Rare antimony(iii) imidazole selone complexes: steric controlled structural and bonding aspects

Nandeshwar, Muneshwar and Adinarayana, Mannem and Srinivas, Katam and Velappan, Kavitha and Prabusankar, Ganesan (2020) Rare antimony(iii) imidazole selone complexes: steric controlled structural and bonding aspects. Dalton Transactions, 49 (47). pp. 17331-17340. ISSN 1477-9226

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Novel antimony(iii) imidazole selone complexes in a super crowded environment are reported for the first time. The super bulky selone antimony complexes, [{IPr∗Se}(SbCl3)2] (1) and [{IPr∗Se}(SbBr3)2] (2), were isolated from the reactions between IPr∗Se (IPr∗Se = [1,3-bis(2,6-diphenylmethylphenyl)imidazole selone]) and suitable antimony(iii) halides. 1 and 2 are dinuclear complexes with a Sb:Se ratio of 1:0.5 with an unusual coordination mode of selone. The molecules 1 and 2 consist of both Menshutkin-type Sb⋯πaryl interactions and a Sb-Se coordination bond. However, the reaction between antimony(iii) halides and [(IPaul)Se] ([(IPaul)Se] = [1,3-bis(2,4-methyl-6-diphenyl phenyl)imidazole selone]) with a spatially defined steric impact gave the dinuclear complex [{(IPaul)Se}(SbCl3)]2 (3) and the mononuclear complex [{(IPaul)Se}(SbBr3)] (4) without Menshutkin-type interactions. The Sb:Se ratio in 3 and 4 is 1:1. Interestingly, the Menshutkin-type interaction was absent in 3 and 4 due to the efficient coordinating ability of the ligand [(IPaul)Se] with the Sb(iii) center compared to that of the super bulky ligand IPr∗Se. The thermal property of these antimony selone complexes was also investigated. Density functional theory (DFT) calculations were carried out on the model systems [L(SbCl3)2] (1A), [L(SbCl3)] (1B), [L′(SbCl3)2] (1C), and [L′(SbCl3)] (1D), where L = [1,3-bis(2,6-diisopropyl-4-methyl phenyl)imidazole selone] and L′ = [1,3-bis(phenyl)imidazole selone], to understand the nature of orbitals and bonding situations. The computed metrical parameters of 1A are in good agreement with the experimental values. Natural population analysis of the model system reveals that the natural charge and total population of antimony(iii) are comparable. The unequal interaction between selenium and antimony obtained using Wiberg bond indices (WBIs) is fully consistent with the findings of the single-crystal X-ray studies.

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IITH Creators:
IITH CreatorsORCiD
Item Type: Article
Uncontrolled Keywords: Bonding situation; Coordination bonds; Coordination modes; Dinuclear complex; Experimental values; Mononuclear complexes; Natural population analysis; X-ray studies
Subjects: Chemistry
Chemistry > Inorganic chemistry
Chemical Engineering
Divisions: Department of Chemistry
Depositing User: . LibTrainee 2021
Date Deposited: 21 Jun 2021 09:23
Last Modified: 24 Feb 2022 11:09
URI: http://raiith.iith.ac.in/id/eprint/7957
Publisher URL: http://doi.org/10.1039/d0dt02999h
OA policy: https://v2.sherpa.ac.uk/id/publication/18010
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