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Constitutional Isomers of Alkanes02:18

Constitutional Isomers of Alkanes

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Organic compounds of the same molecular formula can have different structural formulas called constitutional isomers, and the phenomenon is known as constitutional isomerism. Alkanes with four or more carbons showing multiple structures with the same molecular formula thereby exhibit constitutional isomerism.
The linear isomer of an alkane is prefixed by the term “n”; hence a linear isomer of pentane is known as n-pentane. Based on the type of branching, some of the...
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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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The position of an object defines its location relative to a convenient frame of reference at any particular time. A frame of reference is an arbitrary set of axes from which the position and motion of an object are described. Earth is often used as a frame of reference, and we often describe the position of an object as it relates to stationary objects on Earth. For example, a rocket launch could be described in terms of the position of the rocket with respect to Earth as a whole. On the other...
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The serial position effect is a cognitive phenomenon where individuals are more likely to recall the first and last items in a list compared to those in the middle. This effect is divided into the primacy effect and the recency effect. The primacy effect is observed when the initial items in a list are remembered better. This occurs because these items are rehearsed more frequently or receive more elaborative processing, allowing them to be encoded into long-term memory more effectively. For...
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A position vector is a fundamental concept in mathematics that helps determine the position of one point with respect to another point in space. It is a vector that describes the direction and distance between two points. Position vectors are highly useful in the field of math and science, as they help represent spatial relationships and make calculations easier.
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In anatomy, several standard anatomical positions are used as references for describing the position and orientation of different body parts. These positions help provide a common frame of reference when discussing anatomical structures. The anatomical position is the standard reference point for describing the body's position and orientation. In this position:
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Synthesis and Structure Determination of µ-Conotoxin PIIIA Isomers with Different Disulfide Connectivities
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Dihydroindenofluorene Positional Isomers.

Cyril Poriel1, Joëlle Rault-Berthelot1

  • 1Univ Rennes, CNRS, ISCR-6226 , F-35000 Rennes , France.

Accounts of Chemical Research
|July 19, 2018
PubMed
Summary

Positional isomerism in dihydroindenofluorenes significantly tunes electronic properties for organic electronics. Exploring these isomers reveals their potential for advanced organic semiconductors and light-emitting diodes.

Area of Science:

  • Organic electronics
  • Materials science
  • Organic semiconductor chemistry

Background:

  • Bridged oligophenylenes, particularly fluorene derivatives, are key organic semiconductors (OSCs) in organic electronics (OE).
  • Dihydroindenofluorenes, a class of bridged terphenyls, are promising building blocks for OE applications.
  • Five positional isomers of dihydroindenofluorenes exist, differing in phenyl linkage (para, meta, ortho) and bridge arrangement (anti, syn).

Purpose of the Study:

  • To explore the molecular diversity and electronic properties of five dispirofluorene-indenofluorene positional isomers.
  • To investigate the impact of positional isomerism on the synthesis and electronic properties of dihydroindenofluorenes.
  • To demonstrate positional isomerism as a tool for tuning OSC properties.

Main Methods:

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  • Structure-property relationship analysis.
  • Organic synthesis of dihydroindenofluorene isomers.
  • Characterization of electronic properties.

Main Results:

  • The para-syn isomer (11,12-Dihydroindeno[2,1-a]fluorene) shows potential for stable blue emission via intramolecular excimers.
  • Meta isomers highlight the strong impact of linkage and geometry on electronic properties.
  • The ortho isomer (5,8-Dihydroindeno[2,1-c]fluorene) exhibits a unique helicoidal structure due to its ortho linkage.
  • Significant differences in electronic properties arise from structural variations among the isomers.

Conclusions:

  • Positional isomerism is a powerful strategy for tuning the electronic properties of organic semiconductors.
  • Dihydroindenofluorenes offer diverse structural scaffolds for advanced organic electronic materials.
  • Further research into understudied isomers can unlock new applications in OE.