Mercury polycations

Mercury polycations are polyatomic cations that contain only mercury atoms. The best known example is the Hg2+
2 ion, found in mercury(I) (mercurous) compounds. The existence of the metal–metal bond in Hg(I) compounds was established using X-ray studies in 1927[2] and Raman spectroscopy in 1934[3] making it one of the earliest, if not the first, metal–metal covalent bonds to be characterised.

Other mercury polycations are the linear Hg2+
3 and Hg2+
4 ions,[3] and the triangular Hg4+
3 ion [4] and a number of chain[5] and layer polycations.[6]

  1. ^ Cutforth, Brent D.; Gillespie, Ronald J.; Ireland, Peter; Sawyer, Jeffery F.; Ummat, P. K. (1983). "Preparation and Crystal Structure of Tetramercury Bis(hexafluoroarsenate) [Hg4](AsF6)2". Inorganic Chemistry. 22 (9): 1344–1347. doi:10.1021/ic00151a015.
  2. ^ Wells, A. F. (1962). Structural Inorganic Chemistry (3rd ed.). Oxford Science Publications.
  3. ^ a b Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. doi:10.1016/C2009-0-30414-6. ISBN 978-0-08-037941-8.
  4. ^ Brodersen, K.; Göbel, G.; Liehr, G. (1989). "Terlinguait Hg4O2Cl2 - ein Mineral mit ungewöhnlichen Hg3-Baueinheiten". Zeitschrift für anorganische und allgemeine Chemie (in German). 575 (1). Wiley: 145–153. doi:10.1002/zaac.19895750118. ISSN 0044-2313.
  5. ^ I. David Brown, Brent D. Cutforth, Colin G. Davies, Ronald J. Gillespie, Peter R. Ireland, and John E. Vekris (1974). "Alchemists' Gold, Hg2.86 AsF6; An X-Ray Crystallographic Study of A Novel Disordered Mercury Compound Containing Metallically Bonded Infinite Cations". Can. J. Chem. 52 (5): 791–793. doi:10.1139/v74-124. S2CID 93164215.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  6. ^ Brown, I. D.; Gillespie, R. J.; Morgan, K. R.; Tun, Z.; Ummat, P. K. (1984). "Preparation and crystal structure of mercury hexafluoroniobate (Hg
    3    NbF
    6    ) and mercury hexafluorotantalate (Hg
    3    TaF
    6    ): mercury layer compounds". Inorganic Chemistry. 23 (26): 4506–4508. doi:10.1021/ic00194a020.
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