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Issue 42, 2009
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Experimental and theoretical investigations of CB8: towards rational design of hypercoordinated planar chemical species

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Abstract

We demonstrated in our joint photoelectron spectroscopic and ab initio study that wheel-type structures with a boron ring are not appropriate for designing planar molecules with a hypercoordinate central carbon based on the example of CB8, and CB8clusters. We presented a chemical bonding model, derived from the adaptive natural density partitioning analysis, capable of rationalizing and predicting planar structures either with a boron ring or with a carbon atom occupying the central hypercoordinate position. According to our chemical bonding model, in the wheel-type structures the central atom is involved in delocalized bonding, while peripheral atoms are involved in both delocalized bonding and two-center two-electron (2c–2e) σ-bonding. Since carbon is more electronegative than boron it favors peripheral positions where it can participate in 2c–2e σ-bonding. To design a chemical species with a central hypercoordinate carbon atom, one should consider electropositive ligands, which would have lone pairs instead of 2c–2e peripheral bonds. Using our extensive chemical bonding model that considers both σ- and π-bonding we also discuss why the AlB9 and FeB9 species with octacoordinate Al and Fe are the global minima or low-lying isomers, as well as why carbon atom fits well into the central cavity of CAl42 and CAl5+. This represents the first step toward rational design of nano- and subnano-structures with tailored properties.

Graphical abstract: Experimental and theoretical investigations of CB8−: towards rational design of hypercoordinated planar chemical species

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Publication details

The article was received on 06 May 2009, accepted on 28 Jul 2009 and first published on 09 Sep 2009


Article type: Paper
DOI: 10.1039/B908973J
Citation: Phys. Chem. Chem. Phys., 2009,11, 9840-9849
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    Experimental and theoretical investigations of CB8: towards rational design of hypercoordinated planar chemical species

    B. B. Averkiev, L. Wang, W. Huang, L. Wang and A. I. Boldyrev, Phys. Chem. Chem. Phys., 2009, 11, 9840
    DOI: 10.1039/B908973J

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