1
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Oschmann W, Borner C, Kleeberg C. Unsymmetrical diborane(4) derivatives by copper mediated B-B coupling. Dalton Trans 2018; 47:5318-5327. [PMID: 29589025 DOI: 10.1039/c8dt00627j] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A novel, versatile and modular route to unsymmetrical diborane(4) derivatives bearing either two different diol moieties or one diol and one diamine moiety is presented. Utilising the very basic approach of reacting a boron nucleophile with a boron electrophile to establish the B-B bond allows a simple variation of the two individual boron moieties. The copper(i) boryl complexes used as nucleophilic boron sources are readily accessible from commercially available symmetrical diborane(4) derivatives, whilst equally readily available boron halide derivatives are used as electrophiles. Seven previously inaccessible diborane(4) derivatives were obtained and fully characterised, including single crystal X-ray structure determinations, illustrating the broad scope of the method.
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Affiliation(s)
- W Oschmann
- Institut für Anorganische und Analytische Chemie, Technische Universität Carolo-Wilhelmina zu Braunschweig, Hagenring 30, 38106 Braunschweig, Germany.
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2
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Mazière A, Chrostowska A, Darrigan C, Dargelos A, Graciaa A, Chermette H. Electronic structure of BN-aromatics: Choice of reliable computational tools. J Chem Phys 2017; 147:164306. [PMID: 29096486 DOI: 10.1063/1.4993297] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The importance of having reliable calculation tools to interpret and predict the electronic properties of BN-aromatics is directly linked to the growing interest for these very promising new systems in the field of materials science, biomedical research, or energy sustainability. Ionization energy (IE) is one of the most important parameters to approach the electronic structure of molecules. It can be theoretically estimated, but in order to evaluate their persistence and propose the most reliable tools for the evaluation of different electronic properties of existent or only imagined BN-containing compounds, we took as reference experimental values of ionization energies provided by ultra-violet photoelectron spectroscopy (UV-PES) in gas phase-the only technique giving access to the energy levels of filled molecular orbitals. Thus, a set of 21 aromatic molecules containing B-N bonds and B-N-B patterns has been merged for a comparison between experimental IEs obtained by UV-PES and various theoretical approaches for their estimation. Time-Dependent Density Functional Theory (TD-DFT) methods using B3LYP and long-range corrected CAM-B3LYP functionals are used, combined with the ΔSCF approach, and compared with electron propagator theory such as outer valence Green's function (OVGF, P3) and symmetry adapted cluster-configuration interaction ab initio methods. Direct Kohn-Sham estimation and "corrected" Kohn-Sham estimation are also given. The deviation between experimental and theoretical values is computed for each molecule, and a statistical study is performed over the average and the root mean square for the whole set and sub-sets of molecules. It is shown that (i) ΔSCF+TDDFT(CAM-B3LYP), OVGF, and P3 are the most efficient way for a good agreement with UV-PES values, (ii) a CAM-B3LYP range-separated hybrid functional is significantly better than B3LYP for the purpose, especially for extended conjugated systems, and (iii) the "corrected" Kohn-Sham result is a fast and simple way to predict IEs.
