A nearly symmetric trinuclear chromium(III) oxo carboxylate assembly: preparation, molecular and crystal structure, and magnetic properties of [Cr3O(O2CPh)6(MeOH)3](NO3) · 2MeOH

Vlachos, Antonis; Psycharis, Vassilis; Raptopoulou, Catherine P.; Lalioti, Nikolia; Sanakis, Yiannis; Diamantopoulos, G.; Fardis, M.; Karayanni, M.; Papavassiliou, G.; Terzis, Aris

doi:10.1016/j.ica.2004.04.005

Cited by 47 publications

(40 citation statements)

References 38 publications

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“…4) and the peaks have been indexed by the crystal system (Table 5). The lattice parameters (d, 2h, height and area) indicated the pattern of the sample matched well with those of other trinuclear chromium(III) oxo-carboxylate assemblies reported earlier [11,26,27]. With the help of the data obtained from the powder XRD, the particle size of the complexes has been calculated using the standard equation given by Scherrer [30].…”

Section: Thermal Studiessupporting

confidence: 75%

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Synthesis, spectral and thermal characterization of nano-sized, oxo-centered, trinuclear carboxylate-bridged chromium(III) complexes of hydroxycarboxylic acids

Baranwal

Fatma

Varma

2009

Journal of Molecular Structure

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Section: Thermal Studiessupporting

confidence: 75%

“…The magnetic moment of oxo-centered trinuclear chromium carboxylate complexes have been explained in detail by earlier workers [26,27]. The magnetic moment of these complexes were found in the range 3.37 ± 0.03 B.M.…”

Section: Electronic Spectra and Magnetic Momentsmentioning

confidence: 73%

Synthesis, spectral and thermal characterization of nano-sized, oxo-centered, trinuclear carboxylate-bridged chromium(III) complexes of hydroxycarboxylic acids

Baranwal

Fatma

Varma

2009

Journal of Molecular Structure

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“…[25] In some cases analysis of the X-band EPR spectra suggests that, apart from the role of antisymmetric exchange, the role of distributions of the Heisenberg and non-Heisenberg exchange coupling parameters is also of special importance. [25][26][27] Such distributions have also been implied from Mössbauer studies in the case of Fe III complexes. [13,25,28] Inelastic neutron scattering studies with the spectral characteristics at low temperature have been explained assuming that more than one triangular complex with different degrees of symmetry-lowering are present in the structure.…”

Section: Introductionmentioning

confidence: 59%

Syntheses, Structural, and Physical Studies of Basic Cr^III and Fe^III Benzilates and Benzoates: Evidence of Antisymmetric Exchange and Distributions of Isotropic and Antisymmetric Exchange Parameters

et al. 2006

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The synthesis, crystal structures, spectroscopic and magnetic properties studies of four trinuclear oxo‐centered carboxylate complexes are reported and discussed: [Cr3(μ3‐O){O2C(OH)Ph2}6(H2O)3](NO3)·2H2O·3Me2CO (1·2H2O·3Me2CO), [Cr3(μ3‐O)(O2CPh)6(H2O)3](NO3)·1.9MeCN·0.5H2O (2·1.9MeCN·0.5H2O), [Fe3(μ3‐O){O2C(OH)Ph2}6(H2O)3](NO3)·5.69H2O (3·5.69H2O), and [Fe3(μ3‐O)(O2CPh)6(H2O)3](NO3)·3MeCN (4·3MeCN). From a crystallographic point of view, the three metal ions form an isosceles triangle in 1 and 3 (benzilato complexes) and an almost equilateral one in 2 and 4 (benzoato complexes). Magnetic susceptibility measurements reveal metal‐dependent isotropic exchange, for the CrIII clusters (1, 2), with the “magnetic symmetry” resembling that of an almost equilateral triangle. For the FeIII clusters the “magnetic symmetry” resembles that of an isosceles triangle. Solid‐state 1H NMR studies for 1, through the measurements of the temperature variation of the relaxation rate 1/T1, reveal that the first excited spin state with ST = 3/2 is well above (ca. 30 cm–1) the ground state with ST = 1/2, consistent with the magnetic susceptibility data. Mössbauer spectroscopic studies give a larger quadrupole splitting, ΔEQ, value for 3 than for 4, because of a larger charge asymmetry in 3 attributed to the different nature of the carboxylato ligands. EPR experiments at X‐band reveal the presence of antisymmetric exchange within the CrIII clusters and distributions of both isotropic and antisymmetric exchange interactions. In the case of 2 the magnitude and distribution of these interactions are greater. EPR spectroscopy for 3 suggests weak interactions between neighboring units, which could be described assuming a dimer of trimers. For complex 4 the EPR spectra indicate a more complicated picture. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)

