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An isolable, crystalline complex of square-planar silicon(IV)

The structure and reactivity of silicon(IV), the second most abundant element in our Earth's crust, is determined by its invariant tetrahedral coordination geometry. Silicon(IV) with a square-planar configuration (ptSi(IV)) represents a transition state. Quantum theory supported the feasibility...

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Detalles Bibliográficos
Autores principales: Ebner, Fabian, Greb, Lutz
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Elsevier 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8367297/
https://www.ncbi.nlm.nih.gov/pubmed/34435162
http://dx.doi.org/10.1016/j.chempr.2021.05.002
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author Ebner, Fabian
Greb, Lutz
author_facet Ebner, Fabian
Greb, Lutz
author_sort Ebner, Fabian
collection PubMed
description The structure and reactivity of silicon(IV), the second most abundant element in our Earth's crust, is determined by its invariant tetrahedral coordination geometry. Silicon(IV) with a square-planar configuration (ptSi(IV)) represents a transition state. Quantum theory supported the feasibility of stabilizing ptSi(IV) by structural constraint, but its isolation has not been achieved yet. Here, we present the synthesis and full characterization of the first square-planar coordinated silicon(IV). The planarity provokes an extremely low-lying unoccupied molecular orbital that induces unusual silicon redox chemistry and CH-agostic interactions. The small separation of the frontier molecular orbitals enables visible-light ligand-element charge transfer and bond-activation reactivity. Previously, such characteristics have been reserved for d-block metals or low-valent p-block elements. Planarization transfers them, for the first time, to a p-block element in the normal valence state.
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spelling pubmed-83672972021-08-23 An isolable, crystalline complex of square-planar silicon(IV) Ebner, Fabian Greb, Lutz Chem Article The structure and reactivity of silicon(IV), the second most abundant element in our Earth's crust, is determined by its invariant tetrahedral coordination geometry. Silicon(IV) with a square-planar configuration (ptSi(IV)) represents a transition state. Quantum theory supported the feasibility of stabilizing ptSi(IV) by structural constraint, but its isolation has not been achieved yet. Here, we present the synthesis and full characterization of the first square-planar coordinated silicon(IV). The planarity provokes an extremely low-lying unoccupied molecular orbital that induces unusual silicon redox chemistry and CH-agostic interactions. The small separation of the frontier molecular orbitals enables visible-light ligand-element charge transfer and bond-activation reactivity. Previously, such characteristics have been reserved for d-block metals or low-valent p-block elements. Planarization transfers them, for the first time, to a p-block element in the normal valence state. Elsevier 2021-08-12 /pmc/articles/PMC8367297/ /pubmed/34435162 http://dx.doi.org/10.1016/j.chempr.2021.05.002 Text en © 2021 The Authors https://creativecommons.org/licenses/by/4.0/This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Ebner, Fabian
Greb, Lutz
An isolable, crystalline complex of square-planar silicon(IV)
title An isolable, crystalline complex of square-planar silicon(IV)
title_full An isolable, crystalline complex of square-planar silicon(IV)
title_fullStr An isolable, crystalline complex of square-planar silicon(IV)
title_full_unstemmed An isolable, crystalline complex of square-planar silicon(IV)
title_short An isolable, crystalline complex of square-planar silicon(IV)
title_sort isolable, crystalline complex of square-planar silicon(iv)
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8367297/
https://www.ncbi.nlm.nih.gov/pubmed/34435162
http://dx.doi.org/10.1016/j.chempr.2021.05.002
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