Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 22, Issue 36, Pages 20362-20367Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0cp03703f
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Funding
- Natural Science Foundation of Shanxi Province [2018103]
- Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi [2019L0828]
- Natural Science Foundation of Xinzhou Teachers University [201711]
- Fund for Shanxi 1331 Project Key Subjects Construction
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The typical electron-deficiency of the boron element renders fascinating architectures and chemical bonding to boron-based nanoclusters. We theoretically predict two di-Ca-doped boron clusters, B6Ca2(D-2h,(1)A(g)) and B8Ca2(D-8h,(1)A(1g)), and both adopt interesting inverse sandwich geometries, showing an elongatedD(2h)B(6)or perfectly planarD(8h)B(8)ring being sandwiched by two Ca atoms only, respectively. Natural atomic charge analyses indicate that the Ca atoms donate nearly all the 4s electrons to the B-6(or B-8) ring, forming [Ca](2+)[B-6](4-)[Ca](2+)and [Ca](2+)[B-8](4-)[Ca](2+)charge transfer complexes. The interaction between the two Ca atoms and the boron rings is governed by robust electrostatics albeit by weaker B-Ca covalent interaction. Chemical bonding analyses show that B(6)Ca(2)has 4 sigma and 6 pi delocalized electrons on the elongated B(6)ring, leading to a conflicting aromatic system. B8Ca2, possessing 6 sigma and 6 pi delocalized electrons on the B(8)ring, is doubly aromatic. Additionally, the B(6)Ca(2)and B(8)Ca(2)clusters show noticeable structural and electronic transmutation relative to their equivalent electronic B(6)Be(2)and B(8)Mg(2)clusters, respectively. The intrinsic reasons behind the transmutations are elucidatedviain-depth bonding analyses.
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