Synthesis, characterization, thermal and spectroscopic studies of solid glycolate of light trivalent lanthanides, except promethium

General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. Users may download and print one copy of any publication from the public portal for the purpose of private study or research.  You may not further distribute the material or use it for any profit-making activity or commercial gain  You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.

Section: Discussionmentioning

confidence: 99%

Thermal behavior and decomposition of cerium(III) butanoate, pentanoate and hexanoate salts upon heating in argon

Grivel

Guevara

Zhao

et al. 2017

“…Europium, gadolinium, terbium and dysprosium chloride solutions were prepared from the corresponding metal oxides (Sigma, 99,9%, analytical grade) by treatment with concentrated hydrochloric acid, following the procedure described in the literature [16]. The rare earth carbonates were prepared by adding slowly with continuous stirring saturated sodium hydrogen carbonate solution to the corresponding metal chloride previously prepared.…”

Section: Synthesismentioning

confidence: 99%

Synthesis, thermoanalytical, spectroscopic study and pyrolysis of solid rare earth complexes (Eu, Gd, Tb and Dy) with p-aminobenzoic acid

Teixeira

Nunes

Nascimento

et al. 2016

Self Cite

Synthesis, thermoanalytical, spectroscopic study and pyrolysis of some solid-state rare earth complexes with p-aminobenzoic acid (Eu, Gd, Tb and Dy) were performed. All the synthesized complexes were obtained as monohydrated state and the thermal decomposition in dynamic dry air atmosphere occurs in two, three or four steps with the formation of the respective oxides, Tb 4 O 7 and Ln 2 O 3 (Ln = Eu, Gd and Dy). In dynamic dry nitrogen atmosphere, the thermal decomposition occurs in three or four consecutive and/or overlapping steps and the mass loss are still being observed up to 1000 • C. The DSC curves in nitrogen atmosphere show that all complexes presented a reversible phase transition. EGA results permitted to identify the gaseous products released during pyrolysis and thermal oxidation of the complexes. The spectroscopic study provided information about vibrational and electronic transitions of the complexes. Middle and near infrared region provided information about the vibrational modes and the ligand's denticity in these complexes. Moreover, near infrared spectra together with ultraviolet and visible spectra (diffuse reflectance) provided information regarding the 4f-4f transitions of the rare earth ions. The arithmetic difference between the diffuse reflectance spectra in the solid state of the europium(III) and gadolinium(III) complexes reveals the presence of a ligand-to-metal (O 2− → Eu 3+) charge transfer (LMCT) in the 305-470 nm range.

“…The literature reports studies with picolinic N-oxide forming bivalent transition metals ions [12], trivalent lanthanide ions [13][14][15], rare earth picolinate complexes [16][17] and others lanthanide complexes [18]. Previous papers demonstrating the thermal behavior of lanthanides picolinates have been reported [14,17], however, no systematic study about the thermal behavior of the alkaline earth metal picolinates has been found.…”

Section: Introductionmentioning

confidence: 99%

Thermal analysis in oxidative and pyrolysis conditions of alkaline earth metals picolinates using the techniques: TG-DSC, DSC, MWTA, HSM and EGA (TG-DSC-FTIR and HSM-MS)

Nascimento

Parkes

Ashton

et al. 2018

Self Cite

Synthesis, characterization, thermal stability and pyrolysis of some alkaline earth picolinates M(C6H5NO2)2nH2O (where M = Mg(II), Ca(II), Sr(II) and Ba(II) and n = di (Mg), mono (Ca), hemi three (Sr) hydrated) were investigated using a range of techniques including simultaneous thermogravimetry and differential scanning calorimetry (TG-DSC), evolved gas analysis (EGA), differential scanning calorimetry (DSC), Hot-Stage microscopy (HSM), powder X-ray diffractometry (PXRD), complexometry with EDTA and elemental analysis (EA). The TG-DSC curves show that the hydrated compounds dehydrate in a single step of mass loss and the thermal stability of the anhydrous compound is little influenced from the atmosphere used. On the other hand, the mechanisms of thermal decomposition are profoundly influenced by the atmosphere used, as can also be observed in the EGA data. In addition, a comparison between two calorimetric techniques, Microwave Thermal Analysis (MWTA) and DSC, was made which showed similar profiles. Two evolved gas analysis (EGA) techniques: TG-DSC coupled to FTIR and HSM coupled to a quadrupole mass spectrometer (MS) were also used to provide additional information about the pyrolysis mechanism.