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Affiliation(s)
- Audrey Mazière
- Université de Pau et des Pays de l'Adour, Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux, IPREM, UMR CNRS 5254, Avenue de l'Université, 64000 Pau, France
| | - Anna Chrostowska
- Université de Pau et des Pays de l'Adour, Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux, IPREM, UMR CNRS 5254, Avenue de l'Université, 64000 Pau, France
| | - Clovis Darrigan
- Université de Pau et des Pays de l'Adour, Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux, IPREM, UMR CNRS 5254, Avenue de l'Université, 64000 Pau, France
| | - Alain Dargelos
- Université de Pau et des Pays de l'Adour, Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux, IPREM, UMR CNRS 5254, Avenue de l'Université, 64000 Pau, France
| | - Alain Graciaa
- Université de Pau et des Pays de l'Adour, Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux, IPREM, UMR CNRS 5254, Avenue de l'Université, 64000 Pau, France
| | - Henry Chermette
- Université de Lyon, Université Claude Bernard Lyon-1, ENS-Lyon, Institut des Sciences Analytiques, UMR CNRS 5280, 43 Boulevard du 11 Novembre 1918, F-69622 Villeurbanne Cedex, France
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3
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Kaaz M, Bäucker C, Deimling M, König S, Schlindwein SH, Bender J, Nieger M, Gudat D. Conventional and Microwave Synthesis of 2-Fluoro-diazaborolidines and Their Reaction with Lithium Phosphanides. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700559] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Manuel Kaaz
- Institut für Anorganische Chemie; University of Stuttgart; Pfaffenwaldring 55 70550 Stuttgart Germany
| | - Christian Bäucker
- Institut für Anorganische Chemie; University of Stuttgart; Pfaffenwaldring 55 70550 Stuttgart Germany
| | - Max Deimling
- Institut für Anorganische Chemie; University of Stuttgart; Pfaffenwaldring 55 70550 Stuttgart Germany
| | - Simon König
- Institut für Anorganische Chemie; University of Stuttgart; Pfaffenwaldring 55 70550 Stuttgart Germany
| | - Simon H. Schlindwein
- Institut für Anorganische Chemie; University of Stuttgart; Pfaffenwaldring 55 70550 Stuttgart Germany
| | - Johannes Bender
- Institut für Anorganische Chemie; University of Stuttgart; Pfaffenwaldring 55 70550 Stuttgart Germany
| | - Martin Nieger
- Department of Chemistry; University of Helsinki; P. O. Box 55 00014 Helsinki Finland
| | - Dietrich Gudat
- Institut für Anorganische Chemie; University of Stuttgart; Pfaffenwaldring 55 70550 Stuttgart Germany
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4
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Chrostowska A, Dargelos A, Baylère P, Darrigan C, Weber L, Halama J. UV‐Photoelectron Spectroscopic Studies of the Simplest 2,3‐Dihydro‐1
H
‐1,3,2‐diazaboroles [(CHNH)
2
BX, X = H, CN]. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201500967] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Anna Chrostowska
- Institut des Sciences Analytiques et de Physico‐Chimie pour l'Environnement et les Matériaux, IPREM, UMR CNRS 5254, Université de Pau et des Pays de l'Adour, 64000 Pau, France, http://iprem‐ecp.univ‐pau.fr/live/personnel/anna_chrostowska
| | - Alain Dargelos
- Institut des Sciences Analytiques et de Physico‐Chimie pour l'Environnement et les Matériaux, IPREM, UMR CNRS 5254, Université de Pau et des Pays de l'Adour, 64000 Pau, France, http://iprem‐ecp.univ‐pau.fr/live/personnel/anna_chrostowska
| | - Patrick Baylère
- Institut des Sciences Analytiques et de Physico‐Chimie pour l'Environnement et les Matériaux, IPREM, UMR CNRS 5254, Université de Pau et des Pays de l'Adour, 64000 Pau, France, http://iprem‐ecp.univ‐pau.fr/live/personnel/anna_chrostowska
| | - Clovis Darrigan
- Institut des Sciences Analytiques et de Physico‐Chimie pour l'Environnement et les Matériaux, IPREM, UMR CNRS 5254, Université de Pau et des Pays de l'Adour, 64000 Pau, France, http://iprem‐ecp.univ‐pau.fr/live/personnel/anna_chrostowska
| | - Lothar Weber
- Fakultät für Chemie der Univerität Bielefeld, 33615 Bielefeld, Germany, http://https://www.uni‐bielefeld.de/chemie/emeriti/ac2‐weber/chef/lweber.htm
| | - Johannes Halama
- Fakultät für Chemie der Univerität Bielefeld, 33615 Bielefeld, Germany, http://https://www.uni‐bielefeld.de/chemie/emeriti/ac2‐weber/chef/lweber.htm
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5
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Chrostowska A, Xu S, Mazière A, Boknevitz K, Li B, Abbey ER, Dargelos A, Graciaa A, Liu SY. UV-photoelectron spectroscopy of BN indoles: experimental and computational electronic structure analysis. J Am Chem Soc 2014; 136:11813-20. [PMID: 25089659 PMCID: PMC4140474 DOI: 10.1021/ja5063899] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
![]()
We
present a comprehensive electronic structure analysis of two
BN isosteres of indole using a combined UV-photoelectron spectroscopy
(UV-PES)/computational chemistry approach. Gas-phase He I photoelectron
spectra of external BN indole I and fused BN indole II have been recorded, assessed by density functional theory
calculations, and compared with natural indole. The first ionization
energies of these indoles are natural indole (7.9 eV), external BN
indole I (7.9 eV), and fused BN indole II (8.05 eV). The computationally determined molecular dipole moments
are in the order: natural indole (2.177 D) > fused BN indole II (1.512 D) > external BN indole I (0.543
D).
