Relationship between Oxo-Bridged Dimer Formation and Structure of Vanadium(III) amino polycarboxylates

Kanamori, Kan; Ino, Kazuhito; Maeda, Haruyo; Miyazaki, Keisuke; Fukagawa, M.; Kumada, Junko; Eguchi, Taro; Okamoto, Ken‐ichi

doi:10.1021/ic00102a032

Cited by 32 publications

(20 citation statements)

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“…Electronic absorption spectroscopic studies of aminocarboxylate complexes of V(III) have been previously reported in detail by Meier [29]. These workers have all pointed out that diffuse reflectance spectra in the solid state for these complexes are essentially the same as in solution.…”

Section: Electronic Absorption Spectroscopymentioning

confidence: 92%

“…in which all of the donor atoms of the ligand are coordinated, which presumably corresponds to the crystal structure [25], and another six-coordinate complex, [V(trdta)(H 2 O)] À in which one pendant carboxylate arm is not coordinated with a water ligand taking up this site [29]. In addition to the equilibrium in solution between these two species, and conformational effects of the propane linker group (see below), the hydroxo complex, [V(trdta) (OH)] 2À and the dinuclear oxo-bridged complex, [V 2 (trdta) 2 (l-O)] 4À can form at higher pH values.…”

Section: Electronic Absorption Spectroscopymentioning

confidence: 99%

“…Kanamori et al [29] have also employed a variety of other techniques to study aminocarboxylate complexes of V(III), such as spin-lattice relaxation time by 1 H NMR, and resonance Raman spectroscopy as well as UV-Vis as a function of pH, all of which demonstrated that [V(edta)(H 2 O)] À in solution maintains the same species from pH 1.8 to 7.5. An equilibrium between [V(edta)(H 2 O)] À and [V(edta)(OH)] À is present in solution above pH 7.5; however, in our solution HFEPR studies the pH was always kept below this value.…”

Section: Electronic Absorption Spectroscopymentioning

confidence: 99%

See 2 more Smart Citations

Aminocarboxylate complexes of vanadium(III): Electronic structure investigation by high-frequency and -field electron paramagnetic resonance spectroscopy

Telser

Chen

et al. 2009

Journal of Inorganic Biochemistry

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Section: Electronic Absorption Spectroscopymentioning

confidence: 92%

Section: Electronic Absorption Spectroscopymentioning

confidence: 99%

Section: Electronic Absorption Spectroscopymentioning

confidence: 99%

See 1 more Smart Citation

Aminocarboxylate complexes of vanadium(III): Electronic structure investigation by high-frequency and -field electron paramagnetic resonance spectroscopy

Telser

Chen

et al. 2009

Journal of Inorganic Biochemistry

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“…both S,S-or both R,R-), only one arrangement, that with the five-membered rings in the axial positions and the six-membered rings in the equatorial positions has been observed. 16,17,19,20 This is a result of excessive strain energy associated with having the five-membered rings in equatorial positions. 16,18,20 As a result, all homochiral EDDS complexes are diastereomerically pure; the chirality of the ligand is expressed perfectly in the absolute configuration of the metal atom such that e.g.…”

Section: Edds (Edds 5 Nn-ethylenediaminedisuccinic Acid)mentioning

confidence: 99%

A new reference material for UV–visible circular dichroism spectroscopy

Damianoglou¹,

Crust²,

Hicks³

et al. 2008

Chirality

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To obtain accurate and consistent measurements from circular dichroism (CD) instruments over time and from different laboratories, it is important that they are properly calibrated. The characteristics of the available reference materials are not ideal to ensure proper calibration as they typically only give peaks in one or two spectral regions, and often have issues concerning purity and stability. Currently either camphor sulfonic acid or ammonium camphor sulfonate are used. The latter can be an unstable, slightly hygroscopic secondary standard compound with only one characterized CD band. The former is the very hygroscopic primary standard for which only one enantiomer is readily available. We have synthesized a new reference material for CD, Na[Co(EDDS)].H(2)O (EDDS = N,N-ethylenediaminedisuccinic acid) which addresses these problems. It is extremely stable and available in both enantiomeric forms. The CD spectrum of Na[Co(EDDS)].H(2)O has nine distinct peaks between 180 and 599 nm. It thus fulfils the principal requirements for CD calibration chemical standards and has the potential to be used to ensure good practice in the measurement of CD data, providing two spectra of equal magnitude and opposite sign for a given concentration and path length. We have carried out an interlaboratory comparison using this material and show how it can be used to improve CD comparability between laboratories. A fitting algorithm has been developed to assess CD spectropolarimeter performance between 750 and 178 nm. This could be the basis of a formal quality control process once criteria for performance have been decided.

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“…Conversely, the ligands that form six-membered chelate rings such as 1,3-propanediamine-N,N,N',N'-tetraacetate (1,3-pdta) [4] and N,N-bis(carboxymethyl)--alanate ( -alada) [5] yield hexacoordinate mononuclear vanadium(III) complexes. Hexacoordinate mononuclear vanadium(III) produces an oxobridged dinuclear complex upon base hydrolysis, whereas heptacoordinate vanadium(III) complexes do not [5,6]. In acidic solution, the substitution of acetate group(s) in nta by 2-pyridylmethyl group(s) results in the formation of a hexacoordinate mononuclear species.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Structures of Vanadium(III) and -(IV) Complexes with a Tripodal Quadridentate Ligand Containing Alcoholic and Pyridyl or Imidazolyl Functionality

Kanamori¹,

Fujimoto²,

Yoneda³

et al. 2008

TOICJ

Self Cite

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Abstract:Complexes of vanadium(III) and vanadium(IV) were synthesized with the tripodal quadridentate ligands, N,Nbis(2-pyridylmethyl)-2-aminoethanol (Hbpmae) and N,N-bis(2-imidazolylmethyl)-2-aminoethanol (Hbimae). The chemical structures and geometries were determined by X-ray crystallography or spectral measurements. Vanadium(III) formed structurally similar, oxo-bridged, dinuclear complexes with both ligands and exhibited intense absorption bands in the visible region. Upon exposure to air, the vanadium(III) complexes oxidized spontaneously, yielding the respective vanadium(IV) complexes. The geometry of the vanadium(IV)-Hbpmae complex was very similar to that of the monomeric unit in the corresponding vanadium(III) dimer. The alkoxo group in all four complexes coordinated to a metal center in a protonated form. The geometrical arrangements of the vanadium(IV)-Hbpmae and -Hbimae complexes were different with each other. The intense absorption bands in the visible region of the oxo-bridged dinuclear vanadium(III) complexes were assigned based on molecular orbital calculation.

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Relationship between Oxo-Bridged Dimer Formation and Structure of Vanadium(III) amino polycarboxylates

Cited by 32 publications

References 5 publications

Aminocarboxylate complexes of vanadium(III): Electronic structure investigation by high-frequency and -field electron paramagnetic resonance spectroscopy

Aminocarboxylate complexes of vanadium(III): Electronic structure investigation by high-frequency and -field electron paramagnetic resonance spectroscopy

A new reference material for UV–visible circular dichroism spectroscopy

Synthesis and Structures of Vanadium(III) and -(IV) Complexes with a Tripodal Quadridentate Ligand Containing Alcoholic and Pyridyl or Imidazolyl Functionality

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