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Bould J, Ehn M, Tok O, Bavol D, Kučeráková M, Clegg W, Litecká M, Lang K, Kirakci K, Londesborough MGS. Expanding Luminescence Horizons in Macropolyhedral Heteroboranes. Angew Chem Int Ed Engl 2024; 63:e202401872. [PMID: 38400832 DOI: 10.1002/anie.202401872] [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: 01/26/2024] [Revised: 02/21/2024] [Accepted: 02/23/2024] [Indexed: 02/26/2024]
Abstract
Luminescence is observed in three novel macropolyhedral nineteen- and eighteen-vertex chalcogenaboranes: Se2B17H17 (1), SeB17H19 (3) and SeB18H20 (4). This led us to the recognition that previously published macropolyhedral heteroborane species might also exhibit luminescence. Thus, the known nineteen- and eighteen-vertex dithiaboranes S2B17H17 (2), n-S2B16H16 (5) and i-S2B16H16 (6) were synthesised and also found to exhibit a range of luminescent properties. These macropolyhedral species are very different from the previously unique fluorescent binary borane B18H22 in terms of their structural architectures, by the presence of borane cluster hetero atoms, and, as in the cases of 5 and 6, that their synthetic origins are not derived simply through the modification of B18H22 itself. They consequently greatly expand the possibilities of finding new luminescent inorganic borane species.
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Affiliation(s)
- Jonathan Bould
- Institute of Inorganic Chemistry of the Czech Academy of Sciences, Husinec-Řež, 250 68, Czech Republic
| | - Marcel Ehn
- Institute of Inorganic Chemistry of the Czech Academy of Sciences, Husinec-Řež, 250 68, Czech Republic
| | - Oleg Tok
- Institute of Inorganic Chemistry of the Czech Academy of Sciences, Husinec-Řež, 250 68, Czech Republic
| | - Dmytro Bavol
- Institute of Inorganic Chemistry of the Czech Academy of Sciences, Husinec-Řež, 250 68, Czech Republic
| | - Monika Kučeráková
- Institute of Physics of the Czech Academy of Sciences, Cukrovarnická 10, 162 00, Prague 6, Czech Republic
| | - William Clegg
- Chemistry, School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK
| | - Miroslava Litecká
- Institute of Inorganic Chemistry of the Czech Academy of Sciences, Husinec-Řež, 250 68, Czech Republic
| | - Kamil Lang
- Institute of Inorganic Chemistry of the Czech Academy of Sciences, Husinec-Řež, 250 68, Czech Republic
| | - Kaplan Kirakci
- Institute of Inorganic Chemistry of the Czech Academy of Sciences, Husinec-Řež, 250 68, Czech Republic
| | - Michael G S Londesborough
- Institute of Inorganic Chemistry of the Czech Academy of Sciences, Husinec-Řež, 250 68, Czech Republic
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2
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Bould J, Londesborough MGS, Brus J, Tok O, Sanz Miguel PJ, Macías R. Simple Route to [PSH][B 9H 14] and a Contemporary Study of Its Solid-State Dynamic Behavior. Inorg Chem 2023; 62:14568-14579. [PMID: 37647567 DOI: 10.1021/acs.inorgchem.3c01665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
Abstract
The 1,8-bis(dimethylamino)naphthalenium ([PSH]+) decaborane salt, [PSH][B10H13], has been found to react in ethanol to form [PSH][B9H14] (1), affording a simple route to the synthesis of the arachno-nonaborate anion. This new polyhedral salt is characterized by NMR spectroscopy and X-ray diffraction. The measurement of diffusion coefficients by NMR methods demonstrates that the [PSH]+ cation and the [B9H14]- anion form ion pairs in a non-coordinating solvent such as CH2Cl2, whereas in CD3CN the formation of ion pairs was not observed. Insights into the long-known low-energy dynamic behavior, which involves the bridging and endo-terminal hydrogen atoms, are elucidated using DFT calculations. Salts [PSH][B9H14] (1) and [PSH][B9H14]·0.5CHCl3 (solvated, 1·0.5CHCl3) have also been studied by X-ray diffraction analysis. A solid-state NMR study has demonstrated that K[B9H14] and [PSH][B9H14] (1) undergo significantly different motion regimes, being a low-energy, weakly temperature-dependent process for 1, which may be ascribed to some type of low-amplitude reorientation of the whole boron cages. This process may be the mechanism for the low- to-room-temperature order-disorder hidden transition found by X-ray analysis.
