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Issue 9, 2016
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A niobium-necked cluster [As3Nb(As3Sn3)]3− with aromatic Sn32−

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We describe here the synthesis and characterization of a ternary cluster compound [As3Nb(As3Sn3)]3− (1), in which a niobium(V) atom is coordinated by an As33− triangle and a bowl-type As3Sn35− ligand. Cluster 1 was synthesized by dissolving K8NbSnAs5 (2) in the presence of [2.2.2]crypt in ethylenediamine solution, filtered and layered with toluene, then crystallized in the form of [K([2.2.2]crypt)]3[As3Nb(As3Sn3)]·en·tol. The flower-vase shaped compound 1 features a new structure type, rather different from the known Zintl phases. The stability and bonding of 1 are elucidated via extensive bonding analyses. The Sn3 ring is found to have σ-aromaticity featuring a delocalized Sn–Sn–Sn σ bond. Electronic structure calculations confirm the Nb(V) oxidation state and weak Nb–Sn and Sn–Sn bonding, in addition to the normal Nb–As and As–As bonds.

Graphical abstract: A niobium-necked cluster [As3Nb(As3Sn3)]3− with aromatic Sn32−

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The article was received on 04 Jan 2016, accepted on 19 Jan 2016 and first published on 21 Jan 2016

Article type: Paper
DOI: 10.1039/C6DT00028B
Citation: Dalton Trans., 2016,45, 3874-3879
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    A niobium-necked cluster [As3Nb(As3Sn3)]3− with aromatic Sn32−

    F. Pan, C. Xu, L. Li, X. Min, J. Wang, J. Li, H. Zhai and Z. Sun, Dalton Trans., 2016, 45, 3874
    DOI: 10.1039/C6DT00028B

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