Crystallographic evidence for the presence of both (2−) and (3−) citrate species in a mixed-metal complex, [CuSb(C6H6O72−)(C6H5O7 3−)(H2O)2]·2.5H2O
1992; Elsevier BV; Volume: 11; Issue: 6 Linguagem: Inglês
10.1016/s0277-5387(00)83319-7
ISSN1873-3719
AutoresGraham Smith, Dalius S. Sagatys, R.C. Bott, D.E. Lynch, Colin H. L. Kennard,
Tópico(s)Nuclear materials and radiation effects
ResumoThe mixed-metal (CuII/SbIII) complex with citric acid, {[CuSb(C6H6O7)(C6H5 O7)(H2O)2]·2.5H2O}n, has been synthesized and its structure determined by X-ray diffraction. Each antimony is bonded to four oxygens from two α-hydroxycarboxyl moieties of two citrate residues [SbO(hydroxyl): 1.974, 2.009(5) Å; SbO(carboxyl): 2.177, 2.230(6) Å]. The second carboxyl oxygens of these groups are bonded to the axial sites of trigonal bipyramidal copper centres [CuO, 1.924, 1.928(7) Å], forming a linear polymer chain. In the equatorial sites of the trigonal bipyramid are two waters [CuO, 2.088, 2.096(6) Å] and the carboxylato oxygen of a citrato(3−) residue of an adjacent polymer chain [CuO, 2.015(5) Å]. The result is a duplex chain structure involving both citrato(2 −) and citrato(3 −) species.
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