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Affiliation(s)
- Jonathan Bould
- Institute of Inorganic Chemistry, Czech Academy of Sciences, Husinec-Řež 250 68, Czech Republic
| | | | - Jiři Brus
- Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovskéhonám. 2, Prague 162 00, Czech Republic
| | - Oleg Tok
- Institute of Inorganic Chemistry, Czech Academy of Sciences, Husinec-Řež 250 68, Czech Republic
| | - Pablo J Sanz Miguel
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain
| | - Ramón Macías
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain
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3
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Sivaev IB. Decaborane: From Alfred Stock and Rocket Fuel Projects to Nowadays. Molecules 2023; 28:6287. [PMID: 37687117 PMCID: PMC10488552 DOI: 10.3390/molecules28176287] [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: 08/02/2023] [Revised: 08/21/2023] [Accepted: 08/24/2023] [Indexed: 09/10/2023] Open
Abstract
The review covers more than a century of decaborane chemistry from the first synthesis by Alfred Stock to the present day. The main attention is paid to the reactions of the substitution of hydrogen atoms by various atoms and groups with the formation of exo-polyhedral boron-halogen, boron-oxygen, boron-sulfur, boron-nitrogen, boron-phosphorus, and boron-carbon bonds. Particular attention is paid to the chemistry of conjucto-borane anti-[B18H22], whose structure is formed by two decaborane moieties with a common edge, the chemistry of which has been intensively developed in the last decade.
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Affiliation(s)
- Igor B Sivaev
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilov Str., 119334 Moscow, Russia
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4
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Patel D, Sooraj BS, Kirakci K, Macháček J, Kučeráková M, Bould J, Dušek M, Frey M, Neumann C, Ghosh S, Turchanin A, Pradeep T, Base T. Macropolyhedral syn-B 18H 22, the "Forgotten" Isomer. J Am Chem Soc 2023; 145:17975-17986. [PMID: 37532522 PMCID: PMC10436279 DOI: 10.1021/jacs.3c05530] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Indexed: 08/04/2023]
Abstract
The chemistry and physics of macropolyhedral B18H22 clusters have attracted significant attention due to the interesting photophysical properties of anti-B18H22 (blue emission, laser properties) and related potential applications. We have focused our attention on the "forgotten" syn-B18H22 isomer, which has received very little attention since its discovery compared to its anti-B18H22 isomer, presumably because numerous studies have reported this isomer as nonluminescent. In our study, we show that in crystalline form, syn-B18H22 exhibits blue fluorescence and becomes phosphorescent when substituted at various positions on the cluster, associated with peculiar microstructural-dependent effects. This work is a combined theoretical and experimental investigation that includes the synthesis, separation, structural characterization, and first elucidation of the photophysical properties of three different monothiol-substituted cluster isomers, [1-HS-syn-B18H21] 1, [3-HS-syn-B18H21] 3, and [4-HS-syn-B18H21] 4, of which isomers 1 and 4 have been proved to exist in two different polymorphic forms. All of these newly substituted macropolyhedral cluster derivatives (1, 3, and 4) have been fully characterized by NMR spectroscopy, mass spectrometry, single-crystal X-ray diffraction, IR spectroscopy, and luminescence spectroscopy. This study also presents the first report on the mechanochromic shift in the luminescence of a borane cluster and generally enriches the area of rather rare boron-based luminescent materials. In addition, we present the first results proving that they are useful constituents of carbon-free self-assembled monolayers.
