Volatility studies of metal chelates. V. Stability and volatility of transition metal chelates of tetradentate Schiff bases

1981 ◽  
Vol 34 (8) ◽  
pp. 1579 ◽  
Author(s):  
S Dilli ◽  
E Patsalides
Keyword(s):  
Thermal Stability ◽  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Metal Ion ◽  
Metal Chelates ◽  
Acid Base ◽  
Substituent Group ◽  
Transition Metal Chelates ◽  
Distinctive Role

A study of the effect of substituent groups on the thermal stability and volatility of 15 tetradentate β-keto enamines and various copper(II), nickel(II), palladium(II), cobalt(II), and oxovanadium(IV) derivatives has been made by employing simultaneous thermogravimetry and differential thermal analysis. The majority of these chelates are stable at temperatures above 300°C although volatilities are significantly lower than for the corresponding β-diketonates. Trends in the volatilities of the copper(II), nickel(II), palladium(II) and oxovanadium(IV) chelates are rationalized in terms of substituent-group effects on the polarity and intermolecular Lewis acid-base interactions. The distinctive role of the metal ion in controlling chelate volatility is also discussed.

Volatility Studies of Metal Chelates. IV*Thermal Behaviour of Copper(II) Chelates of Aryl β-Diketones

1979 ◽  
Vol 32 (2) ◽  
pp. 277 ◽  
Author(s):  
S Dilli ◽  
K Robards
Keyword(s):  
Thermal Stability ◽  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Aromatic Ring ◽  
Thermal Behaviour ◽  
Metal Chelates ◽  
Fluorine Substitution

The thermal stability and volatility of the copper (II) chelates of 38 aryl β-diketones have been examined by combined thermogravimetry and differential thermal analysis. Volatility is characterized by fluorine substitution (in R and R' of RCOCH2COR?), particularly in the alkyl (R) moiety of the β-diketone. When chlorine, bromine and methyl substituents are introduced into the aromatic ring (R'), there is a significant reduction in volatility. If R is CH3, thermal stability is markedly affected, especially when R' is C6F5.

scholarly journals Biologically Active Transition Metal Chelates of Ni(II), Cu(II) and Zn(II) With 2-Aminothiazole-Derived Schiff-bases: Their Synthesis, Characterization and the Role of Anions (NO3 , SO42− , C2O42- and CH3CO2− ) on Their Antibacterial Properties

1999 ◽  
Vol 6 (3) ◽  
pp. 187-192 ◽  
Author(s):  
Zahid H. Chohan
Keyword(s):  
Schiff Bases ◽  
Metal Ion ◽  
Bacterial Species ◽  
Analytical Data ◽  
Antibacterial Properties ◽  
Metal Chelates ◽  
Biologically Active ◽  
Transition Metal Chelates ◽  
Active Transition

Biologically active nickel(ll), copper(ll) and zinc(ll) chelates with thiazole-derived nitro- and chlorosalicylaldehyde Schiff-bases having the same metal ion but different anions, e.g. nitrate, sulfate, oxalate and acetate have been synthesized and characterized on the basis of their physical, spectral and analytical data. In order to evaluate the possible participating role of anions on the antibacterial properties, these ligands and their synthesized metal chelates with various anions have been screened against bacterial species Escherichia coli, Pseudomonas aeruginosa and Staphylococcus aureus.

Study of thermal stability of n-type skutterudites Sr0.07Ba0.07Yb0.07Co4Sb12 by differential thermal analysis and Knudsen effusion method

Calphad ◽  
2021 ◽  
Vol 73 ◽  
pp. 102258
Author(s):  
František Zelenka ◽  
Jakub Strádal ◽  
Pavel Brož ◽  
Jan Vřešťál ◽  
Jiří Buršík ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Knudsen Effusion ◽  
Knudsen Effusion Method ◽  
Effusion Method ◽  
Thermal Stability Of

scholarly journals Thermal and structural characterization of the vitreous samples in the SiO2 - PbO - Na2O system

2006 ◽  
pp. 89-95 ◽  
Author(s):  
Catalina Mocioiu ◽  
Georgeta Jitianu ◽  
Maria Zaharescu
Keyword(s):  
Thermal Stability ◽  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Infrared Spectroscopy ◽  
Silicate Glasses ◽  
Lead Silicate ◽  
High Chemical ◽  
Nuclear Techniques ◽  
Infrared Data

Lead-containing glasses have been used from the ancient time. Recently, due to the possible application in optics, electronics, nuclear techniques, wastes inactivation. the interest in these types of glasses has been renewed. For lead waste inactivation, glasses with high amount of PbO in the composition are required, those exhibiting at the same time a high chemical and thermal stability. Thermal behavior of lead-silicate glasses was examined by differential thermal analysis (DTA). Infrared spectroscopy was used to investigate the structure of the glasses. The spectra were interpreted in terms of the structures of silicate group by comparison with the spectra of other silicate crystals. The DTA and infrared data were correlated with the chemical stability tests.

scholarly journals Thermal stability and thermal decomposition of sucralose

2018 ◽  
Vol 39 (4) ◽  
pp. 21
Author(s):  
Gilbert Bannach ◽  
Rafael R. Almeida ◽  
Luis G. Lacerda ◽  
Egon Schnitzler ◽  
Massao Ionashiro
Keyword(s):  
Thermal Stability ◽  
Thermal Analysis ◽  
Differential Scanning Calorimetry ◽  
Thermal Decomposition ◽  
Differential Thermal Analysis ◽  
Infrared Spectroscopy ◽  
Scanning Calorimetry ◽  
Thermoanalytical Techniques ◽  
Thermal Stability Of

Several papers have been described on the thermal stability of the sweetener, C12H19Cl3O8 (Sucralose). Nevertheless no study using thermoanalytical techniques was found in the literature. Simultaneous thermogravimetry and differential thermal analysis (TG-DTA), differential scanning calorimetry (DSC) and infrared spectroscopy, have been used to study the thermal stability and thermal decomposition of sweetener.

Dielectric-differential thermal analysis IV the role of water

1987 ◽  
Vol 32 (4) ◽  
pp. 1271-1276 ◽  
Author(s):  
M. Carreras ◽  
R. Roque-Malherbe ◽  
C. de las Pozas
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis

Thermal Stability vs. Crystallization of the Lithiumsilicate Glasses with Addition Zirconium Dioxide and Titanium Dioxide

2008 ◽  
Vol 39-40 ◽  
pp. 399-401
Author(s):  
Viliam Pavlík ◽  
Eugen Jóna ◽  
Martina Sapietová ◽  
Soňa Šnircová
Keyword(s):  
Activation Energy ◽  
Thermal Stability ◽  
Thermal Analysis ◽  
Titanium Dioxide ◽  
Differential Thermal Analysis ◽  
Structural Analysis ◽  
Zirconium Dioxide ◽  
X Ray Diffraction ◽  
X Ray ◽  
The Relationship

The glasses with composition of Li2O . 2 SiO2 . n ZrO2 . n TiO2 (where n = 0; 0.015; 0.031; 0.050; 0.075; 0.1; 0.15; 0.2) were prepared and the relationship between structural and selected parameters of thermal stability vs. crystallization has been studied by differential thermal analysis. Structural analysis was provided by X–ray diffraction. The order of thermal stability vs. crystallization representing of activation energy of studied glass systems which increase with higher addition both oxides. The same order was obtained from the values of XRD. On the comparison the glasses with zero addition titanium dioxide their activation energy was much higher.

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