The solid state isomerization and thermal decomposition of pentamminethiocyanatocobalt(III) salts [Co(NH3)5SCN] X2 (X = Cl, SCN)

1974 ◽  
Vol 27 (7) ◽  
pp. 1391 ◽  
Author(s):  
MR Snow ◽  
RJ Thomas
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermal Decomposition ◽  
Solid State ◽  
Thermogravimetric Analysis ◽  
Water Solution ◽  
Scanning Calorimetry ◽  
Thiocyanate Complex ◽  
Lower Temperature ◽  
Intramolecular Process ◽  
Tracer Experiments

Radiochemical tracer experiments show that in the thiocyanate complex, [Co(NH3)5SCN] [SCN]2, thermal isomerization to the isothiocyanate salt proceeds with incorporation of anionic thiocyanate. At least 45% of the isomerization process proceeds by a dissociative path. This contrasts with the mechanism in water solution where isomerization occurs without exchange with thiocyanate in solution. The result also shows the inadequacy of the generally made assumption that isomerization in the solid state is an intramolecular process. The chloride and thiocyanate salt were subjected to simultaneous thermogravimetric analysis and differential scanning calorimetry. The thiocyanate salt deamminates at a much lower temperature (from 100�C) than the chloride (from 160�C), but no process corresponding to the isomerization could be detected.

scholarly journals Preparation and thermal decomposition of solid state cinnamates of alkali earth metals, except beryllium and radium

1998 ◽  
Vol 23 (0) ◽  
pp. 91-98 ◽  
Author(s):  
Ana Glauce ZAINA CHIARETTO ◽  
Marco Aurélio da Silva CARVALHO FILHO ◽  
Nedja Suely FERNANDES ◽  
Massao IONASHIRO
Keyword(s):  
Thermal Stability ◽  
Differential Scanning Calorimetry ◽  
Thermal Decomposition ◽  
Solid State ◽  
General Formula ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Preparation And Thermal Decomposition ◽  
Derivative Thermogravimetry

Solid state compounds of general formula ML2.nH2O [where M is Mg, Ca, Sr or Ba; L is cinnamate (C6H5 -CH=CH-COO-) and n = 2, 4, 0.8, 3 respectively], have been synthetized. Thermogravimetry (TG), derivative thermogravimetry (DTG), differential scanning calorimetry (DSC) and X-ray diffraction powder patterns have been used to characterize and to study the thermal stability and thermal decomposition of these compounds.

scholarly journals Synthesis, characterization and thermal behaviour on solid pyruvates of light trivalent lanthanides

2007 ◽  
Vol 32 (4) ◽  
pp. 49-54 ◽  
Author(s):  
A. B. Siqueira ◽  
C. T. de Carvalho ◽  
E. C. Rodrigues ◽  
E. Y. Ionashiro ◽  
G. Bannach ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermal Decomposition ◽  
Infrared Spectroscopy ◽  
Solid State ◽  
Thermal Behaviour ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Trivalent Lanthanides ◽  
Light Trivalent Lanthanides ◽  
Derivative Thermogravimetry

Solid State Ln-L compounds, where Ln stands for light trivalent lanthanides (La - Gd) and L is pyruvate, have been synthesized. Thermogravimetry and derivative thermogravimetry (TG/DTG), differential scanning calorimetry (DSC), X-Ray powder diffractometry, infrared spectroscopy, elemental analysis, and complexometry were used to characterize and to study the thermal behaviour of these compounds. The results led to information about the composition, dehydration, ligand denticity, thermal behaviour and thermal decomposition of the isolated compounds.

scholarly journals Synthesis, characterization and thermal behaviour on solid pyruvates of some bivalent metal ions.

