Abstract
It is well-established that many covalently-bonded atoms of Groups IV–VII have directionally-specific regions of positive electrostatic potential (σ-holes) through which they can interact with negative sites. In the case of Group VII, this is called “halogen bonding.” We have studied two series of molecules: the F3MX and, for comparison, the H3MX (M = C, Si and Ge; X = F, Cl, Br and I). Our objective was to determine how the interplay between M and X in each molecule affects the σ-holes of both, and consequently their interactions with the nitrogen lone pair of HCN. We find that the relative electronegativities of M and X are not sufficient to explain their effects upon each other’s σ-holes; consideration of charge capacity/polarizability (and perhaps other factors) also appears to be necessary. However the results do support the description of normal σ-hole interactions as being largely electrostatically-driven.
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The facilities at the University of Mauritius are acknowledged.
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Bundhun, A., Ramasami, P., Murray, J.S. et al. Trends in σ-hole strengths and interactions of F3MX molecules (M = C, Si, Ge and X = F, Cl, Br, I). J Mol Model 19, 2739–2746 (2013). https://doi.org/10.1007/s00894-012-1571-4
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DOI: https://doi.org/10.1007/s00894-012-1571-4