Abstract
Several noble-gas-containing molecules XNgY were observed experimentally. However, the bonding in such systems is still not understood. Using natural bond orbital and natural resonance theory (NBO/NRT) methods, the present work investigated bonding of the title molecules. The results show that each of the studied XNgY molecules should be better described as a resonance hybrid of ω-bonding and \( \widehat{\sigma} \)-type long-bonding structures: X:− Ng+ − Y, X − Ng+: Y−, and X^Y. The ω-bonding and long-bonding make competing contributions to the composite resonance hybrid due to the accurately preserved bond order conservation principle. We find that the resonance bonding is highly tunable for these noble-gas-containing molecules due to its dependence on the nature of the halogen X or the central noble-gas atoms Ng. When the molecule XNgY consists of a relatively lighter Ng atom, a relatively low-electronegative X atom, and the CN fragment rather than NC, the long-bonding structure X^Y tends to be highlighted. In contrast, the heavy Ng atom and high-electronegative X atom will enhance the ω-bonding structure. Overall, the present work provides electronic principles and chemical insights that help understand the bonding in these XNgY species.
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Acknowledgments
This work was supported by the Natural Science Foundation of Shandong Province (No. ZR2015BM025). We thank Professor Frank Weinhold of the University of Wisconsin-Madison for his continuous help.
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Song, J., Su, Y., Jia, Y. et al. Resonance bonding in XNgY (X = F, Cl, Br, I; Ng = Kr or Xe; Y = CN or NC) molecules: an NBO/NRT investigation. J Mol Model 24, 129 (2018). https://doi.org/10.1007/s00894-018-3665-0
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DOI: https://doi.org/10.1007/s00894-018-3665-0