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Affiliation(s)
- Deepak
Kumar Patel
- DST
Unit of Nanoscience (DST UNS) and Thematic Unit of Excellence (TUE),
Department of Chemistry, Indian Institute
of Technology, Madras, Chennai 600036, India
- Institute
of Inorganic Chemistry, The Czech Academy
of Science, 25068 Rez, Czech Republic
| | - B. S. Sooraj
- DST
Unit of Nanoscience (DST UNS) and Thematic Unit of Excellence (TUE),
Department of Chemistry, Indian Institute
of Technology, Madras, Chennai 600036, India
- Institute
of Inorganic Chemistry, The Czech Academy
of Science, 25068 Rez, Czech Republic
| | - Kaplan Kirakci
- Institute
of Inorganic Chemistry, The Czech Academy
of Science, 25068 Rez, Czech Republic
| | - Jan Macháček
- Institute
of Inorganic Chemistry, The Czech Academy
of Science, 25068 Rez, Czech Republic
| | - Monika Kučeráková
- Institute
of Physics, The Czech Academy of Science, 182 21 Prague 8, Czech Republic
| | - Jonathan Bould
- Institute
of Inorganic Chemistry, The Czech Academy
of Science, 25068 Rez, Czech Republic
| | - Michal Dušek
- Institute
of Physics, The Czech Academy of Science, 182 21 Prague 8, Czech Republic
| | - Martha Frey
- Institute
of Physical Chemistry Friedrich Schiller University Jena, 07743 Jena, Germany
| | - Christof Neumann
- Institute
of Physical Chemistry Friedrich Schiller University Jena, 07743 Jena, Germany
| | - Sundargopal Ghosh
- DST
Unit of Nanoscience (DST UNS) and Thematic Unit of Excellence (TUE),
Department of Chemistry, Indian Institute
of Technology, Madras, Chennai 600036, India
| | - Andrey Turchanin
- Institute
of Physical Chemistry Friedrich Schiller University Jena, 07743 Jena, Germany
| | - Thalappil Pradeep
- DST
Unit of Nanoscience (DST UNS) and Thematic Unit of Excellence (TUE),
Department of Chemistry, Indian Institute
of Technology, Madras, Chennai 600036, India
| | - Tomas Base
- Institute
of Inorganic Chemistry, The Czech Academy
of Science, 25068 Rez, Czech Republic
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5
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Ehn M, Bavol D, Bould J, Strnad V, Litecká M, Lang K, Kirakci K, Clegg W, Waddell PG, Londesborough MGS. A Window into the Workings of anti-B 18H 22 Luminescence-Blue-Fluorescent Isomeric Pair 3,3'-Cl 2-B 18H 20 and 3,4'-Cl 2-B 18H 20 (and Others). Molecules 2023; 28:molecules28114505. [PMID: 37298983 DOI: 10.3390/molecules28114505] [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: 05/03/2023] [Revised: 05/30/2023] [Accepted: 05/30/2023] [Indexed: 06/12/2023] Open
Abstract
The action of AlCl3 on room-temperature tetrachloromethane solutions of anti-B18H22 (1) results in a mixture of fluorescent isomers, 3,3'-Cl2-B18H20 (2) and 3,4'-Cl2-B18H20 (3), together isolated in a 76% yield. Compounds 2 and 3 are capable of the stable emission of blue light under UV-excitation. In addition, small amounts of other dichlorinated isomers, 4,4'-Cl2-B18H20 (4), 3,1'-Cl2-B18H20 (5), and 7,3'-Cl2-B18H20 (6) were isolated, along with blue-fluorescent monochlorinated derivatives, 3-Cl-B18H21 (7) and 4-Cl-B18H21 (8), and trichlorinated species 3,4,3'-Cl3-B18H19 (9) and 3,4,4'-Cl3-B18H19 (10). The molecular structures of these new chlorinated derivatives of octadecaborane are delineated, and the photophysics of some of these species are discussed in the context of the influence that chlorination bears on the luminescence of anti-B18H22. In particular, this study produces important information on the effect that the cluster position of these substitutions has on luminescence quantum yields and excited-state lifetimes.
