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Le Thi Hong H, Le Phuong T, Van Pham T, Minh Thi Nguyen H, Van Meervelt L. Unusual reaction of ( E)-2-[(benzo[ d]thia-zol-2-yl-imino)-meth-yl]-5-(di-ethyl-amino)-phenol with tri-phenyl-borane: crystal structures and optical properties. Acta Crystallogr E Crystallogr Commun 2023; 79:982-987. [PMID: 37936854 PMCID: PMC10626958 DOI: 10.1107/s2056989023008514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Accepted: 09/27/2023] [Indexed: 11/09/2023]
Abstract
The mol-ecular and crystal structure of (E)-2-[(benzo[d]thia-zol-2-yl-imino)-meth-yl]-5-(di-ethyl-amino)-phenol (C18H19N3O2S, Et2N-Bz) and its unexpected reaction product with tri-phenyl-borane, 2,2-diphenyl-1,3-dioxa-2-borata-1,2-di-hydro-naphthalene [systematic name: N,N-diethyl-2,2-diphenyl-2H-1,3λ3,2λ4-ben-zodioxaborinin-7-amine, C23H24BNO2, (I)] are described. For Et2N-Bz, the hydroxyl group is involved in an intra-molecular hydrogen bond with the imino nitro-gen atom and the C=N bond displays an E configuration. The crystal packing is characterized by layers of inversion dimers parallel to the (10) plane and chains of mol-ecule in the a-axis direction formed through C-H⋯O inter-actions. Complex (I) crystallizes with two mol-ecules (A and B) in the asymmetric unit, which differ in the orientation of the ethyl groups. The 1,3-dioxa-2-borata-1,2,3,4-tetra-hydro-naphthalene ring displays a slight envelope conformation with the boron atom as the flap. In the crystal packing, chains of alternating A and B mol-ecules formed by C-H⋯O hydrogen bonds run in the b-axis direction. The UV-vis absorption and emission properties of the compounds are discussed and their aggregation-induced emission properties are further investigated.
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Affiliation(s)
- Hai Le Thi Hong
- Department of Chemistry, Hanoi National University of Education, 136 Xuan Thuy, Cau Giay, Hanoi, Vietnam
| | - Thao Le Phuong
- Department of Chemistry, Hanoi National University of Education, 136 Xuan Thuy, Cau Giay, Hanoi, Vietnam
| | - Thong Van Pham
- Department of Chemistry, Hanoi National University of Education, 136 Xuan Thuy, Cau Giay, Hanoi, Vietnam
| | - Hue Minh Thi Nguyen
- Department of Chemistry, Hanoi National University of Education, 136 Xuan Thuy, Cau Giay, Hanoi, Vietnam
| | - Luc Van Meervelt
- Department of Chemistry, KU Leuven, Biomolecular Architecture, Celestijnenlaan 200F, Leuven (Heverlee), B-3001, Belgium
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Macé A, Hamrouni K, Matozzo P, Coehlo M, Firlej J, Aloui F, Vanthuyne N, Caytan E, Cordier M, Pieters G, Srebro-Hooper M, Berrée F, Carboni B, Crassous J. Synthesis, structural characterization, and chiroptical properties of planarly and axially chiral boranils. Chirality 2023; 35:227-246. [PMID: 36735567 DOI: 10.1002/chir.23537] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Revised: 01/17/2023] [Accepted: 01/18/2023] [Indexed: 02/04/2023]
Abstract
2-Amino[2.2]paracyclophane reacts with salicylaldehyde or 2-hydroxyacetophenone to yield imines that then give access to a new series of boranils (8b-d) upon complexation with BF2 . These novel boron-containing compounds display both planar and axial chiralities and were examined experimentally and computationally. In particular, their photophysical and chiroptical properties were studied and compared to newly prepared, simpler boranils (9a-d) exhibiting axial chirality only. Less sophisticated chiral architectures were shown to demonstrate overall stronger circularly polarized luminescence (CPL) activity.
