Abstract
The potential energy surface (PES) has been explored for BSinGe4−n+ (n = 0−2) systems using density functional theory (DFT). The global minima (1a, 1b, and 1c) of the considered systems contain a planar tetracoordinate boron (ptB) center. The neutral states of the systems do not have a ptB in the global minimum structures. The designed BGe4+, BSiGe3+, and BSi2Ge2+ systems have 18 valence electrons. The CCSD(T)/aug-cc-pVTZ level of theory has been applied to compute the relative energies of the low-lying isomers with respect to the global minima. The dynamical stability of BSinGe4−n+ (n = 0−2) systems is confirmed from the atom-centered density matrix propagation (ADMP) simulation over 20 ps of time at temperatures of 300 K and 500 K. The natural charge computations show that the charges on the ptB are highly negative, indicating strong σ-acceptance from the peripheral atoms. The 1a, 1b, and 1c structures of BGe4+, BSiGe3+, and BSi2Ge2+ systems, respectively, have σ/π-dual aromaticity as predicted from the nucleus-independent chemical shift (NICS) values.
Graphical abstract
Density functional theory (DFT) based computation predicts the presence of a planar tetracoordinate boron (ptB) in the global minimum energy structures of BSinGe4−n+ (n = 0−2) systems. The systems are kinetically stable and show σ- and π- electronic delocalization.
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Acknowledgements
PKC would like to thank DST, New Delhi, India, for the J. C. Bose National Fellowship, grant number SR/S2/JCB-09/2009. PD thanks UGC, New Delhi, India, for the Research Fellowship. A part of the computation was carried out by the resources of the Supercomputing facility at the Indian Institute of Technology Kharagpur, established under the National Supercomputing Mission (NSM), Government of India and supported by the Centre for Development of Advanced Computing (CDAC), Pune.
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Dedicated to Professor S. P. Bhattacharyya on the occasion of his 75th birthday
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Das, P., Chattaraj, P.K. BSinGe4−n+ (n = 0−2): prospective systems containing planar tetracoordinate boron (ptB). J Chem Sci 135, 1 (2023). https://doi.org/10.1007/s12039-022-02121-6
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DOI: https://doi.org/10.1007/s12039-022-02121-6