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Affiliation(s)
- Marcel Ehn
- Institute of Inorganic Chemistry of the Czech Academy of Sciences, 250 68 Řež, Czech Republic
| | - Dmytro Bavol
- Institute of Inorganic Chemistry of the Czech Academy of Sciences, 250 68 Řež, Czech Republic
| | - Jonathan Bould
- Institute of Inorganic Chemistry of the Czech Academy of Sciences, 250 68 Řež, Czech Republic
| | - Vojtěch Strnad
- Institute of Inorganic Chemistry of the Czech Academy of Sciences, 250 68 Řež, Czech Republic
- Department of Physical Chemistry, University of Chemistry and Technology in Prague, Technická 5, Dejvice, 166 28 Prague, Czech Republic
| | - Miroslava Litecká
- Institute of Inorganic Chemistry of the Czech Academy of Sciences, 250 68 Řež, Czech Republic
| | - Kamil Lang
- Institute of Inorganic Chemistry of the Czech Academy of Sciences, 250 68 Řež, Czech Republic
| | - Kaplan Kirakci
- Institute of Inorganic Chemistry of the Czech Academy of Sciences, 250 68 Řež, Czech Republic
| | - William Clegg
- Chemistry, School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne NE1 7RU, UK
| | - Paul G Waddell
- Chemistry, School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne NE1 7RU, UK
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Bould J, Tok O, Clegg W, Londesborough MG, Litecká M, Ehn M. The Metal-Mediated Coupling of the Diselenaundecaborate Anion [Se2B9H10]−. Inorganica Chim Acta 2022. [DOI: 10.1016/j.ica.2022.121341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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7
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Capkova T, Hanulikova B, Sevcik J, Urbanek P, Antos J, Urbanek M, Kuritka I. Incorporation of the New anti-Octadecaborane Laser Dyes into Thin Polymer Films: A Temperature-Dependent Photoluminescence and Infrared Spectroscopy Study. Int J Mol Sci 2022; 23:ijms23158832. [PMID: 35955965 PMCID: PMC9368784 DOI: 10.3390/ijms23158832] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Revised: 08/03/2022] [Accepted: 08/04/2022] [Indexed: 11/16/2022] Open
Abstract
New anti-octadecaborane(22) laser dyes have been recently introduced. However, their application in solid thin films is limited, despite being very desirable for electronics. Spectroscopic methods, photoluminescence (PL), and infrared reflection-absorption spectroscopy (IRRAS), are here used to reveal structural responses to a temperature change in thin polymer films made of π- and σ-conjugated and non-conjugated polymers and anti-octadecaborane(22) and its tetra-alkylatedderivatives. It has been observed that borane clusters are not firmly fixed within polymer matrices and that their ability for diffusion out of the polymer film is unprecedented, especially at higher temperatures. This ability is related to thermodynamic transitions of polymer macromolecular chains. PL and IRRAS spectra have revealed a clear correlation with β-transition and α-transition of polymers. The influence of structure and molecular weight of a polymer and the concentration and the substitution type of clusters on mobility of borane clusters within the polymer matrix is demonstrated. A solution is proposed that led to an improvement of the temperature stability of films by 45 °C. The well-known spectroscopic methods have proved to be powerful tools for a non-routine description of the temperature behavior of both borane clusters and polymer matrices.