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Affiliation(s)
- Aurélie Macé
- Université de Rennes, CNRS, ISCR-UMR 6226, ScanMAT-UMS 2001, Rennes, France
| | - Khaoula Hamrouni
- Université de Rennes, CNRS, ISCR-UMR 6226, ScanMAT-UMS 2001, Rennes, France.,Laboratory of Asymmetric Synthesis and Molecular Engineering of Organic Materials for Organic Electronics (LR18ES19), Faculty of Sciences, Avenue of Environment, University of Monastir, Monastir, Tunisia
| | - Paola Matozzo
- Université de Rennes, CNRS, ISCR-UMR 6226, ScanMAT-UMS 2001, Rennes, France
| | - Max Coehlo
- Département Médicaments et Technologies pour la Santé (DMTS), SCBM, Université Paris-Saclay, CEA, Gif-sur-Yvette, France
| | - Jakub Firlej
- Faculty of Chemistry, Jagiellonian University, Krakow, Poland
| | - Faouzi Aloui
- Laboratory of Asymmetric Synthesis and Molecular Engineering of Organic Materials for Organic Electronics (LR18ES19), Faculty of Sciences, Avenue of Environment, University of Monastir, Monastir, Tunisia
| | - Nicolas Vanthuyne
- Aix Marseille University, CNRS, Centrale Marseille, iSm2, Marseille, France
| | - Elsa Caytan
- Université de Rennes, CNRS, ISCR-UMR 6226, ScanMAT-UMS 2001, Rennes, France
| | - Marie Cordier
- Université de Rennes, CNRS, ISCR-UMR 6226, ScanMAT-UMS 2001, Rennes, France
| | - Grégory Pieters
- Département Médicaments et Technologies pour la Santé (DMTS), SCBM, Université Paris-Saclay, CEA, Gif-sur-Yvette, France
| | | | - Fabienne Berrée
- Université de Rennes, CNRS, ISCR-UMR 6226, ScanMAT-UMS 2001, Rennes, France
| | - Bertrand Carboni
- Université de Rennes, CNRS, ISCR-UMR 6226, ScanMAT-UMS 2001, Rennes, France
| | - Jeanne Crassous
- Université de Rennes, CNRS, ISCR-UMR 6226, ScanMAT-UMS 2001, Rennes, France
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Veerabhadraswamy BN, Khatavi SY, Rathod AS, Kanakala MB, Rao DSS, Yelamaggad CV. Tris(boranil) Columnar Liquid Crystalline Fluorophores: pseudo-Triphenylene Boron(III) Complexes with Peripheral N-B-O Linkages. Chemistry 2023; 29:e202202987. [PMID: 36609858 DOI: 10.1002/chem.202202987] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Revised: 01/05/2023] [Accepted: 01/06/2023] [Indexed: 01/09/2023]
Abstract
The borate complexes derived from salicylaldimine ligands, called boranils, possess a wide range of photophysical and electronic characteristics intrinsically. The unique combination of molecular rigidity, rendered by four-coordinate boron bridges, and extended π-conjugation enable them to serve as technically feasible fluorescent materials (dyes). The incorporation of liquid crystallinity in these boron(III) complexes, especially the columnar (Col) mesomorphism, which is overlooked hitherto, would provide a new dimension to these complexes. Herein, we report the first examples of tris(boranil) discotic liquid crystal (LC) dyes that have been readily synthesized by treating tris(N-salicylideneaniline)s, (TSAN)s, with BF3 .Et2 O in the presence of an acid quencher. These C3 -symmetric borate complexes self-assemble into the Col phase, existing over a wide thermal span including room temperature. The 2D periodic order of the Col phases shows dependence on the length of the peripheral tails. The photophysical measurements reveal the fluorescence emission in their two condensed states viz., solid and Col phase, and in solution. Their electrochemical, two-step oxidation process coupled with the aforesaid features upholds their significance in applied research.
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Affiliation(s)
- B N Veerabhadraswamy
- Centre for Nano and Soft Matter Sciences (CeNS), Arkavathi, Survey No.7, Shivanapura, Dasanapura Hobli, Bengaluru, 562162, India
| | - Santosh Y Khatavi
- Centre for Nano and Soft Matter Sciences (CeNS), Arkavathi, Survey No.7, Shivanapura, Dasanapura Hobli, Bengaluru, 562162, India
| | - Anil S Rathod
- Centre for Nano and Soft Matter Sciences (CeNS), Arkavathi, Survey No.7, Shivanapura, Dasanapura Hobli, Bengaluru, 562162, India
| | - Madhu Babu Kanakala
- Centre for Nano and Soft Matter Sciences (CeNS), Arkavathi, Survey No.7, Shivanapura, Dasanapura Hobli, Bengaluru, 562162, India
| | - D S Shankar Rao
- Centre for Nano and Soft Matter Sciences (CeNS), Arkavathi, Survey No.7, Shivanapura, Dasanapura Hobli, Bengaluru, 562162, India
| | - Channabasaveshwar V Yelamaggad
- Centre for Nano and Soft Matter Sciences (CeNS), Arkavathi, Survey No.7, Shivanapura, Dasanapura Hobli, Bengaluru, 562162, India
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Four-Coordinate Monoboron Complexes with 8-Hydroxyquinolin-5-Sulfonate: Synthesis, Crystal Structures, Theoretical Studies, and Luminescence Properties. CRYSTALS 2022. [DOI: 10.3390/cryst12060783] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
8-Hydroxyquinolin-5-sulfonic acid (8HQSA) was combined with 3-pyridineboronic acid (3PBA) or 4-pyridineboronic acid (4PBA) to give two zwitterionic monoboron complexes in crystalline form. The compounds were characterized by elemental analysis, single-crystal X-ray diffraction studies, and IR, 1H NMR, UV-Visible, and luminescence spectroscopy. The analyses revealed compounds with boron atoms adopting tetrahedral geometry. In the solid state, the molecular components are linked by charge-assisted (B)(O-H···−O(S) and N+-H···O(S) hydrogen bonds aside from C-H···O contacts and π···π interactions, as shown by Hirshfeld surface analyses and 2D fingerprint plots. The luminescence properties were characterized in terms of the emission behavior in solution and the solid state, showing emission in the bluish-green region in solution and large positive solvatofluorochromism, caused by intramolecular charge transfer. According to TD-DFT calculations at the M06-2X/6-31G(d) level of theory simulating an ethanol solvent environment, the emission properties are originated from π-π * and n-π * HOMO-LUMO transitions.
