Factors influencing the thermal stability of azo and bisazo compounds

Kazem‐Rostami, Masoud

doi:10.1007/s10973-019-08884-4

Cited by 18 publications

(11 citation statements)

References 74 publications

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“…Statistics of the quantities characteristic of the roughness on the surfaces covered with BPA and BTA. Thermal analysis is often used to study materials, especially organic compounds and their composites, a category to which azoic-dye compounds belong [2,59,[105][106][107][108][109][110][111][112]. This time we performed a detailed study of the thermal behavior of BPA and BTA compounds, in the temperature range RT-600 • C. The samples of BPA (0.778 mg) and BTA (1.858 mg) were heated in a dynamic air atmosphere (150 cm −1 min −1 ) with a heating rate of 10 • C min −1 .…”

Section: Ramentioning

confidence: 99%

“…Thermal analysis is often used to study materials, especially organic compounds and their composites, a category to which azoic-dye compounds belong [2,59,[105][106][107][108][109][110][111][112]. This time we performed a detailed study of the thermal behavior of BPA and BTA compounds, in the temperature range RT-600 °C.…”

Section: Thermal Behaviour Of Bpa and Btamentioning

confidence: 99%

“…The mains research on azo compounds refers to their reactivity and stability, as well as their antimicrobial activity. Stability is related to the photochemical [59], thermal [45,59,64,69,70] or enzymatic [59,69] decomposition of the azo compound. Yellow dyes such as tartrazine or sunset yellow have been employed extensively in the food-colouring sector [42], while new candidates are always welcomed; if they prove to have improved physical properties and accomplish safety standards, they may be further used for food preservation, preparation and consumption.…”

Section: Introductionmentioning

confidence: 99%

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Physical, Thermal and Biological Properties of Yellow Dyes with Two Azodiphenylether Groups of Anthracene

et al. 2020

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Two yellow bis-azo dyes containing anthracene and two azodiphenylether groups (BPA and BTA) were prepared, and an extensive investigation of their physical, thermal and biological properties was carried out. The chemical structure was confirmed by the FTIR spectra, while from the UV–Vis spectra, the quantum efficiency of the laser fluorescence at the 476.5 nm was determined to be 0.33 (BPA) and 0.50 (BTA). The possible transitions between the energy levels of the electrons of the chemical elements were established, identifying the energies and the electronic configurations of the levels of transition. Both crystals are anisotropic, the optical phenomenon of double refraction of polarized light (birefringence) taking place. Images of maximum illumination and extinction were recorded when the crystals of the bis-azo compounds rotated by 90° each, which confirms their birefringence. A morphologic study of the thin films deposited onto glass surfaces was performed, proving the good adhesion of both dyes. By thermal analysis and calorimetry, the melting temperatures were determined (~224–225 °C for both of them), as well as their decomposition pathways and thermal effects (enthalpy variations during undergoing processes); thus, good thermal stability was exhibited. The interaction of the two compounds with collagen in the suede was studied, as well as their antioxidant activity, advocating for good chemical stability and potential to be safely used as coloring agents in the food industry.

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Section: Ramentioning

confidence: 99%

Section: Thermal Behaviour Of Bpa and Btamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Physical, Thermal and Biological Properties of Yellow Dyes with Two Azodiphenylether Groups of Anthracene

et al. 2020

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“…Although the expansion of the aromatic conjugate structure can improve the thermal stability of LLM-226, the newly formed diazo structure may bring complex influence on its thermal behaviors. On the one hand, most diazo structures suffer poor stability [20,21] and will lose dinitrogen to afford more stable structures under heating conditions. On the other hand, the introduction of salt structures, especially inner salt structures, has been proved as an efficient approach to improve the thermal stabilities of energetic materials [22,23].…”

Section: Resultsmentioning

confidence: 99%

Comparative Studies on Thermal Decompositions of Dinitropyrazole-Based Energetic Materials

Zhou

Zhang²,

Huo³

et al. 2021

Molecules

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Dinitropyrazole is an important structure for the design and synthesis of energetic materials. In this work, we reported the first comparative thermal studies of two representative dinitropyrazole-based energetic materials, 4-amino-3,5-dinitropyrazole (LLM-116) and its novel trimer derivative (LLM-226). Both the experimental and theoretical results proved the active aromatic N-H moiety would cause incredible variations in the physicochemical characteristics of the obtained energetic materials. Thermal behaviors and kinetic studies of the two related dinitropyrazole-based energetic structures showed that impressive thermal stabilization could be achieved after the trimerization, but also would result in a less concentrated heat-release process. Detailed analysis of condensed-phase systems and the gaseous products during the thermal decomposition processes, and simulation studies based on ReaxFF force field, indicated that the ring opening of LLM-116 was triggered by hydrogen transfer of the active aromatic N-H moiety. In contrast, the initial decomposition of LLM-226 was caused by the rupture of carbon-nitrogen bonds at the diazo moiety.

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“…halogen-or hydrogen-bond donor and acceptor groups [6,14]. The resulting stimuli-responsive lambda-shape linkers are expected to provide tight control over their tunable assembly, chelation, homodimerization or macrocyclization, liquid crystalline [45] and binding [46][47][48] behaviors. Such molecules can also be used as molecular recognition agents and chiral discriminators [49] as the possibilities for the customization of such functionalized TBAs are endless.…”

Section: Discussionmentioning

confidence: 99%

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Kazem‐Rostami

2020

Asian J. Nanosci. Mater.

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Hybridization, functionalization, and enantioseparation of ethano-bridged Tröger base analogs have been performed. X-ray crystallographic analysis, chiral HPLC and CD spectroscopy have assigned the absolute configuration of the obtained ethano-bridged Tröger base analogs, confirming their optical purity. These optically active building blocks are readily modifiable and owing to their versatility they offer unique benefits for the growing community of molecular machinists. KEYWORDS Tröger base Enantioseparation Nitrogen stereocenter Chiral discriminator Graphical AbstractEnantiopure asymmetrically functionalized lambda-shape …

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Factors influencing the thermal stability of azo and bisazo compounds

Cited by 18 publications

References 74 publications

Physical, Thermal and Biological Properties of Yellow Dyes with Two Azodiphenylether Groups of Anthracene

Physical, Thermal and Biological Properties of Yellow Dyes with Two Azodiphenylether Groups of Anthracene

Comparative Studies on Thermal Decompositions of Dinitropyrazole-Based Energetic Materials

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