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The Hg(II) complexes of the N,N,N′,N′ -tetraacetate of 1,2-deaminoethane (edta) and 1,4-diaminobutane (teta) were crystallized from concentrated aqueous solutions. The first ligand gave crystals of Li 4 Hg 2 (edta) 2 ] · 8H 2 O. Its single crystal X-ray structure determination (triclinic space group P ¯ with a = 9.369)(3), b = 9.354(3), c = 11.584(4) A, α = 67.90(2), β = 67.50(2), γ = 80.42(3)° and Z = 1) showed that each mercury(II) is mainly bound to six donor atoms of the same ligand anion. The coordinated anionic is strained and leaves sufficient space for a seventh donor atom, i.e. a coordinated oxygen atom of the nearest complex ion bound with a much shorter Hg-O distance. The second ligand gave Ba 2 [Hg 2 (teta) 2 ] · 9H 2 O (space group C / c with a = 17.840(2), b = 15.243(2), c = 18.962(6), β = 113.84(1)° and Z = 4) containing two equivalent ligand anions giving the simplest polymeric structure, i.e. a dimer. These results are in agreement with the data obtained from equilibrium studies. |
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