Structural changes in the series of boron-carbon mixed clusters CxB10-x− (x = 3-10) upon substitution of boron by carbon

We report a theoretical investigation on the ten-atom boron-carbon mixed clusters CxB10 − x− (x = 3-10), revealing a molecular wheel to monocyclic ring and linear species structural change as a function of x upon increasing the number of carbon atoms in the studied series. The unbiased searches for...

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Veröffentlicht in:The Journal of chemical physics 2013-09, Vol.139 (11)
Hauptverfasser: Popov, Ivan A., Popov, Valery F., Bozhenko, Konstantin V., Černušák, Ivan, Boldyrev, Alexander I.
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container_issue 11
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container_title The Journal of chemical physics
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creator Popov, Ivan A.
Popov, Valery F.
Bozhenko, Konstantin V.
Černušák, Ivan
Boldyrev, Alexander I.
description We report a theoretical investigation on the ten-atom boron-carbon mixed clusters CxB10 − x− (x = 3-10), revealing a molecular wheel to monocyclic ring and linear species structural change as a function of x upon increasing the number of carbon atoms in the studied series. The unbiased searches for the global minimum structures of the clusters with x ranging from 3 to 9 were conducted using the Coalescence Kick program for different spin multiplicities. Subsequent geometry optimizations with follow-up frequency calculations at the hybrid density functional B3LYP/6-311+G(d) level of theory along with the single point coupled-cluster calculations (UCCSD(T)/aug-cc-pVTZ//B3LYP/6-311+G(d) and RCCSD(T)/aug-cc-pVTZ//B3LYP/6-311+G(d)) revealed that the C3B7− and C4B6− clusters possess planar distorted wheel-type structures with a single inner boron atom, similar to the recently reported CB9− and C2B8−. Going from C5B5− to C9B− inclusive, monocyclic and ring-like structures are observed as the most stable ones on the PES. The first linear species in the presented series is found for the C10− cluster, which is almost isoenergetic with the one possessing a monocyclic geometry. The classical 2c-2e σ bonds are responsible for the peripheral bonding in both carbon- and boron-rich clusters, whereas multicenter σ bonding (nc-2e bonds with n > 2) on the inner fragments in boron-rich clusters is found to be the effective tool to describe their chemical bonding nature. It was shown that the structural transitions in the CxB10-x− series occur in part due to the preference of carbon to form localized bonds, which are found on the periphery of the clusters. Chemical bonding picture of C10− is explained on the basis of the geometrical structures of the C10 and C102− clusters and their chemical bonding analyses.
doi_str_mv 10.1063/1.4820878
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The unbiased searches for the global minimum structures of the clusters with x ranging from 3 to 9 were conducted using the Coalescence Kick program for different spin multiplicities. Subsequent geometry optimizations with follow-up frequency calculations at the hybrid density functional B3LYP/6-311+G(d) level of theory along with the single point coupled-cluster calculations (UCCSD(T)/aug-cc-pVTZ//B3LYP/6-311+G(d) and RCCSD(T)/aug-cc-pVTZ//B3LYP/6-311+G(d)) revealed that the C3B7− and C4B6− clusters possess planar distorted wheel-type structures with a single inner boron atom, similar to the recently reported CB9− and C2B8−. Going from C5B5− to C9B− inclusive, monocyclic and ring-like structures are observed as the most stable ones on the PES. The first linear species in the presented series is found for the C10− cluster, which is almost isoenergetic with the one possessing a monocyclic geometry. The classical 2c-2e σ bonds are responsible for the peripheral bonding in both carbon- and boron-rich clusters, whereas multicenter σ bonding (nc-2e bonds with n &gt; 2) on the inner fragments in boron-rich clusters is found to be the effective tool to describe their chemical bonding nature. It was shown that the structural transitions in the CxB10-x− series occur in part due to the preference of carbon to form localized bonds, which are found on the periphery of the clusters. 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The classical 2c-2e σ bonds are responsible for the peripheral bonding in both carbon- and boron-rich clusters, whereas multicenter σ bonding (nc-2e bonds with n &gt; 2) on the inner fragments in boron-rich clusters is found to be the effective tool to describe their chemical bonding nature. It was shown that the structural transitions in the CxB10-x− series occur in part due to the preference of carbon to form localized bonds, which are found on the periphery of the clusters. 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The classical 2c-2e σ bonds are responsible for the peripheral bonding in both carbon- and boron-rich clusters, whereas multicenter σ bonding (nc-2e bonds with n &gt; 2) on the inner fragments in boron-rich clusters is found to be the effective tool to describe their chemical bonding nature. It was shown that the structural transitions in the CxB10-x− series occur in part due to the preference of carbon to form localized bonds, which are found on the periphery of the clusters. Chemical bonding picture of C10− is explained on the basis of the geometrical structures of the C10 and C102− clusters and their chemical bonding analyses.</abstract><doi>10.1063/1.4820878</doi></addata></record>
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title Structural changes in the series of boron-carbon mixed clusters CxB10-x− (x = 3-10) upon substitution of boron by carbon
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