1
|
Poirot A, Saffon-Merceron N, Leygue N, Benoist E, Fery-Forgues S. Crystal structure of methyl 1,3-benzoxazole-2-carboxyl-ate. Acta Crystallogr E Crystallogr Commun 2021; 77:1078-1081. [PMID: 34868639 PMCID: PMC8587983 DOI: 10.1107/s2056989021010094] [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: 07/08/2021] [Accepted: 09/28/2021] [Indexed: 11/25/2022]
Abstract
The title compound, C9H7NO3, crystallizes in the monoclinic (P21) space group. In the crystal, the almost planar mol-ecules display a flattened herringbone arrangement. Stacking mol-ecules are slipped in the lengthwise and widthwise directions and are linked by π-π inter-actions [d(Cg⋯Cg = 3.6640 (11) Å]. The structure is characterized by strong C-H⋯N and weak C-H⋯O hydrogen bonds, and further stabilized by C-O⋯π inter-actions.
Collapse
Affiliation(s)
- Alexandre Poirot
- Université de Toulouse III Paul Sabatier, Laboratoire SPCMIB, UMR CNRS 5068, 118 route de Narbonne, F-31062 Toulouse, France
| | - Nathalie Saffon-Merceron
- Université de Toulouse III Paul Sabatier, Institut de Chimie de Toulouse, ICT-UAR 2599, 118, route de Narbonne, F-31062 Toulouse, France
| | - Nadine Leygue
- Université de Toulouse III Paul Sabatier, Laboratoire SPCMIB, UMR CNRS 5068, 118 route de Narbonne, F-31062 Toulouse, France
| | - Eric Benoist
- Université de Toulouse III Paul Sabatier, Laboratoire SPCMIB, UMR CNRS 5068, 118 route de Narbonne, F-31062 Toulouse, France
| | - Suzanne Fery-Forgues
- Université de Toulouse III Paul Sabatier, Laboratoire SPCMIB, UMR CNRS 5068, 118 route de Narbonne, F-31062 Toulouse, France
| |
Collapse
|
2
|
Burney‐Allen AA, Shaw J, Wheeler DL, Diodati L, Duzhko V, Tomlinson AL, Jeffries‐EL M. Benzobisoxazole Cruciforms: A Cross‐conjugated Platform for Designing Tunable Donor/Acceptor Materials. ASIAN J ORG CHEM 2020. [DOI: 10.1002/ajoc.202000502] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
| | - Jessica Shaw
- Department of Chemistry Boston University 590 Commonwealth Ave Boston MA 02215 USA
| | - David L. Wheeler
- Department of Chemistry Boston University 590 Commonwealth Ave Boston MA 02215 USA
| | - Lily Diodati
- Department of Chemistry and Biochemistry University of North Georgia 282 College Circle Dahlonega GA 30041 USA
| | - Volodimyr Duzhko
- Department of Polymer Science and Engineering University of Massachusetts – Amherst 120 Governors Drive, Conte A529 Amherst MA 01003-9263 USA
| | - Aimée L. Tomlinson
- Department of Chemistry and Biochemistry University of North Georgia 282 College Circle Dahlonega GA 30041 USA
| | - Malika Jeffries‐EL
- Department of Chemistry Boston University 590 Commonwealth Ave Boston MA 02215 USA
| |
Collapse
|
3
|
Affiliation(s)
- Ha T. M. Le
- Department of Chemistry, University of Houston, 112 Fleming
Building, Houston, Texas 77204-5003, United States
| | - Nadia S. El-Hamdi
- Department of Chemistry, University of Houston, 112 Fleming
Building, Houston, Texas 77204-5003, United States
| | - Ognjen Š. Miljanić
- Department of Chemistry, University of Houston, 112 Fleming
Building, Houston, Texas 77204-5003, United States
| |
Collapse
|
4
|
García-Rodríguez A, Rodríguez AM, Prieto P, Andreu R, Merino S, Rodríguez-López J. Swivel-Cruciform Stilbenes Based on Bithiophene. European J Org Chem 2015. [DOI: 10.1002/ejoc.201500071] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
5
|
Bon JL, Feng D, Marder SR, Blakey SB. A C–H Functionalization Protocol for the Direct Synthesis of Benzobisthiazole Derivatives. J Org Chem 2014; 79:7766-71. [DOI: 10.1021/jo501416j] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Jennifer L. Bon
- Department
of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| | - Daijun Feng
- School
of Chemistry and Biochemistry and Center for Organic Photonics and
Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Seth R. Marder
- School
of Chemistry and Biochemistry and Center for Organic Photonics and
Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Simon B. Blakey
- Department
of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| |
Collapse
|
6
|
Saeed MA, Le HTM, Miljanić OŠ. Benzobisoxazole cruciforms as fluorescent sensors. Acc Chem Res 2014; 47:2074-83. [PMID: 24779945 DOI: 10.1021/ar500099z] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
CONSPECTUS: Cross-conjugated molecular cruciforms are intriguing platforms for optoelectronic applications. Their two intersecting π-conjugated arms allow independent modulation of the molecules' HOMO and LUMO levels and guarantee a well-defined optical response to analyte binding. In addition, the rigid cross-conjugated geometries of these molecules allow their organization in two- and three-dimensional space with long-range order, making them convenient precursors for the transition from solution-based to the more practical solid-state- and surface-based devices. Not surprisingly, a number of molecular cruciform classes have been explored because of these appealing properties. These include tetrakis(arylethynyl)benzenes, tetrastyrylbenzenes, distyrylbis(arylethynyl)benzenes, tetraalkynylethenes, biphenyl-based "swivel" cruciforms, and benzobisoxazole-based cruciforms. In this Account, we summarize our group's work on benzobisoxazole molecular cruciforms. The heterocyclic central core of these molecules forces their HOMOs to localize along the vertical bisethynylbenzene axis; the HOMO localization switches to the horizontal benzobisoxazole axis only in cases when that axis bears electron-rich 4-(N,N-dimethylamino)phenyl substituents and the vertical axis does not. In contrast, the LUMOs are generally delocalized across the entire molecule, and their localization occurs only in cruciforms with donor-acceptor substitution. Such spatially isolated frontier molecular orbitals (FMOs) of the benzobisoxazole cruciforms make their response to protonation very predictable. Benzobisoxazole cruciforms are highly solvatochromic, and their fluorescence quantum yields reach 80% in nonpolar solvents. Solutions of cruciforms in different solvents change emission colors upon addition of carboxylic and boronic acid analytes. These changes are highly sensitive to the analyte structure, and the emission color responses permit qualitative discrimination among structurally closely related species. In self-assembled complexes with boronic acids, benzobisoxazole fluorophores switch their analyte preferences and become responsive to Lewis basic species: phenoxides, amines, ureas, and small organic and inorganic anions. These sensing complexes allow the decoupling of the sensor's two functions: a nonfluorescent boronic acid does the chemistry through the exchange of its labile B-O bonds for other nucleophiles, and it can be optimized for solubility and analyte specificity; the benzobisoxazole fluorophore senses the electronic changes on the boron and reports them to the operator through changes in its emission colors, allowing this sensing element to be kept constant across a broad range of analytes. We have recently expanded our studies to benzimidazole-based "half-cruciforms", which are L-shaped rigid fluorophores that maintain most of the spatial separation of FMOs observed in benzobisoxazole cruciforms. Unlike benzobisoxazoles, benzimidazoles are acidic on account of their polar N-H bonds, and this feature allows them to respond to a broader range of pH values than their benzobisoxazole counterparts. The deprotonated benzimidazolate anions maintain their fluorescence, which makes them promising candidates for incorporation into solid-state sensing materials known as zeolithic imidazolate frameworks.