The λmax in the UV–vis absorption spectra
are in the order: fused BN indole II (292 nm) > external
BN indole I (282 nm) > natural indole (270 nm). The
observed
relative electrophilic aromatic substitution reactivity of the investigated
indoles with dimethyliminium chloride as the electrophile is as follows:
fused BN indole II > natural indole > external
BN indole I, and this trend correlates with the π-orbital
coefficient
at the 3-position. Nucleus-independent chemical shifts calculations
show that the introduction of boron into an aromatic 6π-electron
system leads to a reduction in aromaticity, presumably due to a stronger
bond localization. Trends and conclusions from BN isosteres of simple
monocyclic aromatic systems such as benzene and toluene are not necessarily
translated to the bicyclic indole core. Thus, electronic structure
consequences resulting from BN/CC isosterism will need to be evaluated
individually from system to system.
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Affiliation(s)
- Anna Chrostowska
- Department of Chemistry, Boston College , Chestnut Hill, Massachusetts 02467, United States
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6
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Holzmeier F, Lang M, Hemberger P, Bodi A, Schäfer M, Dewhurst RD, Braunschweig H, Fischer I. Photoionization and pyrolysis of a 1,4-azaborinine: retro-hydroboration in the cation and identification of novel organoboron ring systems. Chemistry 2014; 20:9683-92. [PMID: 24976576 DOI: 10.1002/chem.201402884] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2014] [Indexed: 12/30/2022]
Abstract
The photoionization and dissociative photoionization of 1,4-di-tert-butyl-1,4-azaborinine by means of synchrotron radiation and threshold photoelectron photoion coincidence spectroscopy is reported. The ionization energy of the compound was determined to be 7.89 eV. Several low-lying electronically excited states in the cation were identified. The various pathways for dissociative photoionization were modeled by statistical theory, and appearance energies AE0K were obtained. The loss of isobutene in a retro-hydroboration reaction is the dominant pathway, which proceeds with a reverse barrier. Pyrolysis of the parent compound in a chemical reactor leads to the generation of several yet unobserved boron compounds. The ionization energies of the C4 H6 BN isomers 1,2- and 1,4-dihydro-1,4-azaborinine and the C3 H6 BN isomer 1,2-dihydro-1,3-azaborole were determined from threshold photoelectron spectra.
