Low valent magnesium compounds

Low valent magnesium compounds

Two low valent magnesium compounds have been discovered that are the first examples of stable magnesium(I) compounds.cite journal
last= Green
first= S. P.
authorlink=
coauthors= Jones C.; Stasch A.
year= 2007
month= December
title= Stable Magnesium(I) Compounds with Mg-Mg Bonds
journal= Science
volume= 318
issue= 5857
pages= 1754 - 1757
doi= 10.1126/science.1150856
id=
url=
accessdate=
quote= ] Both examples have the formula L2Mg2, where L represents a bulky bidentate anionic ligand. X-ray crystallographic studies show an Mg-Mg bond length of 285.1 pm and 284.6 pm. Theoretical studies indicate an essentially ionic formulation Mg22+(L−)2. 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:
* 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 diboridecite journal
last= King
first= R. Bruce
authorlink=
coauthors=
year= 2002
month= October
title= Chemical bonding topology of superconductors. 5. The similarities between magnesium diboride and cuprate superconductors and the role of subvalent magnesium
journal= Polyhedron
volume= 21
issue= 23
pages= 2347-2350
doi= 10.1016/S0277-5387(02)01183-X
id=
url=
accessdate=
quote= ] , MgB2 with short Mg-Mg bonds (293 pm, 303 pm, 275 pm, 308pm respectively) [R. Bruce King,(1994),"Hydrides: Solid state transition metal complexes" in Encyclopedia of Inorganic chemistry,John Wiley & Sons, ISBN 0471936200] had been assumed to contain an Mg2 unit. Calculations had also indicated the stability of the Mg22+ cation [.cite journal
last= Hogreve
first= H.
authorlink=
coauthors=
year= 2004
month= August
title= Mg22+: a long-lived metastable dication
journal= Chemical Physics Letters
volume= 394
issue= 1-3
pages= 32-36
doi= 10.1016/j.cplett.2004.06.099
id=
url=
accessdate=
quote= ]

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