid was replaced by pimelic acid, another photoreactive CP [Cd(pimelate)(bpbde)]n (2) with a three-dimensional framework was obtained. With irradiation of 365 nm UV light, the bpbde ligands in crystalline 1 and 2 underwent a regioselective photochemical [2+2] cycloaddition reaction and converted to 3,4,7,8-tetra(pyridin-4-yl)tricyclo[4.2.0.02,5 ]octane (tptco) and 1,3-bis(pyridin-4-yl)-2,4-bis(2-(pyridin-4-yl)vinyl)cyclobutane (bpbpvcb), respectively. The results provide an interesting insight into the rational design of highly regio- or stereoselective photocatalytic reactions for the formation of special organic molecules.
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Affiliation(s)
- Ni-Ya Li
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, 199 RenAi Road, Suzhou, 215123, Jiangsu, P. R. China.,College of Chemistry and Materials Science, Huaibei Normal University, 100 DongShan Road, Huaibei, 235000, Anhui, P. R. China
| | - Dong Liu
- College of Chemistry and Materials Science, Huaibei Normal University, 100 DongShan Road, Huaibei, 235000, Anhui, P. R. China
| | - Jian-Ping Lang
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, 199 RenAi Road, Suzhou, 215123, Jiangsu, P. R. China
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