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“…They are known with a wide variety of metal ions (M), bridging carboxylate anions (RCO 2 -), and monodentate terminal ligands (L) as well as with mixed-valence and mixed-metal combinations [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of two novel trinuclear oxo-centered, of chromium and iron complexes containing unsaturated carboxylate bridging ligand

Yazdanbakhsh¹,

Lotfian²,

Tavakkoli³

2009

Bull. Chem. Soc. Eth.

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ABSTRACT.ABSTRACT. ABSTRACT. ABSTRACT. Two novel oxo-centered trinuclear compounds, [M2M′O(C3H3O2)6(H2O)3] + (M = Cr, M′ = Cr, Fe) have been synthesized. The complexes were characterized by elemental analysis, infrared and electronic spectroscopy and thermogravimetric analysis (TGA). These complexes contain unsaturated carboxylate bridging ligands that cause them to have potential scopes for polymerization in the solid state by cross-linking of substituents. Bridging coordination modes for carboxylates were indicated by presence of νasym (M2M'O) vibrations in the infrared spectra.

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A nearly symmetric trinuclear chromium(III) oxo carboxylate assembly: preparation, molecular and crystal structure, and magnetic properties of [Cr3O(O2CPh)6(MeOH)3](NO3) · 2MeOH

Cited by 47 publications

References 38 publications

Synthesis, spectral and thermal characterization of nano-sized, oxo-centered, trinuclear carboxylate-bridged chromium(III) complexes of hydroxycarboxylic acids

Synthesis, spectral and thermal characterization of nano-sized, oxo-centered, trinuclear carboxylate-bridged chromium(III) complexes of hydroxycarboxylic acids

Syntheses, Structural, and Physical Studies of Basic Cr^III and Fe^III Benzilates and Benzoates: Evidence of Antisymmetric Exchange and Distributions of Isotropic and Antisymmetric Exchange Parameters

Synthesis and characterization of two novel trinuclear oxo-centered, of chromium and iron complexes containing unsaturated carboxylate bridging ligand

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A nearly symmetric trinuclear chromium(III) oxo carboxylate assembly: preparation, molecular and crystal structure, and magnetic properties of [Cr3O(O2CPh)6(MeOH)3](NO3) · 2MeOH

Cited by 47 publications

References 38 publications

Synthesis, spectral and thermal characterization of nano-sized, oxo-centered, trinuclear carboxylate-bridged chromium(III) complexes of hydroxycarboxylic acids

Synthesis, spectral and thermal characterization of nano-sized, oxo-centered, trinuclear carboxylate-bridged chromium(III) complexes of hydroxycarboxylic acids

Syntheses, Structural, and Physical Studies of Basic CrIII and FeIII Benzilates and Benzoates: Evidence of Antisymmetric Exchange and Distributions of Isotropic and Antisymmetric Exchange Parameters

Synthesis and characterization of two novel trinuclear oxo-centered, of chromium and iron complexes containing unsaturated carboxylate bridging ligand

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Syntheses, Structural, and Physical Studies of Basic Cr^III and Fe^III Benzilates and Benzoates: Evidence of Antisymmetric Exchange and Distributions of Isotropic and Antisymmetric Exchange Parameters