A multinuclear (1H, 13C, 17O, 51V) 1D and 2D NMR study of the complexation of l-lactic acid with vanadium(V) and hydrogen peroxide shows that four peroxo complexes are formed in aqueous solution in the pH range 1-7. Two isomeric 2:2:1 (metal:ligand:peroxo) complexes, together with a 2:2:2 species, are found over the entire pH range. At pH values below 2 an additional 1:1:1 complex is formed. The acid was found in all cases to act as a bidentate ligand through the carboxylic and the adjacent hydroxyl groups. To the best of our knowledge, this is the first report of dinuclear peroxovanadium complexes in which one of the metal centres is an oxovanadium centre (2:2:1 species)

Bravic, Georges

Chasseau, Daniel

Garcia, Yann

Guionneau, Philippe

Gütlich, Philipp

Howard, Judith A. K.

Kahn, Olivier

Ksenofontov, Vadim

Reiman, Sergei

A multinuclear (1H, 13C, 17O, 51V) 1D and 2D NMR study of the complexation of l-lactic acid with vanadium(V) and hydrogen peroxide shows that four peroxo complexes are formed in aqueous solution in the pH range 1-7. Two isomeric 2:2:1 (metal:ligand:peroxo) complexes, together with a 2:2:2 species, are found over the entire pH range. At pH values below 2 an additional 1:1:1 complex is formed. The acid was found in all cases to act as a bidentate ligand through the carboxylic and the adjacent hydroxyl groups. To the best of our knowledge, this is the first report of dinuclear peroxovanadium complexes in which one of the metal centres is an oxovanadium centre (2:2:1 species).http://dx.doi.org/10.1002/1099-0682(200007)2000:7<1617::AID-EJIC1617>3.0.CO;2-

Justino, Licínia L. G.

Ramos, M. Luísa

Caldeira, M. Madalena

Gil, Victor M. S.

Estudo Geral

Peroxovanadium(V) Complexes of L-Lactic Acid as Studied by NMR Spectroscopy

A novel hexanuclear iron(III) complex [Fe&lt;sub&gt;6&lt;/sub&gt;(C&lt;sub&gt;7&lt;/sub&gt;H&lt;sub&gt;11&lt;/sub&gt;NO&lt;sub&gt;5&lt;/sub&gt;)&lt;sub&gt;6&lt;/sub&gt;(μ&lt;sub&gt;2&lt;/sub&gt;-O)&lt;sub&gt;3&lt;/sub&gt;Na][NO&lt;sub&gt;3&lt;/sub&gt;]•18H&lt;sub&gt;2&lt;/sub&gt;O has been synthesised from N-(2-hydroxypropyl)iminodiacetic acid and has been shown by X-ray crystallography to possess a prismatic structure containing a sodium ion in the core

Goodwin, Jeremy C.

Price, D.J.

Powell, Annie K.

Heath, Sarah L.

Enlighten

Alkali metal tempelated assembly of an iron trigonal prism

Crossref

A Structurally Characterised Pair of Dicobalt(III) Peroxo/Superoxo Complexes withC2-Symmetrical Tetrapodal Pentadentate Amine Ligands, and Some Reactivity en route

A novel hexanuclear iron(III) complex [Fe6(C7H11NO5)6(μ2-O)3Na][NO3]•18H2O has been synthesised from N-(2-hydroxypropyl)iminodiacetic acid and has been shown by X-ray crystallography to possess a prismatic structure containing a sodium ion in the core

Enlighten: Publications

Rare-earth salts of dodecanoic acid (lauric acid) have been prepared and characterized. The compounds have the stoichiometry Ln(C11H23COO)3, where Ln = Y, La, Ce-Lu (except Pm). The thermal behaviour of these rare-earth dodecanoates has been investigated by hot-stage polarized optical microscopy, differential scanning calorimetry (DSC), thermogravimetry (TG), and high-temperature X-ray diffraction analysis. The compounds have a lamellar bilayer structure in the solid state, with the alkyl chains in an all-trans conformation normal to the ionic sublayer. The size of the trivalent lanthanide ion has proved to be a critical factor with regard to the existence of mesophases of this type of metallomesogens bearing carboxylate ligands. Thus, it was found that a mesophase can only be formed with the light lanthanide ions having large ionic radii. The mesophase stability range decreases rapidly on traversing the lanthanide series. Whereas a smectic A phase has been observed for the LaIII, CeIII, PrIII, and NdIII dodecanoates, no mesomorphism is apparent for the other lanthanide complexes.status: publishe

Binnemans, Koen

Jongen, Liesbet

Görller-Walrand, Christiane

D'Olieslager, Willem

Hinz, Dirk

Meyer, Gerd

Lirias

European Journal of Inorganic Chemistry

Lanthanide(III) dodecanoates: Structure, thermal behaviour, and ion-size effects on the mesomorphism

Hyetrz = 4-(2prime-hydroxyethyl)-1,2,4-triazole represents the first structurally characterized iron(II) spin crossover compound for which the structure has been solved above and below room temperature in both spin states. The compound crystallizes in the trigonal system, space group R3, a = 12.763(1) &bgr;= 67.144(1), V = 1684.3(1) 3, Z = 6 at 120K. At 330K the space group is retained and a = 13.0183(3) &bgr;=67.376(3), V = 1805.8(1) 3. The molecular structure consists of trinuclear FeII entities linked together by an unprecedented three-dimensional network of hydrogen bonds. This compound shows a gradual spin crossover behavior centered around room temperature, which has been followed by temperature-dependent magnetic susceptibility measurements as well as by 57Fe M ssbauer spectroscopy. The nature of the spin crossover behavior is discussed on the basis of the structural features

DIAL UCLouvain

Synthesis, Crystal Structure, Magnetic Properties and 57Fe Mössbauer Spectroscopy of the New Trinuclear [Fe3(4-(2′-hydroxyethyl)-1,2,4-triazole)6(H2O)6](CF3SO3)6 Spin Crossover Compound

A novel hexanuclear Fe(III) complex [Fe6(Hpida)6(μ2-O)3Na][NO3]·18H2O (1; H3pida = N-(2-hydroxypropyl)iminodiacetic acid) was prepd. by reaction of equimolar amts. of N-(2-hydroxypropyl)iminodiacetic acid with iron(III) nitrate and was shown by x-ray crystallog. to possess a prismatic structure contg. a Na ion in the core. Magnetic studies showed 1 to have very strong antiferromagnetic character. [on SciFinder(R)

Peroxovanadium(V) Complexes of L-Lactic Acid as Studied by NMR Spectroscopy

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Estudo Geral

Estudo Geral

Enlighten

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Enlighten: Publications

Lirias

DIAL UCLouvain

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