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Closed Access item Thiodiacetate cobalt(II) complexes: Synthesis, structure and properties

Authors:Grirrane, Abdessamad
Pastor, Antonio
Álvarez, Eleuterio
Mealli, Carlo
Ienco, Andrea
Masi, Dante
Galindo, Agustín
Keywords:Cobalt (II), Thiodiacetate, thiodiglycolate, Crystal structure
Issue Date:23-Mar-2005
Publisher:Elsevier
Citation:Inorganic Chemistry Communications 8(5): 463-466 (2005)
Abstract:The novel cobalt thiodiacetate complex [Co(tda)(H2O)]n (1a)(tda=S(CH2COO)2-) was synthesized from the reaction of aqueous solutions of cobalt dichloride with a 1:1 mixture of Na2CO3 and thiodiacetic acid. A second isomer was also obtained occasionally and identified as complex [Co(tda)(H2O)3] (1b). The reaction of 1a with 2,2′-bipyridine (bipy) gave compound [Co(tda)(bipy)(H2O)] · 4H2O (2), which has been structurally characterized and represents, to our knowledge, the first X-ray determination of a thiodiacetate–cobalt complex. The coordination is monomeric pseudo-octahedral as determined by the typical tridentate thiodiacetate ligand with a facial configuration, the chelate bipy ligand and one water molecule. Conversely, the interaction of bis(2-pyridyl)ketone with 1a afforded the compound [Co{OC(OH)(2-pyridyl)2}2]+[Htda]− · 3H2O (3), as confirmed from an X-ray analysis. The bis(2-pyridyl)ketone ligand is hydrolyzed with a concomitant oxidation of the metal to Co(III), a process which has been previously described, while the tda ligand, displaced from the coordination sphere, is monoprotonated and acts as counterion.
Description:4 páginas, 2 figuras, 1 tabla, esquemas
Publisher version (URL):http://dx.doi.org/10.1016/j.inoche.2005.02.011
URI:http://hdl.handle.net/10261/37394
ISSN:1387-7003
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Appears in Collections:(IIQ) Artículos

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