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Affiliation(s)
- Fabian Holzmeier
- Institute of Physical and Theoretical Chemistry, University of Würzburg, Am Hubland, 97074 Würzburg (Germany)
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7
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Kleeberg C, Grunenberg J, Xie X. K–H3C and K–Sn Interactions in Potassium Trimethylstannyl Complexes: A Structural, Mechanochemical, and NMR Study. Inorg Chem 2014; 53:4400-10. [DOI: 10.1021/ic500065s] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Christian Kleeberg
- Institut für Anorganische und Analytische Chemie, Technische Universität Carolo-Wilhelmina zu Braunschweig , Hagenring 30, 38106 Braunschweig, Germany
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8
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Chrostowska A, Mazière A, Dargelos A, Graciaa A, Darrigan C, Weber L, Halama J. Electronic Structure of 1,2‐Dihydro[1,3,2]diazaborolo[1,5‐
a
]pyridine in Comparison with the Parent Isoindole. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201301205] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Anna Chrostowska
- Institut des Sciences Analytiques et de Physico‐Chimie pour l'Environnement et les Matériaux, IPREM, UMR CNRS 5254, Université de Pau et des Pays de l'Adour, 64000 Pau, France, http://www.univ‐pau.fr/live/
| | - Audrey Mazière
- Institut des Sciences Analytiques et de Physico‐Chimie pour l'Environnement et les Matériaux, IPREM, UMR CNRS 5254, Université de Pau et des Pays de l'Adour, 64000 Pau, France, http://www.univ‐pau.fr/live/
| | - Alain Dargelos
- Institut des Sciences Analytiques et de Physico‐Chimie pour l'Environnement et les Matériaux, IPREM, UMR CNRS 5254, Université de Pau et des Pays de l'Adour, 64000 Pau, France, http://www.univ‐pau.fr/live/
| | - Alain Graciaa
- Institut des Sciences Analytiques et de Physico‐Chimie pour l'Environnement et les Matériaux, IPREM, UMR CNRS 5254, Université de Pau et des Pays de l'Adour, 64000 Pau, France, http://www.univ‐pau.fr/live/
| | - Clovis Darrigan
- Institut des Sciences Analytiques et de Physico‐Chimie pour l'Environnement et les Matériaux, IPREM, UMR CNRS 5254, Université de Pau et des Pays de l'Adour, 64000 Pau, France, http://www.univ‐pau.fr/live/
| | - Lothar Weber
- Fakultät für Chemie der Univerität Bielefeld, 33615 Bielefeld, Germany, http://www.uni‐bielefeld.de
| | - Johannes Halama
- Fakultät für Chemie der Univerität Bielefeld, 33615 Bielefeld, Germany, http://www.uni‐bielefeld.de
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9
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Weber L, Halama J, Böhling L, Brockhinke A, Chrostowska A, Darrigan C, Dargelos A, Stammler H, Neumann B. 1,3,2‐Benzodiazaboroles with 1,3‐Pentafluorophenyl and Tetrafluoropyridyl Substituents as Building Blocks in Luminescent Compounds. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201300319] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Lothar Weber
- Fakultät für Chemie der Universität Bielefeld, 33615 Bielefeld, Germany, http://www.Uni‐bielefeld.de
| | - Johannes Halama
- Fakultät für Chemie der Universität Bielefeld, 33615 Bielefeld, Germany, http://www.Uni‐bielefeld.de
| | - Lena Böhling
- Fakultät für Chemie der Universität Bielefeld, 33615 Bielefeld, Germany, http://www.Uni‐bielefeld.de
| | - Andreas Brockhinke
- Fakultät für Chemie der Universität Bielefeld, 33615 Bielefeld, Germany, http://www.Uni‐bielefeld.de
| | - Anna Chrostowska
- IPREM, UMR 5254, Université de Pau et Pays de l'Adour, 64000 Pau, France
| | - Clovis Darrigan
- IPREM, UMR 5254, Université de Pau et Pays de l'Adour, 64000 Pau, France
| | - Alain Dargelos
- IPREM, UMR 5254, Université de Pau et Pays de l'Adour, 64000 Pau, France
| | - Hans‐Georg Stammler
- Fakultät für Chemie der Universität Bielefeld, 33615 Bielefeld, Germany, http://www.Uni‐bielefeld.de
| | - Beate Neumann
- Fakultät für Chemie der Universität Bielefeld, 33615 Bielefeld, Germany, http://www.Uni‐bielefeld.de
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10
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Kleeberg C. On the structural diversity of [K(18-crown-6)EPh3] complexes (E = C, Si, Ge, Sn, Pb): synthesis, crystal structures and NOESY NMR study. Dalton Trans 2013; 42:8276-87. [PMID: 23599065 DOI: 10.1039/c3dt50523e] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Christian Kleeberg
- Institut für Anorganische und Analytischen Chemie der Technischen Universität Carolo-Wilhelmina zu Braunschweig, Hagenring 30, 38106 Braunschweig, Germany.
