Abstract
We perform in this work a comprehensive first-principles investigation on the geometric and electronic structures of Au(BO) −2 and Au(BS) −2 which are valent isoelectronic to the well-known Au(CN) −2 monoanion. Au(BO) −2 and Au(BS) −2 complexes prove to possess linear ground-state structures similar to Au(CN) −2 and the BO− and BS− ligands in them are found to be coordinated terminally via boron atoms to gold centers which are weakly negatively charged. Au–B bonds in Au(BO) −2 and Au(BS) −2 appear to have higher Wiberg bond indices (0.79 and 0.80) and more covalent components (60 and 53 %) than the corresponding values of Au–C interaction in Au(CN) −2 (0.67 and 39 %, respectively) at the same theoretical levels. Their Au–B bifurcation values of the electronic localization function also turn out to be higher than Au–C. These results strongly suggest that the Au–B bonds in Au(BO) −2 and Au(BS) −2 with multiple-bond character possess stronger covalent characters than Au–C in Au(CN) −2 .
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Acknowledgments
This work was jointly supported by the National Natural Science Foundation of China (Grant No. 20873117) and Shanxi Science Foundation (No. 2010011012-3). SDL sincerely thanks Prof. Jun Li at Tsinghua University for inspiration discussions on the project.
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Miao, CQ., Lu, HG. & Li, SD. Covalent Bonding in Au(BO) −2 and Au(BS) −2 . J Clust Sci 24, 233–241 (2013). https://doi.org/10.1007/s10876-012-0546-z
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DOI: https://doi.org/10.1007/s10876-012-0546-z