Synthesis and characterization of cobalt(II) complexes of croconate and dicyanomethylene-substituted derivatives †

Dumestre, Frédéric; Soula, Brigitte; Galibert, Anne-Marie; Fabre, Paul-Louis; Bérnardinelli, Gerald; Donnadieu, Bruno; Castan, Paule

doi:10.1039/a807687a

Cited by 49 publications

(34 citation statements)

References 37 publications

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“…As shown in figure 3, the value of eff (where eff is the effective magnetic moment) of 1 at room temperature is 5.18 B , larger than the spin-only value (3.87 B ) for S ¼ 3/2 with g ¼ 2.0, but agreeing with values observed for octahedral Co II complexes with a significant first-order orbital contribution to the magnetic moment, typical of the 4 T 1g ground state [33,40,41]. The eff plot gradually decreases with decreasing temperature and reaches a minimum value of 4.30 B at 2 K, therefore Co II remains totally in the high-spin state down to 2 K and we expect an important orbital contribution in all cases.…”

Section: Magnetic Propertiessupporting

confidence: 76%

Synthesis, crystal structure, spectroscopy, and magnetism of a mixed valence Co(III)–Co(II)–Co(III) complex stabilized by N-(2-hydroxybenzyl)salicylaldimine

Yang

Wang

Tang

et al. 2010

Journal of Coordination Chemistry

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2010) Synthesis, crystal structure, spectroscopy, and magnetism of a mixed valence Co(III)-Co(II)-Co(III) complex stabilized by N-(2-hydroxybenzyl)salicylaldimine, Journal of Coordination Chemistry, 63:3, 505-514,Here, HL b is salicylaldimine, which is afforded by an in situ transformation of H 2 L a via cleavage of the C-N bond. Complex 1 has been characterized by X-ray crystallography as well as elemental analysis, UV-Vis, and IR spectroscopy. The cathodic and anodic responses of 1 in DMF appeared at À1.46 V (Co III ! Co II , quasi-irreversible) and þ0.99 V (Co II ! Co III , irreversible) versus saturated calomel electrode, respectively. The magnetic behavior of 1 has been analyzed by the one-ion approximation with spin-orbit coupling in O h symmetry giving ¼ À121 cm À1 .

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Section: Magnetic Propertiessupporting

confidence: 76%

Synthesis, crystal structure, spectroscopy, and magnetism of a mixed valence Co(III)–Co(II)–Co(III) complex stabilized by N-(2-hydroxybenzyl)salicylaldimine

Yang

Wang

Tang

et al. 2010

Journal of Coordination Chemistry

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“…The B3P86 calculated structural parameters for the lowest energy high-spin molecules are reported in Table 2 and compared to the experimental Xray data available. 22,23,49,50 From the data given in Table 2 it can be noted that the oxocarbon ring presents similar geometry for the whole series, with a short C1-C2 bond (1.39Å), two medium bonds C1-C5 and C2-C3 (~1.46Å) and two longer bond lengths for C3-C4 and C4-C5 (~1.53Å). These characteristics resemble those found for the croconate acid.…”

Section: Resultsmentioning

confidence: 99%

Molecular properties of coordination compounds of the croconate ion with first-row sivalent transition metals: a quantum mechanical study

Ferreira¹,

Santos²,

Almeida³

et al. 2007

J. Braz. Chem. Soc.

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The ground state of all complexes was found to be of high spin, in accordance with the experimental proposal. The calculated structures and vibrational frequencies were also in agreement with experiment, even though comparisons were made with the solid state structure. The calculated nonlinear optical (NLO) properties were for all the compounds analyzed, using the Time Dependent Hartree-Fock (TDHF) method within the static approach, suggesting that these transition metal complexes might be considered as lead molecules to the development of novel based-molecular materials.

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“…Several previous studies on the coordination of CR dianion with transition metal ions have been published. The crystal structure studies of metal–CR compounds have shown that CR molecules can coordinate the metal ions in different binding modes . The coordination of CA with metal ions and its interaction with metal surfaces has been less studied.…”

Section: Introductionmentioning

confidence: 99%

Chemical behavior of croconic acid coordinated to Co(II) adsorbed on silver surface

Milán‐Garcés

Georgopoulos

Sant’Ana

et al. 2018

J Raman Spectroscopy

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The vibrational properties of croconic acid (CA), the associated anionic specie croconate (CR), and their complexes with the transition metals Co(II) were investigated through surface‐enhanced Raman scattering (SERS) spectroscopy. This is the first time the SERS spectra of CA and CR are reported. The normal Raman spectrum of CA after the addition of Co(II) was similar to the corresponding spectrum of CR in the presence of Co(II), suggesting the dissociative coordination of CA with Co(II) cation. Similar behavior occurs when CA and Co(II) coadsorb on silver nanoparticle surfaces as seen by SERS spectroscopy. In the same way, the SERS spectra of CA and CR have similar spectral patterns suggesting dissociative adsorption on the metallic nanoparticle surface. The SERS spectra of CR show changes with both concentration and pH values suggesting that according to the concentration of the oxocarbon, the structural arrangements of the adsorbates on the silver surfaces change, due to a decrease of intermolecular π–π interactions between neighboring rings.

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Synthesis and characterization of cobalt(II) complexes of croconate and dicyanomethylene-substituted derivatives †

Cited by 49 publications

References 37 publications

Synthesis, crystal structure, spectroscopy, and magnetism of a mixed valence Co(III)–Co(II)–Co(III) complex stabilized by N-(2-hydroxybenzyl)salicylaldimine

Synthesis, crystal structure, spectroscopy, and magnetism of a mixed valence Co(III)–Co(II)–Co(III) complex stabilized by N-(2-hydroxybenzyl)salicylaldimine

Molecular properties of coordination compounds of the croconate ion with first-row sivalent transition metals: a quantum mechanical study

Chemical behavior of croconic acid coordinated to Co(II) adsorbed on silver surface

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