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Structure and Bonding in Planar Hypercoordinate Carbon Compounds

Authors :
Prasenjit Das
Pratim Kumar Chattaraj
Source :
Chemistry, Vol 4, Iss 4, Pp 1723-1756 (2022)
Publication Year :
2022
Publisher :
MDPI AG, 2022.

Abstract

The term hypercoordination refers to the extent of the coordination of an element by its normal value. In the hypercoordination sphere, the element can achieve planar and/or non-planar molecular shape. Hence, planar hypercoordinate carbon species violate two structural rules: (i) The highest coordination number of carbon is four and (ii) the tetrahedral orientation by the connected elements and/or groups. The unusual planar orientations are mostly stabilized by the electronic interactions of the central atom with the surrounding ligands. In this review article, we will talk about the current progress in the theoretical prediction of viable planar hypercoordinate carbon compounds. Primary knowledge of the planar hypercoordinate chemistry will lead to its forthcoming expansion. Experimental and theoretical interests in planar tetracoordinate carbon (ptC), planar pentacoordinate carbon (ppC), and planar hexacoordinate carbon (phC) are continued. The proposed electronic and mechanical strategies are helpful for the designing of the ptC compounds. Moreover, the 18-valence electron rule can guide the design of new ptC clusters computationally as well as experimentally. However, the counting of 18-valence electrons is not a requisite condition to contain a ptC in a cluster. Furthermore, this ptC idea is expanded to the probability of a greater coordination number of carbon in planar orientations. Unfortunately, until now, there are no such logical approaches to designing ppC, phC, or higher-coordinate carbon molecules/ions. There exist a few global minimum structures of phC clusters identified computationally, but none have been detected experimentally. All planar hypercoordinate carbon species in the global minima may be feasible in the gas phase.

Details

Language :
English
ISSN :
26248549
Volume :
4
Issue :
4
Database :
Directory of Open Access Journals
Journal :
Chemistry
Publication Type :
Academic Journal
Accession number :
edsdoj.5c05a1f9ad64ed3a57bea64c4b3b976
Document Type :
article
Full Text :
https://doi.org/10.3390/chemistry4040113