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Article

How the Position of Substitution Affects Intermolecular Bonding in Halogen Derivatives of Carboranes: Crystal Structures of 1,2,3- and 8,9,12-Triiodo- and 8,9,12-Tribromo ortho-Carboranes

by
Kyrill Yu. Suponitsky
1,2,
Sergey A. Anufriev
1 and
Igor B. Sivaev
1,2,*
1
A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilov Str., Moscow 119334, Russia
2
Basic Department of Chemistry of Innovative Materials and Technologies, G.V. Plekhanov Russian University of Economics, 36 Stremyannyi Line, Moscow 117997, Russia
*
Author to whom correspondence should be addressed.
Molecules 2023, 28(2), 875; https://doi.org/10.3390/molecules28020875
Submission received: 31 October 2022 / Revised: 10 January 2023 / Accepted: 12 January 2023 / Published: 15 January 2023
(This article belongs to the Special Issue Chemical Bond and Intermolecular Interactions)

Abstract

The crystal structures of two isomeric triiodo derivatives of ortho-carborane containing substituents in the three most electron-withdrawing positions of the carborane cage, 1,2,3-I3-1,2-C2B10H9, and the three most electron-donating positions, 8,9,12-I3-1,2-C2B10H9, as well as the crystal structure of 8,9,12-Br3-1,2-C2B10H9, were determined by single-crystal X-ray diffraction. In the structure of 1,2,3-I3-1,2-C2B10H9, an iodine atom attached to the boron atom (position 3) donates its lone pairs simultaneously to the σ-holes of both iodine atoms attached to the carbon atoms (positions 1 and 2) with the I⋯I distance of 3.554(2) Å and the C-I⋯I and B-I⋯I angles of 169.2(2)° and 92.2(2)°, respectively. The structure is additionally stabilized by a few B-H⋯I-shortened contacts. In the structure of 8,9,12-I3-1,2-C2B10H9, the I⋯I contacts of type II are very weak (the I⋯I distance is 4.268(4) Å, the B8-I8⋯I12 and B12-I12⋯I8 angles are 130.2(3)° and 92.2(3)°) and can only be regarded as dihalogen bonds formally. In comparison with the latter, the structure of 8,9,12-Br3-1,2-C2B10H9 demonstrates both similarities and differences. No Br⋯Br contacts of type II are observed, while there are two Br⋯Br halogen bonds of type I.
Keywords: ortho-carborane; iodo derivatives; X-ray structure; I⋯I dihalogen bond ortho-carborane; iodo derivatives; X-ray structure; I⋯I dihalogen bond
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MDPI and ACS Style

Suponitsky, K.Y.; Anufriev, S.A.; Sivaev, I.B. How the Position of Substitution Affects Intermolecular Bonding in Halogen Derivatives of Carboranes: Crystal Structures of 1,2,3- and 8,9,12-Triiodo- and 8,9,12-Tribromo ortho-Carboranes. Molecules 2023, 28, 875. https://doi.org/10.3390/molecules28020875

AMA Style

Suponitsky KY, Anufriev SA, Sivaev IB. How the Position of Substitution Affects Intermolecular Bonding in Halogen Derivatives of Carboranes: Crystal Structures of 1,2,3- and 8,9,12-Triiodo- and 8,9,12-Tribromo ortho-Carboranes. Molecules. 2023; 28(2):875. https://doi.org/10.3390/molecules28020875

Chicago/Turabian Style

Suponitsky, Kyrill Yu., Sergey A. Anufriev, and Igor B. Sivaev. 2023. "How the Position of Substitution Affects Intermolecular Bonding in Halogen Derivatives of Carboranes: Crystal Structures of 1,2,3- and 8,9,12-Triiodo- and 8,9,12-Tribromo ortho-Carboranes" Molecules 28, no. 2: 875. https://doi.org/10.3390/molecules28020875

APA Style

Suponitsky, K. Y., Anufriev, S. A., & Sivaev, I. B. (2023). How the Position of Substitution Affects Intermolecular Bonding in Halogen Derivatives of Carboranes: Crystal Structures of 1,2,3- and 8,9,12-Triiodo- and 8,9,12-Tribromo ortho-Carboranes. Molecules, 28(2), 875. https://doi.org/10.3390/molecules28020875

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