Was ist die höchste Koordinationszahl in einer ebenen Struktur?

Das Gerüst von Fenestranen ist einzigartig, da es vier kondensierte Ringe und ein verzerrtes vierfach koordiniertes zentrales Kohlenstoffatom aufweist, dessen Bindungswinkel größer als die regulären 109°28′′ sind. In diesem Kurzaufsatz wird eine detaillierte Übersicht über die Entwicklungen bezüglich dieser Verbindungsklasse, einschließlich ihrer Synthese, für den Zeitraum seit 2006 gegeben. In den vergangenen Jahren wurden Naturstoffe, die als Heterofenestrane klassifiziert werden können, isoliert, und deren Synthesen werden ebenfalls diskutiert.

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Fenestrane in der Synthese: einzigartige und inspirierende Grundgerüste

Boudhar

Charpenay

Blond

et al. 2013

Angewandte Chemie

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Fenestranes in Synthesis: Unique and Highly Inspiring Scaffolds

et al. 2013

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The scaffold of fenestranes is quite unique, as it contains four condensed cycles and a distorted tetracoordinated central carbon atom with bond angles greater than the regular 109°28". In this Minireview, a detailed overview on the developments regarding this compound class, including their synthesis, is given for the time period since 2006. In the past years, natural products that belong to the class of heterofenestranes have been isolated and their syntheses will also be discussed.

et al. 2018

Chemistry A European J

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The viability of noble gas axled boron nanowheels Ng M©B (Ng=Ar-Rn; M=Nb, Ta; n=1, 2) is explored by ab initio computations. In the resulting Ng -M complexes, the Ng-M-Ng nanorod passes through the center of the B ring, providing them with an inverse sandwich-like structure. While in the singly Ng bound analogue, the Ng binding enthalpy H at 298 K ranges from 2.5 to 10.6 kcal mol , in doubly Ng bound cases it becomes very low for the Ng M©B →Ng+NgM©B dissociation channel, except for the case of Rn, for which the corresponding H values are 3.4 (Nb) and 4.0 kcal mol (Ta). For a given Ng, Ta has slightly higher Ng-binding ability than Nb. The corresponding free-energy changes indicate that these systems, particularly the Xe and Rn complexes, are good candidates for experimental realization in a low-temperature matrix. The Ng-M bonds were found to be covalent in nature, as reflected in their large Wiberg bond indices, formation of a 2c-2e σ orbital between Ng and M centers in natural bond orbital and adaptive natural density partitioning (AdNDP) analyses, and the short Ng-M distances. Energy decomposition analysis and a study on the natural orbitals for chemical valence show that the Ng-M contact is supported mainly by the orbital and electrostatic interactions, with almost equal contributions. Although both the Ng→M σ donation and Ng←M π backdonation play roles in the origin of orbital interaction, the former is significantly dominant over the latter. Further, AdNDP analysis indicates that the doubly aromatic character (both σ and π) in MB clusters is not perturbed by the interaction with Ng atoms.

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Was ist die höchste Koordinationszahl in einer ebenen Struktur?

Cited by 3 publications

References 31 publications

Fenestrane in der Synthese: einzigartige und inspirierende Grundgerüste

Fenestrane in der Synthese: einzigartige und inspirierende Grundgerüste

Fenestranes in Synthesis: Unique and Highly Inspiring Scaffolds

Boron Nanowheels with Axles Containing Noble Gas Atoms: Viable Noble Gas Bound M©B₁₀⁻Clusters (M=Nb, Ta)

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Was ist die höchste Koordinationszahl in einer ebenen Struktur?

Cited by 3 publications

References 31 publications

Fenestrane in der Synthese: einzigartige und inspirierende Grundgerüste

Fenestrane in der Synthese: einzigartige und inspirierende Grundgerüste

Fenestranes in Synthesis: Unique and Highly Inspiring Scaffolds

Boron Nanowheels with Axles Containing Noble Gas Atoms: Viable Noble Gas Bound M©B10−Clusters (M=Nb, Ta)

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Product

Resources

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Boron Nanowheels with Axles Containing Noble Gas Atoms: Viable Noble Gas Bound M©B₁₀⁻Clusters (M=Nb, Ta)