The dimeric Zintl ion [Hg2(As7)2]4− has been synthesized with high crystalline yield from the reaction of an ethylendiamine solution of the intermetallic Zintl phase K3As7 with diphenyl mercury. Single crystal X-ray diffraction of [K(2,2,2-crypt)]4[Hg2As14], 1 (2,2,2-crypt = 4,7,13,16,21,24-hexaoxa-1,10-diazabicyclo[8.8.8]-hexacosane), reveals that the cluster anion exhibits a Hg–Hg bond and the compound has been further characterized using Raman spectroscopy, cyclic voltammetry and its band gap energy was measured. Theoretical studies provide a microscopic understanding of the bonding in this unusual compound.
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