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8
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Demel J, Kloda M, Lang K, Škoch K, Hynek J, Opravil A, Novotný M, Bould J, Ehn M, Londesborough MGS. Direct Phenylation of nido-B 10H 14. J Org Chem 2022; 87:10034-10043. [PMID: 35839127 DOI: 10.1021/acs.joc.2c00997] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
As a preliminary step toward its condensation into the porous polymer Activated Borane, the thermolysis of nido-B10H14 (1) in benzene at 200 °C results in the generation of a number of phenylated borane molecular species. The principal product is the new monophenylated compound 5-Ph-nido-B10H13 (2), isolated in 48% yield (based on consumption of 1) and structurally characterized by single-crystal X-ray diffraction analysis, NMR, and mass spectrometry along with other minor products, such as 6-Ph-nido-B10H13 (3), for which we observe UV-light-driven conversion into 2 via a "vertex-flip" mechanism, and novel diphenylated 5,8-Ph2-nido-B10H12 (4). Together, the phenylated derivatives provide a valuable insight into the assembly of Activated Borane and ultimately inform on its structure. The new compounds also display strong blue fluorescence in both solid-state and in solution and are the first examples of the direct phenylation of nido-B10H14, thus opening the door to the straight-forward synthesis of highly luminescent organic-borane hybrid systems.
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Affiliation(s)
- Jan Demel
- Institute of Inorganic Chemistry of the Czech Academy of Sciences 250 68, Husinec-Řež č.p. 1001, Czech Republic
| | - Matouš Kloda
- Institute of Inorganic Chemistry of the Czech Academy of Sciences 250 68, Husinec-Řež č.p. 1001, Czech Republic
| | - Kamil Lang
- Institute of Inorganic Chemistry of the Czech Academy of Sciences 250 68, Husinec-Řež č.p. 1001, Czech Republic
| | - Karel Škoch
- Institute of Inorganic Chemistry of the Czech Academy of Sciences 250 68, Husinec-Řež č.p. 1001, Czech Republic
| | - Jan Hynek
- Institute of Inorganic Chemistry of the Czech Academy of Sciences 250 68, Husinec-Řež č.p. 1001, Czech Republic
| | - Adam Opravil
- Institute of Inorganic Chemistry of the Czech Academy of Sciences 250 68, Husinec-Řež č.p. 1001, Czech Republic
| | - Matyáš Novotný
- Institute of Inorganic Chemistry of the Czech Academy of Sciences 250 68, Husinec-Řež č.p. 1001, Czech Republic
| | - Jonathan Bould
- Institute of Inorganic Chemistry of the Czech Academy of Sciences 250 68, Husinec-Řež č.p. 1001, Czech Republic
| | - Marcel Ehn
- Institute of Inorganic Chemistry of the Czech Academy of Sciences 250 68, Husinec-Řež č.p. 1001, Czech Republic
| | - Michael G S Londesborough
- Institute of Inorganic Chemistry of the Czech Academy of Sciences 250 68, Husinec-Řež č.p. 1001, Czech Republic
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9
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Haridas A, Bedajna S, Ghosh S. Substitution at B-H vertices of group 5 metallaborane clusters. J Organomet Chem 2022. [DOI: 10.1016/j.jorganchem.2021.122250] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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10
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Bould J, Londesborough MGS, Litecká M, Macías R, Shea SL, McGrath TD, Clegg W, Kennedy JD. Macropolyhedral Chalcogenaboranes: Insertion of Selenium into the Isomers of B 18H 22. Inorg Chem 2022; 61:1899-1917. [PMID: 35049289 DOI: 10.1021/acs.inorgchem.1c03018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