Collapse
Affiliation(s)
- Musabbir A. Saeed
- Department of Chemistry, University of Houston, 112 Fleming Building, Houston, Texas 77204-5003, United States
| | - Ha T. M. Le
- Department of Chemistry, University of Houston, 112 Fleming Building, Houston, Texas 77204-5003, United States
| | - Ognjen Š. Miljanić
- Department of Chemistry, University of Houston, 112 Fleming Building, Houston, Texas 77204-5003, United States
| |
Collapse
|
7
|
Tlach BC, Tomlinson AL, Morgan KD, Collins CR, Zenner MD, Jeffries-EL M. Effect of Extended Conjugation on the Optoelectronic Properties of Benzo[1,2-d:4,5-d′]bisoxazole Polymers. Aust J Chem 2014. [DOI: 10.1071/ch13528] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Four copolymers comprising benzo[1,2-d:4,5-d']bisoxazole (BBO) and benzo[1,2-b:4,5-b′]dithiophene (BDT) bearing phenylethynyl substituents on either the BBO, BDT moieties or both units were synthesised and the influence of two-dimensional conjugation on their optoelectronic properties investigated. Extending conjugation along the BBO resulted in a 0.5 eV decrease in the LUMO level, whereas the HOMO level was raised by 0.2 eV. Extending conjugation across the BDT moiety in also resulted in a 0.5 eV decrease in the LUMO level, however, the effect was negligible on the HOMO level. Thus, cross-conjugation can be used to independently tune the LUMO level within these systems.
Collapse
|
8
|
Jo M, Lim J, Miljanić OŠ. Selective and Sensitive Fluoride Detection through Alkyne Cruciform Desilylation. Org Lett 2013; 15:3518-21. [DOI: 10.1021/ol401120a] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Minyoung Jo
- Department of Chemistry, University of Houston, 112 Fleming Building, Houston, Texas 77204-5003, United States
| | - Jaebum Lim
- Department of Chemistry, University of Houston, 112 Fleming Building, Houston, Texas 77204-5003, United States
| | - Ognjen Š. Miljanić
- Department of Chemistry, University of Houston, 112 Fleming Building, Houston, Texas 77204-5003, United States
| |
Collapse
|
9
|
Tlach BC, Tomlinson AL, Ryno AG, Knoble DD, Drochner DL, Krager KJ, Jeffries-EL M. Influence of conjugation axis on the optical and electronic properties of aryl-substituted benzobisoxazoles. J Org Chem 2013; 78:6570-81. [PMID: 23796165 DOI: 10.1021/jo4007927] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Six different 2,6-diethyl-4,8-diarylbenzo[1,2-d:4,5-d']bis(oxazoles) and four different 2,4,6,8-tetraarylbenzobisoxazoles were synthesized in two steps: a Lewis acid catalyzed orthoester cyclization followed by a Suzuki or Stille cross-coupling with various arenes. The influence of aryl group substitution and/or conjugation axis variation on the optical and electronic properties of these benzobis(oxazole) (BBO) compounds was evaluated. Structural modifications could be used to alter the HOMO, LUMO, and band gap over a range of 1.0, 0.5, and 0.5 eV, respectively. However, depending on the location and identity of the substituent, the HOMO level can be altered without significantly impacting the LUMO level. This is supported by the calculated frontier molecular orbitals. Our results indicate that the FMOs and band gaps of benzobisoxazoles can be readily modified either jointly or individually.
Collapse
Affiliation(s)
- Brian C Tlach
- Department of Chemistry, Iowa State University, Ames, Iowa 50010, USA
| | | | | | | | | | | | | |
Collapse
|
10
|
Hinderer F, Bunz UHF. The Photophysics of Pyridine-Derivatizedortho-,meta-, andpara-Dibutylamino Cruciforms. Chemistry 2013; 19:8490-6. [DOI: 10.1002/chem.201300211] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2013] [Indexed: 11/06/2022]
|
11
|
Lirag RC, Le HTM, Miljanić OŠ. L-shaped benzimidazole fluorophores: synthesis, characterization and optical response to bases, acids and anions. Chem Commun (Camb) 2013; 49:4304-6. [PMID: 23108217 DOI: 10.1039/c2cc37120k] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Rio Carlo Lirag
- University of Houston, Department of Chemistry, 136 Fleming Building, Houston, TX 77204-5003, USA
| | | | | |
Collapse
|
12
|
