14024-18-1Relevant articles and documents
RATE OF LIGAND EXCHANGE OF TRIS(ACETYLACETONATO)IRON(III) WITH TRIFLUOROACETYLACETONE AND TRIS(TRIFLUOROACETYLACETONATO)IRON(III) WITH ACETYLACETONE
Sekine, Tatsuya,Inaba, Kazuho
, p. 1669 - 1672 (1983)
The rate of ligand exchange of tris(acetylacetonato)iron(III) with trifluoroacetylacetone and tris(trifluoroacetylacetonato)iron(III) with acetylacetone in carbon tetrachloride has been measured spectrophotometrically and the reaction mechanism was discus
ELECTRON PARAMAGNETIC RESONANCE OF FERRIC ACETYL ACETONATE.
Hedewy,Hoffmann
, p. 129 - 133 (1986)
X and Q band EPR spectra for Fe(acac)//3 in the temperature range from 100 to 443 K indicate coexistence of two types of Fe(III) high spin complexes. A temperature dependence study of EPR spectra exhibits a phase transition temperature at 353 K.
The direct electrochemical synthesis of transition metal acetylacetonates
Long,Lagowski
, p. 813 - 815 (2007)
Acetylacetonates were prepared electrochemically in good yield using the pure liquid ligand, acetylacetone, as the solvent, in which the supporting electrolyte, tetra-n-butyammonium hexafluorophosphate, was dissolved; the metal of interest served as the electrodes. The products were characterized by UV-visible spectrometry (color) and mass spectrometry. Both a lower, M(AcAc)2, and a higher, M(AcAc)3, oxidate state were formed for the cobalt and manganese systems; the identity of the product(s) could be biased by a careful choice of the potential used for the synthesis.
A Novel [Fe(acac)3] Interspersed g-C3N4 Heterostructure for Environmentally Benign Visible-Light-Driven Oxidation of Alcohols
Devi, Meghali,Ganguly, Sreejeeb,Bhuyan, Bishal,Dhar, Siddhartha Sankar,Vadivel, Sethumathavan
, p. 4819 - 4825 (2018)
The present work describes facile synthesis of a novel Fe(acac)3 decorated g-C3N4 heterostructure. Mixing of iron(III) complex with g-C3N4 thorough simple ultrasonication leads to the formation of the heterostructure. The material was thoroughly characterized by FT-IR, powder XRD, SEM, TEM, UV/Vis DRS and XPS analysis. The analytical results clearly indicate that the FeIII complex is uniformly interspersed with g-C3N4. The results also suggest that there exists synergy between two components in the heterostructure for enhance catalytic performance. This novel material was used as heterogeneous catalyst for visible light driven oxidation of a number of alcohols by H2O2. The best ratio of the Fe(acac)3 and g-C3N4 is determined with PL analysis. Cold LED light was used as source of visible light. Metal complex decorated g-C3N4 heterostructured materials have been rarely used as catalysts for synthetically useful organic transformations. Thus present work on the use of this materials promises to open up new avenues in future growth in metal complex-graphitic nitride based heterostructure nanocatalysis.
Achirality in the low temperature structure and lattice modes of tris(acetylacetonate)iron(III)
Ellis, Thomas K.,Kearley, Gordon J.,Piltz, Ross O.,Jayasooriya, Upali A.,Stride, John A.
, p. 8278 - 8283 (2016)
Tris(acetylacteonate) iron(iii) is a relatively ubiquitous mononuclear inorganic coordination complex. The bidentate nature of the three acetylacteonate ligands coordinating around a single centre inevitably leads to structural isomeric forms, however whether or not this relates to chirality in the solid state has been questioned in the literature. Variable temperature neutron diffraction data down to T = 3 K, highlights the dynamic nature of the ligand environment, including the motions of the hydrogen atoms. The Fourier transform of the molecular dynamics simulation based on the experimentally determined structure was shown to closely reproduce the low temperature vibrational density of states obtained using inelastic neutron scattering.
Investigation of nanocrystalline phases in Li-La-Fe-O system formed by the decomposition of acetylacetonato complexes
Vu?ini?-Vasi?,Antic,Kremenovi?,Nikolic,Blanusa,Raki?,Spasojevic,Kapor
, p. 322 - 326 (2007)
Applying a new synthesis route based on the thermal decomposition of a mixture acetylacetonato complexes, Li(AA), La(AA)3 and Fe(AA)3, Li, La ferrite (Li0.5La0.08Fe2.42O4) was formed. The element analysis performed by ICP technique and the Rietveld refinement data indicate that the sample is composed of three phases: Li0.5La0.08Fe2.42O4 (69%, SG P4332, a = 8.3445(3) ?), La0.14Fe3O4 (16%, SG F d over(3, ?) m, a = 8.403(1) ?) and LiFeO2 (15%, SG F m over(3, ?) m, a = 4.2291(8) ?). A partial substitution Fe3+ → La3+ in Li ferrite and La insertion at 16c site in Fe3O4 occur at low concentrations. A partial cation ordering at 4b and 12d octahedral sites in Li0.5La0.08Fe2.42O4 was noticed. TEM micrograph shows that the nanoparticles are spherically shaped and that the particle distribution is in the range between 7 and 33 nm. The sample exhibits superparamagnetic behavior, thus the composite has potential industrial applications.