2018 ◽  
Vol 34 (2) ◽  
pp. 15
Author(s):  
Adriano Buzutti De Siqueira ◽  
Cláudio Teodoro De Carvalho ◽  
Elias Yuki Ionashiro ◽  
Massao Ionashiro
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermal Decomposition ◽  
Infrared Spectroscopy ◽  
Solid State ◽  
Thermal Behaviour ◽  
Scanning Calorimetry ◽  
Bivalent Metal ◽  
X Ray ◽  
Bivalent Metal Ions ◽  
Derivative Thermogravimetry

Solid state M-L compounds, were M stands for bivalent Mn, Fe, Co, Ni, Cu, Zn and L is pyruvate, have been synthesized. Thermogravimetry and derivative thermogravimetry (TG/DTG), differential scanning calorimetry (DSC), X-Ray powder diffractometry, infrared spectroscopy, elemental analysis, and complexometry were used to characterize and to study the thermal behaviour of these compounds. The results led to information about the composition, dehydration, ligand denticity, and thermal decomposition of the isolated compounds.

scholarly journals Synthesis, characterization and thermal behaviour of solid-state compounds of 4-methoxybenzoate with lanthanum (III) and trivalent lighter lanthanides

2006 ◽  
Vol 31 (1) ◽  
pp. 21-30 ◽  
Author(s):  
E. C. Rodrigues ◽  
A. B. Siqueira ◽  
E. Y. Ionashiro ◽  
G. Bannach ◽  
M. Ionashiro
Keyword(s):  
Thermal Analysis ◽  
Differential Scanning Calorimetry ◽  
Thermal Decomposition ◽  
Differential Thermal Analysis ◽  
Solid State ◽  
Thermal Behaviour ◽  
Polymorphic Transformation ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Lighter Lanthanides

Solid-state M-4-MeO-Bz compounds, where M stands for trivalent La, Ce, Pr, Nd and Sm and 4-MeO-Bz is 4-methoxybenzoate, have been synthesized. Simultaneous thermogravimetry and differential thermal analysis (TG-DTA), differential scanning calorimetry (DSC), X-ray powder diffractometry, infrared spectroscopy and complexometry were used to characterize and to study the thermal behaviour of these compounds. The results led to information about the composition, dehydration, polymorphic transformation, ligand's denticity, thermal behaviour and thermal decomposition of the isolated compounds.

scholarly journals Thermal behavior studies of solid state compounds of 4-dimethylaminocinnamylidenepyruvate with alkali earth metals, except beryllium and radium

2000 ◽  
Vol 25 (0) ◽  
pp. 31-39 ◽  
Author(s):  
Egon SCHNITZLER ◽  
Wilson COSTA ◽  
Cristo Bladimiros MELIOS ◽  
Maria Ines Gonçalves LELES ◽  
Massao IONASHIRO
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermal Decomposition ◽  
Solid State ◽  
Thermal Behavior ◽  
General Formula ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Alkali Earth ◽  
Derivative Thermogravimetry

Solid state compounds of general formula M(DMCP)2.nH2O, where M represents Mg, Ca, Sr, Ba, and DMCP is 4-dimethylaminocinnamylidenepyruvate, and n = 1, except for Ca, where n = 2.5, have been prepared. Thermogravimetry, derivative thermogravimetry (TG, DTG), differential scanning calorimetry (DSC), X-ray diffraction powder patterns and complexometry were used to characterize and to study the thermal decomposition of these compounds.

scholarly journals Synthesis, characterization and thermal studies on solid state 3-methoxybenzoate of lighter trivalent lanthanides

2007 ◽  
Vol 32 (2) ◽  
pp. 17-21 ◽  
Author(s):  
P. R. Dametto ◽  
A. B. Siqueira ◽  
C. T. Carvalho ◽  
M. Ionashiro
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermal Decomposition ◽  
Infrared Spectroscopy ◽  
Solid State ◽  
Thermal Behaviour ◽  
Polymorphic Transformation ◽  
Thermal Studies ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Trivalent Lanthanides

Solid-state Ln -3-MeO-Bz compounds, where Ln stands for lighter trivalent lanthanides (La Sm) and 3-methoxybenzoate, have been synthesized. Thermogravimetry (TG), differential scanning calorimetry (DSC), X-ray powder diffractometry, infrared spectroscopy, and complexometry were used to characterize and to study the thermal behaviour of these compounds. The results led to information concerning the composition, dehydration, polymorphic transformation, thermal behaviour and thermal decomposition of the synthesized compounds.