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11
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Chrostowska A, Xu S, Lamm AN, Mazière A, Weber CD, Dargelos A, Baylère P, Graciaa A, Liu SY. UV-photoelectron spectroscopy of 1,2- and 1,3-azaborines: a combined experimental and computational electronic structure analysis. J Am Chem Soc 2012; 134:10279-85. [PMID: 22616808 PMCID: PMC3380147 DOI: 10.1021/ja303595z] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
We present a comprehensive electronic structure analysis of structurally simple BN heterocycles using a combined UV-photoelectron spectroscopy (UV-PES)/computational chemistry approach. Gas-phase He I photoelectron spectra of 1,2-dihydro-1,2-azaborine 1, N-Me-1,2-BN-toluene 2, and N-Me-1,3-BN-toluene 3 have been recorded, assessed by density functional theory calculations, and compared with their corresponding carbonaceous analogues benzene and toluene. The first ionization energies of these BN heterocycles are in the order N-Me-1,3-BN-toluene 3 (8.0 eV) < N-Me-1,2-BN-toluene 2 (8.45 eV) < 1,2-dihydro-1,2-azaborine 1 (8.6 eV) < toluene (8.83 eV) < benzene (9.25 eV). The computationally determined molecular dipole moments are in the order 3 (4.577 D) > 2 (2.209 D) > 1 (2.154 D) > toluene (0.349 D) > benzene (0 D) and are consistent with experimental observations. The λ(max) in the UV-vis absorption spectra are in the order 3 (297 nm) > 2 (278 nm) > 1 (269 nm) > toluene (262 nm) > benzene (255 nm). We also establish that the measured anodic peak potentials and electrophilic aromatic substitution (EAS) reactivity of BN heterocycles 1-3 are consistent with the electronic structure description determined by the combined UV-PES/computational chemistry approach.
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Affiliation(s)
- Anna Chrostowska
- Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux, UMR CNRS 5254, Université de Pau et des Pays de l'Adour, Avenue de l'Université, BP 1155, 64 013 Pau Cedex, France.
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12
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Weber L, Kahlert J, Brockhinke R, Böhling L, Brockhinke A, Stammler HG, Neumann B, Harder RA, Fox MA. Luminescence properties of C-diazaborolyl-ortho-carboranes as donor-acceptor systems. Chemistry 2012; 18:8347-57. [PMID: 22623079 DOI: 10.1002/chem.201200390] [Citation(s) in RCA: 143] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2012] [Indexed: 11/08/2022]
Abstract
Seven derivatives of 1,2-dicarbadodecaborane (ortho-carborane, 1,2-C(2)B(10)H(12)) with a 1,3-diethyl- or 1,3-diphenyl-1,3,2-benzodiazaborolyl group on one cage carbon atom were synthesized and structurally characterized. Six of these compounds showed remarkable low-energy fluorescence emissions with large Stokes shifts of 15100-20260 cm(-1) and quantum yields (Φ(F)) of up to 65% in the solid state. The low-energy fluorescence emission, which was assigned to a charge-transfer (CT) transition between the cage and the heterocyclic unit, depended on the orientation (torsion angle, ψ) of the diazaborolyl group with respect to the cage C-C bond. In cyclohexane, two compounds exhibited very weak dual fluorescence emissions with Stokes shifts of 15660-18090 cm(-1) for the CT bands and 1960-5540 cm(-1) for the high-energy bands, which were assigned to local transitions within the benzodiazaborole units (local excitation, LE), whereas four compounds showed only CT bands with Φ(F) values between 8-32%. Two distinct excited singlet-state (S(1)) geometries, denoted S(1)(LE) and S(1)(CT), were observed computationally for the benzodiazaborolyl-ortho-carboranes, the population of which depended on their orientation (ψ). TD-DFT calculations on these excited state geometries were in accord with their CT and LE emissions. These C-diazaborolyl-ortho-carboranes were viewed as donor-acceptor systems with the diazaborolyl group as the donor and the ortho-carboranyl group as the acceptor.
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Affiliation(s)
- Lothar Weber
- Fakultät für Chemie der Universität Bielefeld, 33615 Bielefeld, Germany.