Isomerism, molecular structure, and vibrational assignment of tris(triflouroacetylacetonato)iron(III): An experimental and theoretical study
Gandomi, Farzad,Takjoo, Reza,Tayyari, Sayyed Faramarz,Vakili, Mohammad
, (2022)
The isomerism, optimized molecular structure, UV spectrum, metal-ligand bond strength, and vibrational assignment of tris(triflouroacetylacetonato)iron(III), Fe(TFAA)3, were investigated by the aid of theoretical calculations (using DFT and Atoms-in-Molecules (AIM) at the B3LYP/6-311++G(d,p) level) and experimental methods (vibrational and UV spectroscopy). To explore the effect of the CF3 substituent in the β-position on the properties of complex, the above theoretical and experimental results of the titled complex compared with the corresponding data for tris(acetylacetonato) iron(III), Fe(AA)3. Both theoretical and experimental results confirmed that there is no significant difference in the strength of the Fe?O bond in these complexes. The effect of the CF3 group on the experimental vibrational bands of the chelated ring agrees with the calculated results. Comparing the observed and calculated vibrational spectra suggests that vibrational spectroscopy cannot be used to determine the type of isomer in the sample. However, due to the small difference of energy between the fac and mer isomers in the Fe(TFAA)3, the presence of both isomers in the sample is possible. The computed quantum chemical descriptors of Fe(TFAA)3 and Fe(AA)3 were also compared.
Effect of technique of applying layers of metal acetylacetonates on acid-base and chromatographic properties of sorbents
Slizhov, Yu. G.,Matveeva,Minakova
, p. 1376 - 1382 (2013)
A series of chromatographic sorbents, which differ by way of applying modifying chelates of acetylacetone was obtained. The acid-base and chromatographic properties of sorbents with thermally and chemically grafted layers of metal acetylacetonates were investigated. It was shown that the modifi cation of the mineral sorbents with metal acetylacetonates leads to a change in the surface acidity, as well as to an increase in the polarity and selectivity with respect to different classes of compounds.
Preparation and characterisation of crystalline tris(acetylacetonato)Fe(III) films grown on p-Si substrate for dielectric applications
Dakhel,Ali-Mohamed
, p. 162 - 167 (2007)
Thin tris(acetylacetonato)iron(III) films were prepared by sublimation in vacuum on glass and p-Si substrates. Then comprehensive studies of X-ray fluorescence (XRF), X-ray diffraction (XRD), optical absorption spectroscopy, AC-conductivity, and dielectric permittivity as a function of frequency and temperature have been performed. The prepared films show a polycrystalline of orthorhombic structure. The optical absorption spectrum of the film was identical with that of the bulk powder layer. For electrical measurements of the complex as insulator, sample in form of metal-insulator-semiconductor (MIS) structure was prepared and characterised by the measurement of the capacitance and AC-conductance as a function of gate voltage. From those measurements, the state density Dit at insulator/semiconductor interface and the density of the fixed charges in the complex film were determined. It was found that Dit was of order 1010 eV-1/cm2 and the surface charge density in the insulator film was of order 1010 cm-2. The frequency dependence of the electrical conductivity and dielectric properties of MIS structures were studied at room temperature. It was observed that the experimental data follow the correlated barrier-hopping (CBH) model, from which the fundamental absorption edge, the cut off hopping distance, and other parameters of the model were determined. It was found that the capacitance of the complex increases as temperature increases. Generally, the present study shows that the tris(acetylacetonato)iron(III) films grown on p-Si is a promising candidate for low-k dielectric applications, it displays low-k value around 2.0.
Immobilisation of iron tris(β-diketonates) on a two-dimensional flat amine functionalised silicon wafer: A catalytic study of the formation of urethane, from ethanol and a diisocyanate derivative
Conradie,Conradie,Erasmus
, p. 52 - 59 (2014)
A series of immobilised iron tris(β-diketonato) catalysts on a Si-wafer was prepared, by covalently anchoring the Fe(β-diketonato) 3 complexes [where β-diketonato = (RCOCHCOR′)-, with 1 = acac (R = CH3; R′ = CH3), 2 = dbm (R = C6H5; R′ = C6H5), 3 = tfaa (R = CH3; R′ = CF3), and 4 = hfaa (R = CF3; R′ = CF3)], onto an aminated functionalised Si-wafer. These new catalysts were characterised by X-ray photo-electron spectroscopy (XPS) and atomic force microscopy (AFM). XPS data revealed that ca. 27-91% of all the amine groups anchored the catalyst, Fe(β-diketonato)3. Different Gaussian peaks could be fitted into the F 1s peak, due to the fluorine either being positioned adjacent to the -C-O-Fe-, or to the -C-N-Fe-. The binding energy of the Fe 2p3/2 peak varied between ca. 710.4 and 711.0 eV, depending on the electron donating properties of the R-groups on the β-diketonato ligands, expressed as the sum of the Gordy group electronegativities of the R-groups in the β-diketonato ligands. The AFM photographs showed that the surface changed dramatically after each treatment: after amination (binding of the aminate silane onto the hydroxylate Si-wafer) the Si-wafer turned from flat with a few spikes, to a very wavy surface with smooth lumps. The surface topography again changed, after covalent anchoring of the iron tris(β-diketonato) complexes, to a nodular surface with poorly defined grain boundaries. These immobilised iron tris(β-diketonato) on Si-wafer catalysts, were evaluated for their catalytic activity, during the formation of hexamethylenediurethane from hexamethylenediisocyanate and ethanol. The TOF varied between 15 and 46 s-1, depending on the electron donating properties of the R-groups on the β-diketonato ligands. The more electron donating the R groups, the higher the TOF.