scholarly journals Using the Coats-Redfern Method during Thermogravimetric Analysis and Differential Scanning Calorimetry Analysis of the Thermal Stability of Epoxy and Epoxy/Silica Nanoparticle Nanocomposites

2020 ◽  
Vol 55 (4) ◽  
Author(s):  
Subhi A. Al-Bayaty ◽  
Raheem A.H. Al-Uqaily ◽  
Najwa J. Jubier
Keyword(s):  
Activation Energy ◽  
Differential Scanning Calorimetry ◽  
Thermal Decomposition ◽  
Thermogravimetric Analysis ◽  
Heating Rate ◽  
Silica Nanoparticle ◽  
Frequency Factor ◽  
Inert Atmosphere ◽  
Diffusion Control ◽  
Scanning Calorimetry

In this paper, we provide a study of the thermal decomposition behavior of epoxy and epoxy/silica nanoparticle nanocomposites by using thermogravimetric analysis and differential scanning calorimetry techniques at temperatures ranging from 25°C to 600°C, using a constant heating rate of 10°C per minute under inert atmosphere. With increasing silica nanoparticle percentages of 2%, 4%, 6% and 8%, the kinetic parameters of the activation energy, frequency factor, and thermodynamics property were determined at conversion ranges between 20% to 80% using the Coats-Redfern method for diffusion control reaction (Janders) model. The Arrhenius equation for epoxy decomposition at a heating rate of 10°Cper minute equaled 5.7278x e185.984/RT. Thermal decomposition occurred through two stages: (1) with volatile removal and (2) with a random chain break. The effects of variation of silica nanoparticle percentages on glass transition temperature was investigated. The activation energy, frequency factor, rate constant, and other thermodynamic properties increased with additional silica nanoparticle content due to more bonding, as it needed more heat to break.

scholarly journals Synthesis, characterization and thermal behaviour on solid pyruvates of some bivalent metal ions

2009 ◽  
Vol 34 (2) ◽  
pp. 15-21
Author(s):  
A. B. Siqueira ◽  
C. T. de Carvalho ◽  
E. Y. Ionashiro ◽  
M. Ionashiro
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermal Decomposition ◽  
Infrared Spectroscopy ◽  
Solid State ◽  
Thermal Behaviour ◽  
Scanning Calorimetry ◽  
Bivalent Metal ◽  
X Ray ◽  
Bivalent Metal Ions ◽  
Derivative Thermogravimetry

Solid state M-L compounds, were M stands for bivalent Mn, Fe, Co, Ni, Cu, Zn and L is pyruvate, have been synthesized. Thermogravimetry and derivative thermogravimetry (TG/DTG), differential scanning calorimetry (DSC), X-Ray powder diffractometry, infrared spectroscopy, elemental analysis, and complexometry were used to characterize and to study the thermal behaviour of these compounds. The results led to information about the composition, dehydration, ligand denticity, and thermal decomposition of the isolated compounds.

Thermal Stability of N-Heterocycle-Stabilized Iodanes – A Systematic Investigation

2019 ◽  
Author(s):  
Andreas Boelke ◽  
Yulia A. Vlasenko ◽  
Mekhman S. Yusubov ◽  
Boris Nachtsheim ◽  
Pavel Postnikov
Keyword(s):  
Thermal Stability ◽  
Differential Scanning Calorimetry ◽  
Thermogravimetric Analysis ◽  
Systematic Investigation ◽  
Scanning Calorimetry ◽  
Thermal Stability Of

<p>The thermal stability of pseudocyclic and cyclic <i>N</i>-heterocycle-stabilized (hydroxy)aryl- and mesityl(aryl)-l<sup>3</sup>-iodanes (NHIs) through thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) is investigated. NHIs bearing <i>N</i>-heterocycles with a high N/C-ratio such as triazoles show among the lowest descomposition temperatures and the highest decomposition energies. A comparison of NHIs with known (pseudo)cyclic benziodoxolones is made and we further correlated their thermal stability with reactivity in a model oxygenation. </p>

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