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Mukundam V, Sa S, Kumari A, Ponduru TT, Das R, Venkatasubbaiah K. Synthesis, photophysical, electrochemical, and non-linear optical properties of triaryl pyrazole based B-N coordinated boron compounds. Chem Asian J 2022; 17:e202200291. [PMID: 35452174 DOI: 10.1002/asia.202200291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Revised: 04/19/2022] [Indexed: 11/10/2022]
Abstract
We report here a set of triaryl pyrazole based B-N coordinated boron compounds ( 11 - 17 ) synthesized by electrophilic aromatic borylation strategy. All the pyrazole boron compounds were thoroughly characterized using multinuclear NMR spectroscopy, LCMS, and single crystal X-ray diffraction analysis (for 12 - 17 ). The photoluminescence measurements of 11 - 17 revealed that the emission peak maxima were tuned based on the substitution on Nphenyl. The photophysical and electrochemical properties were further supported by theoretical calculations. Z-scan based investigations at 515 nm pump wavelength showed that B-N coordination led to enhancement of nonlinear absorption (two-photon absorption (TPA)) in these compounds if an electron deficient moiety is attached. It has also been observed that an appropriate choice of moiety allows to optimally maneuver the molecular polarizability of the π-system and consequently, assists in controlling the third-order nonlinear optical response.
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Affiliation(s)
- Vanga Mukundam
- National Institute of Science Education and Research, School of Chemical Sciences, INDIA
| | - Shreenibasa Sa
- National Institute of Science Education and Research, School of Chemical Sciences, INDIA
| | - Anupa Kumari
- National Institute of Science Education and Research, School of Physical Sciences, INDIA
| | - Tharun Teja Ponduru
- National Institute of Science Education and Research, School of Chemical Sciences, INDIA
| | - Ritwick Das
- National Institute of Science Education and Research, School of Physical Sciences, INDIA
| | - Krishnan Venkatasubbaiah
- National Institute of Science Education and Research, School of Chemical Sciences, NISER, 752050, Bhubaneswar, INDIA
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Murali AC, Nayak P, Venkatasubbaiah K. Recent advances in the synthesis of luminescent tetra-coordinated boron compounds. Dalton Trans 2022; 51:5751-5771. [PMID: 35343524 DOI: 10.1039/d2dt00160h] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Tetra-coordinated boron compounds offer a plethora of luminescent materials. Different chelation around the boron center (O,O-, N,C-, N,O-, and N,N-) has been explored to tune the electronic and photophysical properties of tetra-coordinated boron compounds. A number of fascinating molecules with interesting properties such as aggregation induced emission, mechanochromism and tunable emission by changing the solvent polarity were realised. Owing to their rich and unique properties, some of the molecules have shown applications in making optoelectronic devices, probes and so on. This perspective provides an overview of the recent developments of tetra-coordinated boron compounds and their potential applications.
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Affiliation(s)
- Anna Chandrasekar Murali
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), an OCC of Homi Bhabha National Institute, Bhubaneswar-752050, Odisha, India.
| | - Prakash Nayak
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), an OCC of Homi Bhabha National Institute, Bhubaneswar-752050, Odisha, India.
| | - Krishnan Venkatasubbaiah
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), an OCC of Homi Bhabha National Institute, Bhubaneswar-752050, Odisha, India.
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