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13
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Weber L, Eickhoff D, Kahlert J, Böhling L, Brockhinke A, Stammler HG, Neumann B, Fox MA. Diazaborolyl-boryl push–pull systems with ethynylene–arylene bridges as ‘turn-on’ fluoride sensors. Dalton Trans 2012; 41:10328-46. [DOI: 10.1039/c2dt30438d] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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14
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Weber L, Kuhtz H, Böhling L, Brockhinke A, Chrostowska A, Dargelos A, Mazière A, Stammler HG, Neumann B. Syntheses of rod-shaped fluorescent 1,3,2-benzodiazaboroles with phosphonium, and phosphane chalcogenide acceptor functions. Dalton Trans 2012; 41:10440-52. [DOI: 10.1039/c2dt30666b] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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15
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Weber L, Eickhoff D, Marder TB, Fox MA, Low PJ, Dwyer AD, Tozer DJ, Schwedler S, Brockhinke A, Stammler HG, Neumann B. Experimental and Theoretical Studies on Organic D-π-A Systems Containing Three-Coordinate Boron Moieties as both π-Donor and π-Acceptor. Chemistry 2011; 18:1369-82. [DOI: 10.1002/chem.201102059] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2011] [Indexed: 11/07/2022]
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16
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Weber L, Eickhoff D, Werner V, Böhling L, Schwedler S, Chrostowska A, Dargelos A, Maciejczyk M, Stammler HG, Neumann B. Syntheses, crystal structures, photophysical and theoretical studies of 1,3,2-benzodiazaborolyl-functionalized diphenylacetylenes. Dalton Trans 2011; 40:4434-46. [DOI: 10.1039/c0dt01410a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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17
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Weber L, Halama J, Werner V, Hanke K, Böhling L, Chrostowska A, Dargelos A, Maciejczyk M, Raza AL, Stammler HG, Neumann B. Synthetic, Structural, Photophysical and Computational Studies on π-Conjugated 1,3,2-Benzodiazaboroles with Carbazole Building Blocks. Eur J Inorg Chem 2010. [DOI: 10.1002/ejic.201000665] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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18
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Chrostowska A, Maciejczyk M, Dargelos A, Baylère P, Weber L, Werner V, Eickhoff D, Stammler HG, Neumann B. UV-Photoelectron Spectroscopic Studies on 2-Arylethynyl-1,3,2-benzodiazaboroles. Organometallics 2010. [DOI: 10.1021/om100352c] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Anna Chrostowska
- Equipe Chimie Physique, IPREM,
UMR 5254, Université de Pau et des Pays de l′Adour,
2 Avenue du Président Angot, BP 1155, 64013 Pau Cédex,
France
| | - Małgorzata Maciejczyk
- Equipe Chimie Physique, IPREM,
UMR 5254, Université de Pau et des Pays de l′Adour,
2 Avenue du Président Angot, BP 1155, 64013 Pau Cédex,
France
| | - Alain Dargelos
- Equipe Chimie Physique, IPREM,
UMR 5254, Université de Pau et des Pays de l′Adour,
2 Avenue du Président Angot, BP 1155, 64013 Pau Cédex,
France
| | - Patrick Baylère
- Equipe Chimie Physique, IPREM,
UMR 5254, Université de Pau et des Pays de l′Adour,
2 Avenue du Président Angot, BP 1155, 64013 Pau Cédex,
France
| | - Lothar Weber
- Fakultät für Chemie der Universität Bielefeld, D-33615 Bielefeld, Germany
| | - Vanessa Werner
- Fakultät für Chemie der Universität Bielefeld, D-33615 Bielefeld, Germany
| | - Daniel Eickhoff
- Fakultät für Chemie der Universität Bielefeld, D-33615 Bielefeld, Germany
| | | | - Beate Neumann
- Fakultät für Chemie der Universität Bielefeld, D-33615 Bielefeld, Germany