High yields of novel macropolyhedral selenaboranes are reported. Reactions of the monoanions of the syn- and anti-isomers of B18H22 with powdered selenium in THF variously give new macropolyhedral selenaboranes: 19-vertex [SeB18H19]- anion 1, 19-vertex [SeB18H21]- anion 2, 20-vertex [Se2B18H19]- anion 3, and 19-vertex [Se2B17H18]- anion 4. Single-cluster [hypho-Se2B6H9]- anion 5 and neutral arachno-Se2B7H9 6 also result. All of the macropolyhedrals 1, 2, 3, and 4 are characterized by NMR spectroscopy and mass spectrometry, and by single-crystal X-ray diffraction analyses. Anions 1 and 2 each consist of an 11-vertex subcluster joined by a common two-boron edge to a 10-vertex subcluster. Anion 3 consists of an 11-vertex subcluster joined by a common boron atom and an interboron link to an arachno-type 10-vertex subcluster. Unusually, anion 3 incorporates a hexagonal pyramidal intracluster structural motif in its 11-vertex subcluster. Anion 4 entails two arachno-type 10-vertex subclusters joined by a common boron atom, and with an additional intercluster boron-boron link. NMR data for syn-B18H22 and its mono- and dianions 7 and 8 and single-crystal X-ray diffraction results for these anions and also the monoanion 9 of anti-B18H22 are also reported. The oxaborane [μ-(8,9)-O-syn-B18H20]2- dianion 10 was serendipitously formed during the work and also characterized by a single-crystal X-ray diffraction study. Experimental NMR and structural findings are supported by DFT calculations throughout.
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Affiliation(s)
- Jonathan Bould
- Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, 250 68 Husinec-Řež, Czech Republic.,Departamento de Química Inorgánica, ISQCH, Universidad de Zaragoza-CSIC, C/Pedro Cerbuna 12, ES-50009 Zaragoza, Spain
| | - Michael G S Londesborough
- Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, 250 68 Husinec-Řež, Czech Republic
| | - Miroslava Litecká
- Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, 250 68 Husinec-Řež, Czech Republic
| | - Ramón Macías
- Departamento de Química Inorgánica, ISQCH, Universidad de Zaragoza-CSIC, C/Pedro Cerbuna 12, ES-50009 Zaragoza, Spain
| | - Suzanne L Shea
- School of Chemistry of the University of Leeds, Leeds LS2 9JT, United Kingdom
| | - Thomas D McGrath
- School of Chemistry of the University of Leeds, Leeds LS2 9JT, United Kingdom.,Department of Chemistry & Biochemistry, Baylor University, Waco, Texas 76798-7348, United States
| | - William Clegg
- School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne, NE1 7RU, United Kingdom
| | - John D Kennedy
- Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, 250 68 Husinec-Řež, Czech Republic.,School of Chemistry of the University of Leeds, Leeds LS2 9JT, United Kingdom
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11
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The Photostability of Novel Boron Hydride Blue Emitters in Solution and Polystyrene Matrix. MATERIALS 2021; 14:ma14030589. [PMID: 33513832 PMCID: PMC7865770 DOI: 10.3390/ma14030589] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Revised: 01/08/2021] [Accepted: 01/19/2021] [Indexed: 11/30/2022]
Abstract
In recent work, the boron hydride anti-B18H22 was announced in the literature as a new laser dye, and, along with several of its derivatives, its solutions are capable of delivering blue luminescence with quantum yields of unity. However, as a dopant in solid polymer films, its luminescent efficiencies reduce dramatically. Clarification of underlying detrimental effects is crucial for any application and, thus, this contribution makes the initial steps in the use of these inorganic compounds in electrooptical devices based on organic polymer thin films. The photoluminescence behavior of the highly luminescent boron hydrides, anti-B18H22 and 3,3′,4,4′-Et4-anti-B18H18, were therefore investigated. The quantum yields of luminescence and photostabilities of both compounds were studied in different solvents and as polymer-solvent blends. The photophysical properties of both boranes are evaluated and discussed in terms of their solvent-solute interactions using photoluminescence (PL) and NMR spectroscopies. The UV degradability of prepared thin films was studied by fluorimetric measurement. The effect of the surrounding atmosphere, dopant concentration and the molecular structure were assessed.
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