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[Ag7(H){S2CC(CN)2}6]6−: An Anionic Heptanuclear Silver Hydride Cluster Compound Stabilized by Dithiolate Ligands

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Abstract

In our attempts to identify probable intermediates in the preparation of anionic silver hydride cluster [Ag8(H){S2CC(CN)2}6]5− under the condition of excess NaBH4, we isolated and analyzed a new cluster compound, namely, [Bu4N]6[Ag7(H){S2CC(CN)2}6]. We report here the synthesis, crystal structure, characterizations by various spectroscopic (UV–Vis, IR, multinuclear NMR, elemental analyses) techniques and the luminescent properties of this cluster. Its X-ray crystal structure reveals that the cluster contains a distorted; tricapped tetrahedral silver core enclosed an interstitial hydride anion and is surrounded by six 1,1-dicyanoethylene-2,2-dithiolate ([S2CC(CN)2]2−, i-MNT) ligands. The presence of hydride inside the heptanuclear silver cluster is unequivocally certified by both 1H and 109Ag NMR spectroscopies. The title compound represents the first atomic precisely anionic Ag7-H skeleton with a non-disordered, tricapped tetrahedral silver framework.

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Acknowledgements

This research was supported by Ministry of Science and Technology of Taiwan (MOST 106-2113-M-259-010). This work was also supported by the National Natural Science Foundation of China (Grand. No. 21601097) and the National First-rate Discipline Construction Project of Ningxia (Chemical Engineering & Technology, NXYLXK2017A04).

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Authors and Affiliations

  1. Department of Chemistry, National Dong Hwa University, Hualien, 97401, Taiwan, ROC

    Ping-Kuei Liao, Ching-Shiang Fang & C. W. Liu

  2. Ningxia Key Laboratory for Photovoltaic Materials, Ningxia University, Yin-Chuan, 750021, People’s Republic of China

    Kuan-Guan Liu

  3. School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210009, Jiangsu, People’s Republic of China

    Kuan-Guan Liu

  4. Material and Chemical Research Laboratories, Industrial Technology Research Institute, Hsinchu, 31040, Taiwan, ROC

    Ying-Yann Wu

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  1. Ping-Kuei Liao
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  5. C. W. Liu
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Liao, PK., Liu, KG., Fang, CS. et al. [Ag7(H){S2CC(CN)2}6]6−: An Anionic Heptanuclear Silver Hydride Cluster Compound Stabilized by Dithiolate Ligands. J Clust Sci 30, 1185–1193 (2019). https://doi.org/10.1007/s10876-019-01538-3

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