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Weber L, Werner V, Fox MA, Marder TB, Schwedler S, Brockhinke A, Stammler HG, Neumann B. Synthetic, structural, photophysical and computational studies on 2-arylethynyl-1,3,2-diazaboroles. Dalton Trans 2009:2823-31. [PMID: 19333506 DOI: 10.1039/b821208b] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
New 2-arylalkynyl benzo-1,3,2-diazaboroles, 2-(4'-XC(6)H(4)C[triple bond, length as m-dash]C)-1,3-Et(2)-1,3,2-N(2)BC(6)H(4) (X =Me ; MeO ; MeS ; Me(2)N ), were prepared from B-bromodiazaborole, 2-Br-1,3-Et(2)-1,3,2-N(2)BC(6)H(4), with the appropriate lithiated arylacetylene, ArC[triple bond, length as m-dash]CLi. Molecular structures of , and were determined by X-ray diffraction studies. UV-vis and luminescence spectroscopic studies on these diazaboroles reveal intense blue/violet fluorescence with very large quantum yields of 0.89-0.99 for . The experimental findings were complemented by DFT and TD-DFT calculations. The Stokes shift of only 2600 cm(-1) for , compared to Stokes shifts in the range of 5900-7300 cm(-1) for , is partly explained by the different electronic structures found in compared to (X = H). The HOMO is mainly located on the aryl group in and on the diazaborolyl group in whereas the LUMOs are largely aryl in character for all compounds. Thus, in contrast to other conjugated systems containing three-coordinate boron centers such as B(Mes)(2), (Mes = 2,4,6-Me(3)C(6)H(2)), in which the boron serves as a pi-acceptor, the 10-pi electron benzodiazaborole moiety appears to function as a pi-donor moiety.
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Affiliation(s)
- Lothar Weber
- Universität Bielefeld, Fakultät für Chemie, Anorganische Chemie, Universitätsstr. 25, 33615 Bielefeld, Germany.
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Weber L, Werner V, Fox MA, Marder TB, Schwedler S, Brockhinke A, Stammler HG, Neumann B. Synthetic, structural, photophysical and computational studies of π-conjugated bis- and tris-1,3,2-benzodiazaboroles and related bis(boryl) dithiophenes. Dalton Trans 2009:1339-51. [PMID: 19462655 DOI: 10.1039/b815931a] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Lothar Weber
- Fakultät fur Chemie der Universität Bielefeld, Universitätsstrasse 25, 33615 Bielefeld, Germany.
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Hill NJ, Vargas-Baca I, Cowley AH. Recent developments in the coordination chemistry of bis(imino)acenaphthene (BIAN) ligands with s- and p-block elements. Dalton Trans 2009:240-53. [DOI: 10.1039/b815079f] [Citation(s) in RCA: 118] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Weber L, Kahlert J, Stammler HG, Neumann B. Syntheses, Structure, Electrochemistry, and Optical Properties of 1,3-Diethyl-2,3-dihydro-1-H-1,3,2-pyrido-[4,5-b]-diazaboroles. Z Anorg Allg Chem 2008. [DOI: 10.1002/zaac.200800157] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Weber L. Recent developments in the chemistry of 1,3,2-diazaborolines-(2,3-dihydro-1H-1,3,2-diazaboroles). Coord Chem Rev 2008. [DOI: 10.1016/j.ccr.2007.02.014] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Weber L, Penner A, Domke I, Stammler HG, Neumann B. Synthese, Struktur, Elektrochemie und optische Eigenschaften von alkinylfunktionalisierten 1,3,2-Diazaborolen und 1,3,2-Diazaborolidinen. Z Anorg Allg Chem 2007. [DOI: 10.1002/zaac.200600351] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Weber L, Förster J, Stammler HG, Neumann B. Contribution to the Reactivity ofN,N′-Diaryl-1,4-diazabutadienes Aryl–N=CH–CH=N–Aryl (Aryl = 2,6-Dimethylphenyl; 2,4,6-Trimethylphenyl) Towards Boron Trichloride. Eur J Inorg Chem 2006. [DOI: 10.1002/ejic.200600728] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Weber L, Domke I, Kahlert J, Stammler HG. Chemical Oxidation of 1,3,2-Diazaboroles and 1,3,2-Diazaborolidines. Eur J Inorg Chem 