The Full Wiki

More info on Low valent magnesium compounds

Low valent magnesium compounds: Wikis


Note: Many of our articles have direct quotes from sources you can cite, within the Wikipedia article! This article doesn't yet, but we're working on it! See more info or our list of citable articles.


From Wikipedia, the free encyclopedia

Two low valent magnesium compounds have been discovered that are the first examples of stable magnesium(I) compounds.[1] Both examples have the formula L2Mg2, where L represents a bulky anionic ligand.[1] X-ray crystallographic studies show an Mg-Mg bond length of 285.1 pm and 284.6 pm.[1] Theoretical studies indicate an essentially ionic formulation Mg22+(L)2.[1] The Mg22+ ion is the group 2 analogue of the group 12 Hg22+ (present in e.g. mercury(I) chloride) and Cd22+ ions (present in cadmium(I) tetrachloroaluminate). The preparation involved the reduction of MgII iodine complexes with potassium metal and the bulky ligands were[1]:

  • a guanidinate, "priso", [(Ar)NC(NPri2)N(Ar)] where Ar = 2,6-diisopropylphenyl and Pri = iso-propyl
  • a ketiminate, "nacnac", {[(Ar)NC(Me)]2CH},- where Ar = 2,6-diisopropylphenyl and Me = methyl

The chemistry of Mg is dominated by the +2 oxidation state and up to this point the ternary metal hydrides Mg2RuH4, Mg3RuH3, and Mg4IrH5 and magnesium diboride[2], MgB2 with short Mg-Mg bonds (293 pm, 303 pm, 275 pm, 308pm respectively)[2] [3] had been assumed to contain an Mg2 unit. Calculations had also indicated the stability of the Mg22+ cation[4]


  1. ^ a b c d e Green, S. P.; Jones C.; Stasch A. (December 2007). "Stable Magnesium(I) Compounds with Mg-Mg Bonds". Science 318 (5857): 1754–1757. doi:10.1126/science.1150856.  
  2. ^ a b King, R. Bruce (October 2002). "Chemical bonding topology of superconductors. 5. The similarities between magnesium diboride and cuprate superconductors and the role of subvalent magnesium". Polyhedron 21 (23): 2347–2350. doi:10.1016/S0277-5387(02)01183-X.  
  3. ^ R. Bruce King,(1994),"Hydrides: Solid state transition metal complexes" in Encyclopedia of Inorganic chemistry,John Wiley & Sons, ISBN 0471936200
  4. ^ .Hogreve, H. (August 2004). "Mg22+: a long-lived metastable dication". Chemical Physics Letters 394 (1-3): 32–36. doi:10.1016/j.cplett.2004.06.099.  


Got something to say? Make a comment.
Your name
Your email address