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In this work, we report the synthesis and characterization of two novel Ru-containing Zintl clusters: [Sn19{Ru(COD)(en)}2]4− and [Sn20{Ru(COD)}2]6−. The synthesized compounds not only expand the family of Ru-Sn cluster systems but also shed light on the structure of heterometallic complexes in a previously unknown range of tin atoms. The single-crystal X-ray diffraction (XRD) analysis reveals the dimeric nature of the clusters. Two different assembly patterns of the formal [Sn(η3−Sn9)] monomer were observed: the dimerization through the vertex fusion process and the direct dimerization through the formation of 2c–2e Sn-Sn σ-bond. For both clusters, the density functional theory calculations reveal the locally σ-aromatic nature of the [Sn(η3−Sn9)] monomer resulting in two independent magnetic shielding cones. We believe that our findings will help the community to further explore the fascinating chemistry of polystannide clusters. [ABSTRACT FROM AUTHOR]

In this work, we synthesize naked tin cluster anion Sn368−, representing the first example of pure Sn nanowire assembled through oxidative coupling reactions of a super atomic cluster Sn94−. Theoretical analysis confirm the presence of aromaticity for each Sn9 unit showing four adjacent aromatic subunits bridged by parallel Sn–Sn bonds. [ABSTRACT FROM AUTHOR]