Chlorinated polyhedral selenaboranes revisited by joint experimental/computational efforts: the formation of closo-1-SeB9Cl9 and the crystal structure of closo-SeB11Cl11
The recent success in the formation of chlorinated telluraboranes and the reactivities of pnictogenaboranes prompted us to re-examine the vacuum co-pyrolysis of B2Cl4 with Se2Cl2 at various molar ratios and temperatures in order to search for the generation of other polyhedral selenaboranes than clo...
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| Main Authors: | , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
02 November 2023
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| In: |
Dalton transactions
Year: 2023, Volume: 52, Issue: 45, Pages: 16886-16893 |
| ISSN: | 1477-9234 |
| DOI: | 10.1039/d3dt02987e |
| Online Access: | Resolving-System, kostenfrei: https://doi.org/10.1039/d3dt02987e Verlag, lizenzpflichtig, Volltext: https://pubs.rsc.org/en/content/articlelanding/2023/dt/d3dt02987e 
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| Author Notes: | Willi Keller, Matthias Hofmann, Hubert Wadepohl, Markus Enders, Jindřich Fanfrlík and Drahomír Hnyk |
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| 245 | 1 | 0 | |a Chlorinated polyhedral selenaboranes revisited by joint experimental/computational efforts |b the formation of closo-1-SeB9Cl9 and the crystal structure of closo-SeB11Cl11 |c Willi Keller, Matthias Hofmann, Hubert Wadepohl, Markus Enders, Jindřich Fanfrlík and Drahomír Hnyk |
| 246 | 3 | 3 | |a Chlorinated polyhedral selenaboranes revisited by joint experimental/computational efforts$dthe formation of closo-1-SeB 9 Cl 9 and the crystal structure of closo-SeB 11 Cl 11 |
| 264 | 1 | |c 02 November 2023 | |
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| 520 | |a The recent success in the formation of chlorinated telluraboranes and the reactivities of pnictogenaboranes prompted us to re-examine the vacuum co-pyrolysis of B2Cl4 with Se2Cl2 at various molar ratios and temperatures in order to search for the generation of other polyhedral selenaboranes than closo-SeB5Cl5 (1a) and closo-SeB11Cl11 (1b), the latter being observed earlier. Interestingly, a new compound with the elemental composition SeB9Cl9 (2) was detected, this time by high- and low-resolution mass spectrometry. Further characterization by 1- and 2-D 11B-NMR spectroscopy suggests that 2 should adopt a closed bicapped square-antiprismatic geometry with selenium at the apical position. Moreover, vacuum sublimation gave suitable crystals of 1b, which were subjected to single-crystal X-ray structure determination. Crystallographic data analysis confirmed that 1b, consistent with its 26 skeletal electron count, adopts a distorted icosahedral structure close to the symmetry of C5v. Computations at the DFT-D3 level have revealed that 33% of the total computed binding motifs in the grown 1b crystals are due to the very strong chalcogen bonding. Moreover, SAPT decomposition has shown that the bonding motifs in the crystals are stabilized mainly by dispersion and electrostatic terms. Homodecoupling and high resolution 11B NMR and 77Se NMR experiments have resolved both coupling constants 1J(11B11B) and 1J(77Se11B) as well as the 77Se chemical shift of 1a and 1b, which are in reasonable agreement with the corresponding computed values. The computed 11B chemical shifts of 2 were determined by the well-established DFT/GIAO/NMR structural tool based on its B3LYP/6-311+G** internal coordinates. They agree well with the experimental values and provide a good representation of the molecular structure of 2 in solution. The extraordinary downfield 11B NMR chemical shift of B(10) in 2 has been ascribed to the intensive paramagnetic contribution to the shielding tensor in this bicapped square-antiprismatic motif. Calculations of the synproportionation free energies of smaller (n - 1) closo-selenaboranes with larger-sized (n + 1) ones support the extraordinary stability of octahedral, bicapped square-antiprismatic and icosahedral closo motifs in the SeBnCln family (n = 4-12). | ||
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