Martínez-Martínez V, Lim J, Bañuelos J, López-Arbeloa I, Miljanić OŠ. Strong intramolecular charge transfer emission in benzobisoxazole cruciforms: solvatochromic dyes as polarity indicators. Phys Chem Chem Phys 2013; 15:18023-9. [DOI: 10.1039/c3cp53527d] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
|
13
|
Tasior M, Hugues V, Blanchard‐Desce M, Gryko DT. Benzo[1,2‐
d
:4,5‐
d
′]bisimidazoles as a Convenient Platform Towards Dyes that are Capable of Excited‐State Intramolecular Proton Transfer and of Two‐Photon Absorption. Chem Asian J 2012; 7:2656-61. [DOI: 10.1002/asia.201200539] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2012] [Indexed: 01/25/2023]
Affiliation(s)
- Mariusz Tasior
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01‐224 Warsaw (Poland), Fax: (+48) 226326681
| | - Vincent Hugues
- Université de Bordeaux, ISM (UMR5255 CNRS), F 33400, Bordeaux (France)
| | | | - Daniel T. Gryko
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01‐224 Warsaw (Poland), Fax: (+48) 226326681
- Warsaw University of Technology, Faculty of Chemistry, Noakowskiego 3, 00‐664 Warsaw (Poland)
| |
Collapse
|
14
|
Lim J, Osowska K, Armitage JA, Martin BR, Miljanić OŠ. Critical role of weak [C–H⋯O] hydrogen bonds in the assembly of benzo[1,2-d:4,5-d′]bisoxazole cruciforms into supramolecular sheets. CrystEngComm 2012. [DOI: 10.1039/c2ce25485a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
15
|
Lim J, Nam D, Miljanić OŠ. Identification of carboxylic and organoboronic acids and phenols with a single benzobisoxazole fluorophore. Chem Sci 2012. [DOI: 10.1039/c1sc00610j] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
|
16
|
Lim J, Miljanić OŠ. Benzobisoxazole fluorophore vicariously senses amines, ureas, anions. Chem Commun (Camb) 2012; 48:10301-3. [PMID: 22983092 DOI: 10.1039/c2cc35626k] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Jaebum Lim
- University of Houston, Department of Chemistry, 136 Fleming Building, Houston, TX 77204-5003, USA
| | | |
Collapse
|
17
|
|
18
|
Lim J, Albright TA, Martin BR, Miljanić OŠ. Benzobisoxazole Cruciforms: Heterocyclic Fluorophores with Spatially Separated Frontier Molecular Orbitals. J Org Chem 2011; 76:10207-19. [PMID: 22077919 DOI: 10.1021/jo202107w] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jaebum Lim
- Department of Chemistry, University of Houston, 136 Fleming Building, Houston, Texas 77204-5003,
United States
| | - Thomas A. Albright
- Department of Chemistry, University of Houston, 136 Fleming Building, Houston, Texas 77204-5003,
United States
| | - Benjamin R. Martin
- Department
of Chemistry, Texas State University—San Marcos, 601 University Drive, San Marcos, Texas 78666,
United States
| | - Ognjen Š. Miljanić
- Department of Chemistry, University of Houston, 136 Fleming Building, Houston, Texas 77204-5003,
United States
| |
Collapse
|
19
|
Tlach BC, Tomlinson AL, Bhuwalka A, Jeffries-EL M. Tuning the Optical and Electronic Properties of 4,8-Disubstituted Benzobisoxazoles via Alkyne Substitution. J Org Chem 2011; 76:8670-81. [DOI: 10.1021/jo201078w] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Brian C. Tlach
- Department of Chemistry, Iowa State University, Ames, Iowa 50010, United States
| | - Aimée L. Tomlinson
- Department of Chemistry, North Georgia College & State University, Dahlonega, Georgia 30597, United States
| | - Achala Bhuwalka
- Department of Chemistry, Iowa State University, Ames, Iowa 50010, United States
| | - Malika Jeffries-EL
- Department of Chemistry, Iowa State University, Ames, Iowa 50010, United States
| |
Collapse
|
20
|
Inouchi T, Nakashima T, Toba M, Kawai T. Preparation and Acid-Responsive Photophysical Properties of T-Shaped π-Conjugated Molecules Containing a Benzimidazole Junction. Chem Asian J 2011; 6:3020-7. [DOI: 10.1002/asia.201100401] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2011] [Indexed: 11/11/2022]
|
21
|
Affiliation(s)
- Rafael Chinchilla
- Departamento de Química Orgánica, Facultad de Ciencias and Instituto de Síntesis Orgánica (ISO), Universidad de Alicante, Apartado 99, 03080 Alicante, Spain.
| | | |
Collapse
|