Thermal behaviour of fumaric acid, sodium fumarate and its compounds with light trivalent lanthanides in air atmosphere

Ionashiro, E. Y.; Caires, Flávio Júnior; Siqueira, A. B.; Lima, Liliane Spazzapam; Carvalho, Cláudio Teodoro de

doi:10.1007/s10973-011-1660-0

Cited by 36 publications

(18 citation statements)

References 12 publications

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“…7 (first emission at T max1?5°C ), the appearance of the absorption bands at 2,329 and 2,358 cm -1 which are attributed to CO 2 [25][26][27] may indicate on the partial decarboxylation process of initially formed products, e.g., acid anhydrides at higher temperatures.…”

Section: Tg/dsc/ftir Characterization Of Linear Geranyl Diestersmentioning

confidence: 99%

TG/DSC/FTIR characterization of linear geranyl diesters

Worzakowska

Ścigalski

2012

J Therm Anal Calorim

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The synthesis, thermal behavior, and characterization of the decomposition products of linear geranyl diesters: digeranyl succinate, digeranyl glutarate, digeranyl adipinate, and digeranyl sebacinate were presented. The linear geranyl diesters were prepared in direct esterification process of a molar stoichiometric ratio of geraniol and suitable acidic reagent in solvent-free medium at 130°C using butylstannoic acid as a catalyst. Their structure was confirmed based on FTIR, 1 H-and 13 C-NMR spectra. It was proved that the use of tin catalyst allowed decreasing the reaction time and increasing the final conversion of substrates when compared to non-catalyzed process. It considerably simplifies the processing by reduction of the preparation cost and thus this new method of synthesis of aroma diesters may be attractive for practical applications. The thermal behavior of prepared compounds was studied by TG/DSC/FTIR coupled method. TG analysis showed that diesters are thermally stable up to temperatures above 200°C. The DTG curves confirmed that these decomposition run as a single-stage process. The T max1 were in the range of 294.5-313.8°C depending on the aliphatic chain length (-CH 2 -) n in the structure of aroma diesters, which was in accordance with DSC data. The analysis of the gases evolved during heating of diesters in inert atmosphere indicated on the asymmetrical disrupt of their bonds. The cleavage of ester bond and O-geranyl bond was expected. It resulted in production of the mixture of derivatives of geraniol (acyclic and alicyclic monoterpene hydrocarbons) like myrcene, ocimene, or limonene as main decomposition products. In addition, the formation of anhydride, lactone, or ketone functionalities among the degradation products clearly confirmed the proposed degradation path of studied diesters.

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Section: Tg/dsc/ftir Characterization Of Linear Geranyl Diestersmentioning

confidence: 99%

TG/DSC/FTIR characterization of linear geranyl diesters

Worzakowska

Ścigalski

2012

J Therm Anal Calorim

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“…IR spectra of 1 show characteristic absorptions mainly attributed to the asymmetric (ν as : 1578 cm -1 ) and symmetric (ν s : ca. 1364 cm -1 ) stretching vibrations of the carboxylic groups which correspond to the Na 2 (fum) [60]; this also shows isomerization of maleic acid. Separation between the antisymmetic and symmetric carboxylate stretching in the IR spectrum is 214 cm -1 , which is a little large, and may be "pseudo-unidentate" coordination of fum ions because of the hydrogen bridges [61].…”

Section: X-ray Crystallographymentioning

confidence: 87%

Synthesis, crystal structure, thermal stability, and photoluminescence of a 3-D silver(I) network with twofold interpenetrated dia-f topology

Han

Wang

Guo

et al. 2015

Journal of Coordination Chemistry

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Sun (2015): Synthesis, crystal structure, thermal stability, and photoluminescence of a 3D silver(I) network with 2-fold interpenetrated dia-f topology, Journal of Coordination Chemistry, A silver(I) coordination polymer with mixed 3,3',5,5'-tetramethyl-4,4'-bipyrazole (bpz) and maleic acid, [Ag 2 (bpz) 3 (fum)] n (1, H 2 fum = fumaric acid), was synthesized under hydrothermal condition by in situ isomerization of maleic acid to fumaric acid and characterized by elemental analysis, IR spectroscopy, powder X-ray diffraction, TGA and single-crystal X-ray diffraction.The maleic acid in situ isomerizes to fumaric acid and participates in the formation of 1.Topologically, the structure of 1 features a rare 3-connected 2-fold interpenetrated dia-f net with a point symbol of {4.14 2 }. Compound 1 exhibits photoluminescence in the solid state with an emission maximum at 470 nm upon excitation at 365 nm at room temperature, which is attributed to intraligand or/and interligand π→π* transition.

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“…The FTIR spectra exhibited directly the bands characteristic for carbon dioxide at 2310-2360 cm -1 [20][21][22][23], carbon oxide at 2110-2184 cm -1 [22,23], and water vapor at 3600-3740 cm -1 [22][23][24][25][26]. The presence of the deformation vibrations and the stretching vibrations at 1373-1384, 1448-1458 ,and 2734-2969 cm -1 related to the C-H vibrations in the -CH 3 and -CH 2 -groups are observed.…”

Section: Decomposition In Inert Atmospherementioning

confidence: 99%

Thermal properties of citronellyl diesters

Worzakowska

2014

J Therm Anal Calorim

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Thermal properties of linear citronellyl diesters were studied by TG/DSC/FTIR/QMS-coupled method in inert and oxidative atmospheres. The diesters decompose in one main step in inert atmosphere. As main pyrolysis products, the formation of mainly monoterpene hydrocarbons, acid anhydrides, monoacids, cyclic ketones, aldehyde fragments, carbon dioxide, and water was observed. It was indicated on the ester and O-citronellyl bonds cleavage, partial decarboxylation, and elimination of water from formed dicarboxylic acids during their pyrolysis. The decomposition in air runs in two steps. The first step was connected with the creation of monoterpene hydrocarbons, monoacids, cyclic ketones, aldehydes, carbon dioxide, carbon monoxide, and water. In the second step of decomposition, mainly carbon dioxide and water were produced. It was testified to ester and O-citronellyl bonds cleavage, partial oxygenation, and decarboxylation process of the primary formed decomposition products.

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Thermal behaviour of fumaric acid, sodium fumarate and its compounds with light trivalent lanthanides in air atmosphere

Cited by 36 publications

References 12 publications

TG/DSC/FTIR characterization of linear geranyl diesters

TG/DSC/FTIR characterization of linear geranyl diesters

Synthesis, crystal structure, thermal stability, and photoluminescence of a 3-D silver(I) network with twofold interpenetrated dia-f topology

Thermal properties of citronellyl diesters

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