scholarly journals GRAPHIC DEPENDENCES IN THE STUDY OF STRUCTURE - PROPERTIES OF GLYCOLS

2021 ◽  
pp. 123-131
Author(s):  
Марина Геннадьевна Виноградова ◽  
Рада Романовна Козлова
Keyword(s):  
Enthalpy Of Formation ◽  
Chemical Structure ◽  
Topological Index ◽  
The Relationship ◽  
The Enthalpy Of Formation ◽  
Structure Properties

Обсуждается взаимосвязь энтальпии образования двухатомных спиртов с различными факторами химического строения. Построены и проанализированы графические зависимости «Энтальпия образования - топологический индекс (ТИ)», «Энтальпия образования - номер изомера» и «Топологический индекс - номер изомера». Показано, что в одних случаях энтальпия образования хорошо коррелирует с ТИ, а в других случаях такой зависимости нет. The relationship between the enthalpy of formation of dihydric alcohols and various factors of chemical structure is discussed. Graphical dependencies "Enthalpy of formation - topological index (TI)", "Enthalpy of formation - isomer number" and "Topological index - isomer number" were constructed and analyzed. It was shown that in some cases the enthalpy of formation correlates well with TI, while in other cases there is no such dependence.

Formation Enthalpy, Free-Energy and Activity Coefficients of Sn-Pb Eutectic Solders

2009 ◽  
Vol 610-613 ◽  
pp. 531-536 ◽  
Author(s):  
Gui Sheng Gan ◽  
Fang Chen ◽  
Rong Chang Zeng ◽  
Yun Fei Du ◽  
Chang Hua Du
Keyword(s):  
Free Energy ◽  
High Temperature ◽  
Enthalpy Of Formation ◽  
Activity Coefficients ◽  
Excess Free Energy ◽  
Formation Enthalpy ◽  
Chemical Activity ◽  
Lead Pollution ◽  
The Relationship ◽  
The Enthalpy Of Formation

Based on Miedema’s model, the enthalpy of formation, excess free-energy and partial molar excess free-energy of Sn-Pb binary alloy solders were calculated. The model of the activity coefficient for each component in the solders was established. The diagrams of enthalpy of formation, free energy versus composition and activity versus composition and temperature as well as activity coefficients as a function of composition and/or temperature were drawn. And then the relationship between the activity coefficients of elements Sn/Pb in the solders and temperature was obtained. The approaches to reduction in the volatilization of lead at high temperature were proposed from the point of views that the lead pollution to environment results from its chemical activity in the solder alloys.

Structure-properties relationship for energy storage redox polymers: a review

2020 ◽  
Vol 40 (5) ◽  
pp. 373-393 ◽  
Author(s):  
Narendra Singh Chundawat ◽  
Nishigandh Pande ◽  
Ghasem Sargazi ◽  
Mazaher Gholipourmalekabadi ◽  
Narendra Pal Singh Chauhan
Keyword(s):  
Energy Storage ◽  
Cost Efficiency ◽  
Energy Storage Materials ◽  
High Scale ◽  
Chemical Structures ◽  
Redox Active ◽  
Potential Applications ◽  
Intelligent Clothing ◽  
The Relationship ◽  
Structure Properties

AbstractRedox-active polymers among the energy storage materials (ESMs) are very attractive due to their exceptional advantages such as high stability and processability as well as their simple manufacturing. Their applications are found to useful in electric vehicle, ultraright computers, intelligent electric gadgets, mobile sensor systems, and portable intelligent clothing. They are found to be more efficient and advantageous in terms of superior processing capacity, quick loading unloading, stronger security, lengthy life cycle, versatility, adjustment to various scales, excellent fabrication process capabilities, light weight, flexible, most significantly cost efficiency, and non-toxicity in order to satisfy the requirement for the usage of these potential applications. The redox-active polymers are produced through organic synthesis, which allows the design and free modification of chemical constructions, which allow for the structure of organic compounds. The redox-active polymers can be finely tuned for the desired ESMs applications with their chemical structures and electrochemical properties. The redox-active polymers synthesis also offers the benefits of high-scale, relatively low reaction, and a low demand for energy. In this review we discussed the relationship between structural properties of different polymers for solar energy and their energy storage applications.

Thermochemistry of Organic and Heteroorganic Species. Part IX. Photoionization Studies of Isomerization and Fragmentation of Polysubstituted Cyclopropenes: Phenyl-Substituted Cyclopropenes

2000 ◽  
Vol 6 (1) ◽  
pp. 53-64 ◽  
Author(s):  
V.V. Takhistov ◽  
I.N. Domnin ◽  
D.A. Ponomarev
Keyword(s):  
Mass Spectrometry ◽  
Enthalpy Of Formation ◽  
Good Alternative ◽  
Enthalpies Of Formation ◽  
Isodesmic Reactions ◽  
Ion Structure ◽  
Photoionization Mass Spectrometry ◽  
General Methodology ◽  
Fragment Ions ◽  
The Enthalpy Of Formation

Ionization and appearance energies of some fragment ions from 1,2,3-trimethy1-3-phenyl-, 3-methyl-1,2,3-triphenyl-, 1,2-diphenyl-3-methoxycarbonyl-, 1,2,3-triphenyl-3-methoxycarbonyl- and 1,3,3-triphenyl-2-methoxycarbonyl-cyclopropenes were measured by photoionization mass spectrometry. It was shown that in none of these compounds did the fragment ions possess the expected stable substituted cyclopropenium ion structure. Accordingly, possible schemes of molecular ion isomerization are given. The enthalpies of formation of nearly 50 substituted cyclopropenium ions, and ions of related structure, were estimated using series of isodesmic reactions. This publication, together with the previous works of the authors in this Journal, demonstrates the general methodology for estimation of the enthalpy of formation for even-electron ions. It is suggested that the present methodology can provide a good alternative to other estimation or computation procedures applied to the thermochemistry of ions.

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