Thermal features, thermolysis and thermochemistry of hexachlorostannates of some mononitrogen aromatic bases

Janiak, Tadeusz; Błażejowski, Jerzy

doi:10.1016/0040-6031(90)80015-q

Cited by 15 publications

(5 citation statements)

References 44 publications

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“…For these reasons, the differences [D r H/2mR -(T m ) exp ] must be very large, and they decreases, when a 2 = large. Thus, one may note that the quasi-equilibrium conditions prevent accurate determination of enthalpy of reaction D r H, because dynamic conditions directly dictate relationships dominated by activation energy E. Thermal analyses of complex organic compounds in the form of salts containing anion halogens (Cl, Br and J), as described by Bła_ zejowski et al [3,4,[33][34][35][36], behave differently due to the formation of a significant volume of gas (m C 2). These compounds are characterized by thermal decomposition, combined with the total volatilization of gaseous products.…”

Section: Discussionmentioning

confidence: 99%

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Some remarks on equilibrium state in dynamic condition

Mianowski

Baraniec-Mazurek

Bigda

2011

J Therm Anal Calorim

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For dehydration of CaC 2 O 4 ÁH 2 O and thermal dissociation of CaCO 3 carried out in Mettler Toledo TGA/ SDTA-851 e /STAR e thermobalance similar experimental conditions was applied: 9-10 heating rates, q = 0.2, 0.5, 1, 2, 3, 6, 12, 24, 30, and 36 K min-1 , for sample mass 10 mg, in nitrogen atmosphere (100 ml min-1) and in Al 2 O 3 crucibles (70 ll). There were analyzed changes of typical TGA quantities, i.e., T, TG and DTG in the form of the relative rate of reaction/process intended to be analyzed on-line by formula (10). For comparative purposes, the relationship between experimental and equilibrium conversion degrees was used (for P ¼ P É). It was found that the solid phase decomposition proceeds in quasi-equilibrium state and enthalpy of reaction is easily ''obscured'' by activation energy. For small stoichiometric coefficients on gas phase side (here: m = 1) discussed decomposition processes have typical features of phenomena analyzable by known thermokinetic methods.

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Section: Discussionmentioning

confidence: 99%

“…(1) modified van 't Hoff's isobar for thermal dissociation of chemical compounds in solid state [1][2][3][4][5], (2) van Laar-Planck's isotherm [6,7].…”

Section: Introductionmentioning

confidence: 99%

Some remarks on equilibrium state in dynamic condition

Mianowski

Baraniec-Mazurek

Bigda

2011

J Therm Anal Calorim

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“…In order to investigate the thermal stability of (I), thermogravimetric analysis (DTA/TGA) was performed under an N 2 atmosphere at a heating rate of 10 C min À1 in the temperature range from 25 to 500 C. The thermogram of (I) (see Fig. S2 in the supporting information) shows that the compound loses 64.4% of its mass in the temperature range of 270-304 C. The mass loss can be attributed to the degradation of the organic entity and two chlorine atoms (Janiak & Blazejowski, 1990) to leave a reside of SnCl 4 .…”

Section: Thermal Analysismentioning

confidence: 99%

Synthesis, crystal structure and Hirshfeld surface of bis(2-aminopyridinium) hexachloridostannate(IV)

et al. 2020

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In the title molecular salt, (C5H7N2)2[SnCl6], the cation is protonated at the pyridine N atom and the complete dianion is generated by a crystallographic centre of symmetry. In the crystal, N—H...Cl hydrogen bonds link the components into a three-dimensional network built up from the stacking of alternate cationic and anionic layers. The nature of the intermolecular interactions has been analysed in terms of the Hirshfeld surfaces of the cations and the anions. The thermal behaviour and the Raman spectrum of the title compound are reported.

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“…It is then possible to express the equilibrium constant chemical balance by an equilibrium that gives the degree of transformation as [16][17][18]: lnK p ¼ mln a eq À Á ; for a single gas product ð20Þ…”

Section: Analysis Of Eq (12) For Thermal Dissociation Reactionsmentioning

confidence: 99%

“…Finally, the terms diverge when we perform an inversion procedure, like we have done this for Eqs. (15) and (17).…”

Section: Analysis Of Eq (12) For Thermal Dissociation Reactionsmentioning

confidence: 99%

Thermal dissociation in terms of the second law of chemical thermodynamics

Mianowski

Urbańczyk

2016

J Therm Anal Calorim

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Starting from the relationship between Gibbs free energy and equilibrium constant of a chemical reaction (ECCR) and taking into account its temperature dependence according to Kirchhoff, Eq. (12), we arrive at the three-parametric Eq. (26). In going this way, we employ the relationship between the ECCR and the degree of conversion of the solid phase using Eqs. (20) and (21). We find that there is a compensating effect between the coefficients of the equation (i.e., a 1 ; a 2 ) in the form of a linear equation, which has been attributed to the enthalpy-entropy compensation. According to current state of knowledge, this result applies both to the chemical reactions resulting in individual chemical bond formation as well as in thermal decomposition. When the heat capacity of such chemical reactions decreases linearly along with temperature, it can adopt the value of the (arithmetic mean) average, and the negative sign determines the elements of the functional equations valid for theoretical (Eq. 26) and experimentally fit (Eq. 32) states. For calcite, several possibilities arising from equilibrium changes in the conversion rate vs. temperature are compared by taking into account the CDV L'vov theory.

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Thermal features, thermolysis and thermochemistry of hexachlorostannates of some mononitrogen aromatic bases

Cited by 15 publications

References 44 publications

Some remarks on equilibrium state in dynamic condition

Some remarks on equilibrium state in dynamic condition

Synthesis, crystal structure and Hirshfeld surface of bis(2-aminopyridinium) hexachloridostannate(IV)

Thermal dissociation in terms of the second law of chemical thermodynamics

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