2006. [DOI: 10.1002/ejic.200600006] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Weber L, Werner V, Domke I, Stammler HG, Neumann B. 1,3,2-Diazaborolyl-functionalized thiophenes and dithiophenes: synthesis, structure, electrochemistry and luminescence. Dalton Trans 2006:3777-84. [PMID: 16883404 DOI: 10.1039/b603365b] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Reaction of 2-bromo-1,3-diethyl-1,3,2-benzodiazaborole (1) with equimolar amounts of thienyl lithium or 2,2-dithienyl lithium led to the generation of benzodiazaboroles 2 and 3 which are functionalized at the boron atom by a 2-thienyl or a 5-(2,2-dithienyl) unit. Similarly 2-bromo-1,3-diethyl-1,3,2-naphthodiazaborole (4) and thienyl lithium or 2,2-dithienyl lithium afforded the naphthoborolyl-substituted thiophene 5 or dithiophene 6. Treatment of 2,5-bis(dibromoboryl)-thiophene 7 with 2 eq. of tBuN=CH-CH=NtBu in n-hexane followed by sodium amalgam reduction of the obtained bis(diazaborolium) salt 8 gave the 2,5-bis(diazaborolyl)thiophene 9. The 2,5-bis(diazaborolidinyl)-thiophene 10 resulted from the cyclocondensation of 7 with 2 eq. of N,N-di-tert-butylethylenediamine in the presence of NEt3. Analogously, cyclocondensation of 7 with N,N-diethylphenylenediamine gave the bis(benzodiazaborolyl) functionalized thiophene 11. The novel compounds were characterized by elemental analysis and spectroscopy (1H-, 11B-, 13C-NMR, MS and UV-VIS). The molecular structure of 3 was elucidated by X-ray diffraction. Cyclovoltammograms show an irreversible oxidation wave at 298-598 vs. Fc/Fc+. The borolylated thiophenes and dithienyls show intense blue luminescence with Stokes shifts of 30-107 nm.
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Affiliation(s)
- Lothar Weber
- Fakultät für Chemie der Universität Bielefeld, Universitätsstrasse 25, 33615, Bielefeld, Germany.
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Weber L, Domke I, Schmidt C, Braun T, Stammler HG, Neumann B. Syntheses, structures, luminescence and electrochemistry of benzene- and biphenyl-centered bis- and tris-1,3,2-diazaboroles and -1,3,2-diazaborolidines. Dalton Trans 2006:2127-32. [PMID: 16625257 DOI: 10.1039/b514920g] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Reaction of 1,4-bis(dibromoboryl)benzene (1a) with 2 equiv. of the diazabutadiene tBuN=CH-CH=NtBu and subsequent reduction of the obtained bis(1,3,2-diazaborolium)salt 2a with sodium amalgam afforded the 1,4-bis(1,3,2-diazaborolyl)benzene 3a. Similarly, 1,3-bis(dibromoboryl)benzene (1b), 1,3,5-tris(dibromoboryl)benzene (1c) and 4,4'-bis(dibromoboryl)biphenyl (1d) were converted into compounds 3b, 3c and 3d which contain two or three diazaborolyl substituents at the arene core. Treatment of precursors 1a,b,d with two equiv. or with three equiv. of N,N'-di-tert-butylethane-1,2-diamine in the presence of an excess of NEt3 gave rise to the diazaborolidine derivatives 4a-4d. Reaction of 1,3-bis(diiodoboryl)benzene with two equivalents of N,N'-dimethylethane-1,2-diamine in the presence of NEt3 furnished the corresponding 1,3-bis(diazaborolidinyl)benzene 4e. The novel compounds were characterized by elemental analyses and spectroscopy (1H, 13C, 11B NMR, MS). The molecular structures of 3c, 4a and 4e were eludicated by X-ray-diffraction analyses. In addition to this, the oxidative cyclovoltammograms and blue emission spectra of these novel compounds were discussed. Here, the electronic communication between boron heterocycles on the different spacer-units and the luminescence of the oligo-diazaborolylarenes were of interest.
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Affiliation(s)
- Lothar Weber
- Fakultät für Chemie der Universität Bielefeld, Universitätsstrasse 25, D-33615, Bielefeld, Germany
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