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Related Concept Videos

Structural Isomerism02:34

Structural Isomerism

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
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Work Done on a System by External Force01:11

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The work done by an external force on a particle changes its kinetic energy. However, internal forces must also be considered for a system of interacting particles. The potential energy formulation helps formulate the effect of internal forces. The net work done by an external force can be written in terms of the total change of mechanical energy, which includes both kinetic and potential energies.
In the presence of a non-conservative opposing force, like friction, some part of the work done...
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Internal and External Forces01:12

Internal and External Forces

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Newton's first law states that a net external force causes a change in motion. External forces act on an object or system, originating outside of the object or system. In contrast, internal forces originate inside the system of interest and do not lead to any acceleration. In simpler words, internal forces are forces that act on one part of an object and are exerted by another part of the same object. External forces are forces that act on an object due to some other object. Therefore, when...
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Synthesis and decomposition are two types of redox reactions. Synthesis means to make something, whereas decomposition means to break something. The reactions are accompanied by chemical and energy changes. 
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Isomerism02:43

Isomerism

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Isomers are molecules with the same molecular formula but different structural arrangements. Isomers can be further classified into constitutional isomers and stereoisomers. Constitutional isomers differ in the connectivity of their constituent atoms. For example, 2-butanol and diethyl ether are constitutional isomers, as they have the same chemical formula, C4H10O, but differ in the connectivity of the carbon and oxygen atoms. Constitutional isomers have different physical and chemical...
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Isomerism in Alkenes02:01

Isomerism in Alkenes

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Alkenes like 1-butene and 2-butene exhibit constitutional isomerism, as they differ in the position of the double bond. Further, 2-butene exhibits stereoisomerism and exists as two distinct compounds differing in spatial arrangement.
An isomer is called cis-2-butene when the methyl groups are on the same side of the double bond, and the other stereoisomer, in which methyl groups are on the opposite side of the double bond, is called trans-2-butene. The cis and trans stereoisomers are not...
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Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter
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Isomerization and Decomposition of 2-Methylfuran with External Forces.

Agnieszka Brzyska1, Krzysztof Woliński2

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The Standard and Enforced Geometry Optimization (SEGO) method efficiently maps molecular potential energy surfaces. Applied to 2-methylfuran (2MF), SEGO revealed numerous novel isomers and decomposition products relevant to biofuel research.

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Area of Science:

  • Computational Chemistry
  • Chemical Physics
  • Materials Science

Background:

  • The Standard and Enforced Geometry Optimization (SEGO) method is a novel computational tool.
  • Its capability for locating multiple minima on molecular Potential Energy Surfaces (PES) was previously shown for only three molecules.
  • Understanding the Potential Energy Surface (PES) of 2-methylfuran (2MF) is crucial for studying its pyrolysis as a potential biofuel.

Purpose of the Study:

  • To evaluate the performance of the SEGO method.
  • To explore the 2-methylfuran (2MF) Potential Energy Surface (PES).
  • To identify isomers and decomposition products of 2MF.

Main Methods:

  • Application of the newly developed Standard and Enforced Geometry Optimization (SEGO) method.
  • Exploration of the 2-methylfuran (2MF) Potential Energy Surface (PES).
  • Automatic identification of local minima and chemical structures via enforced chemical reactions.

Main Results:

  • The SEGO method was successfully applied to explore the 2MF PES.
  • A large number of local minima, including isomers and decomposition products of 2MF, were located.
  • Novel and unusual structures of 2MF isomers and fragments were discovered.

Conclusions:

  • The SEGO method is a highly efficient tool for exploring complex molecular Potential Energy Surfaces (PES).
  • This study provides comprehensive knowledge of the 2MF PES, including previously unknown isomers and decomposition pathways.
  • The findings are significant for understanding the pyrolysis of 2MF as a biofuel candidate.