Preparation, structural characterization and properties of malonamato(−1) complexes

Vansant, Christoffel; Desseyn, H. O.; Tangoulis, Vassilis; Raptopoulou, Catherine P.; Terzis, Aris; Perlepes, Spyros P.

doi:10.1016/0277-5387(95)00021-j

Cited by 21 publications

(3 citation statements)

References 46 publications

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“…The rhombicity value, g 1 ± g 2 = 6.14, is fairly large and reflects a significant asymmetry in the equatorial plane of Co(II) [29]. These g-values are in the range of those observed in similar high-spin octahedral Co(II) complexes, such as trans-[Co II (malonamato) 2 (H 2 O) 2 ] [30]. Characteristic of the EPR signal of 1 is the presence of a broad feature slightly over 200 mT, which grows as the temperature of the spectrum decreases, resolves below 35 K, and reaches maximum intensity at 19 K. The line shapes are mostly dominated by the unresolved hyperfine interactions and by a distribution of E/D, where D and E describe the axial and rhombic zero-field splitting (ZFS) constants, respectively.…”

Section: Electron Paramagnetic Resonancementioning

confidence: 79%

Dynamic relaxometry: application to iron uptake by ferritin

Herynek

Bulte²,

Douglas

et al. 2000

J Biol Inorg Chem

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Citric acid represents a class of carboxylic acids present in biological fluids and playing key roles in biochemical processes in bacteria and humans. Its ability to promote diverse coordination chemistries in aqueous media, in the presence of metal ions known to act as trace elements in human metabolism, earmarks its involvement in a number of physiological functions. Cobalt is known to be a central element of metabolically important biomolecules, such as B12, and therefore its biospeciation in biological fluids constitutes a theme worthy of chemical and biological perusal. In an effort to unravel the aqueous chemistry of cobalt in the presence of a physiologically relevant ligand, citrate, the first aqueous, soluble, mononuclear complex has been synthesized and isolated from reaction mixtures containing Co(II) and citrate in a 1:2 molar ratio at pH approximately 8. The crystalline compound (NH4)4[Co(C6H5O7)2] (1) has been characterized spectroscopically (UV/vis, EPR) and crystallographically. Its X-ray structure consists of a distorted octahedral anion with two citrate ligands fulfilling the coordination requirements of the Co(II) ion. The magnetic susceptibility measurements of 1 in the range from 6 to 295 K are consistent with a high-spin complex containing Co(II) with a ground state S=3/2. Corroborating this result is the EPR spectrum of 1, which shows a signal consistent with the presence of a Co(II) system. The spectroscopic and structural properties of the complex signify its potential biological relevance and participation in speciation patterns arising under conditions consistent with those employed for its synthesis and isolation.

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Section: Electron Paramagnetic Resonancementioning

confidence: 79%

Dynamic relaxometry: application to iron uptake by ferritin

Herynek

Bulte²,

Douglas

et al. 2000

J Biol Inorg Chem

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“…Owing to the presence of two different types of amide groups in 1 and 2, two m(C@O) and two [30]. The IR spectra of 1 and 2 are almost identical, suggesting that these complexes have similar structures.…”

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confidence: 86%

The succinamate(−1) ligand in 4f-metal chemistry: First example of amide coordination in the double-chain 1D coordination polymer catena-aquatris(succinamato(−1))erbium(III)

Messimeri

Nastopoulos

Terzis

et al. 2005

Inorganic Chemistry Communications

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“…Complexes 1a, 1b and 2-4 were characterized by vibrational spectroscopy [16]. IR assignments of some diagnostic bands (Table 1) have been given in comparison with the data obtained for lithium succinate (assumed to contain a ÔfreeÕ carboxylate group) [16], oxamato()1) ( À OOC-CONH 2 ) [17] and malonamato()1) ( À OOC-CH 2 -CONH 2 ) [18] complexes; they have also been assisted by NH/ND and OH/OD isotopic substitutions [16]. The typical bands of the neutral amide group (m as (NH 2 ), m s (NH 2 ), m(C@O), m(CN)) are situated at approximately the same frequencies in the spectra of the complexes compared to those in the spectrum of LiLH, confirming the non-participation of the amide group in coordination.…”

mentioning

confidence: 99%