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Related Concept Videos

Recrystallization: Solid–Solution Equilibria01:10

Recrystallization: Solid–Solution Equilibria

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Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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Weak Base Solutions03:21

Weak Base Solutions

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Some compounds produce hydroxide ions when dissolved by chemically reacting with water molecules. In all cases, these compounds react only partially and so are classified as weak bases. These types of compounds are also abundant in nature and important commodities in various technologies. For example, global production of the weak base ammonia is typically well over 100 metric tons annually, being widely used as an agricultural fertilizer, a raw material for chemical synthesis of other...
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Strong Acid and Base Solutions03:22

Strong Acid and Base Solutions

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A strong acid is a compound that dissociates completely in an aqueous solution and produces a concentration of hydronium ions equal to the initial concentration of acid. For example, 0.20 M hydrobromic acid will dissociate completely in water and produces 0.20 M of hydronium ions and 0.20 M of bromide ions.
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Solution Composition During Acid/Base Titrations01:17

Solution Composition During Acid/Base Titrations

1.6K
The titration of a weak acid with a strong base results in the formation of water and the conjugate base of the acid. For instance, titrating acetic acid with sodium hydroxide leads to the formation of water and sodium acetate. A solution of acetic acid and sodium acetate constitutes a buffer whose relative concentration at different stages of the titration is indicated by the α values, which represent percentages of the weak acid and its conjugate base.
The α0 and α1 values...
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Leveling Effect and Non-Aqueous Acid-Base Solutions02:11

Leveling Effect and Non-Aqueous Acid-Base Solutions

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This lesson defines the leveling effect in acidic and basic solutions and its role in aqueous and non-aqueous solutions. It is essential to understand the competing nature of various species in a chemical system.
The Leveling Effect of a Solvent
A generic acid (HA) reacts with the generic base (B-) to yield the corresponding conjugate base (A-) and conjugate acid (HB):
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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
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Polymorphic self-assembly of pyrazine-based tectons at the solution-solid interface.

Achintya Jana1, Puneet Mishra2, Neeladri Das1

  • 1Indian Institute of Technology Patna, Bihta, Patna-801106, India.

Beilstein Journal of Nanotechnology
|March 16, 2019
PubMed
Summary
This summary is machine-generated.

Researchers synthesized a new pyrazine-derived molecule for surface self-assembly. Polymorphic structures formed on a graphite surface due to hydrogen bonding and substrate interactions.

Keywords:
highly oriented pyrolytic graphite (HOPG)organic moleculespyrazinepyridinesscanning tunneling microscopyself-assembly

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Area of Science:

  • Supramolecular chemistry
  • Surface science
  • Materials chemistry

Background:

  • Surface self-assembly of small molecules is key for creating functional molecular devices.
  • Understanding molecular interactions is vital for designing ordered structures.

Purpose of the Study:

  • To synthesize and investigate the surface self-assembly behavior of a novel pyrazine-derived molecule with pyridine pendants.
  • To explore the factors influencing the formation of different molecular packing structures.

Main Methods:

  • Synthesis of the pyrazine-derived molecule.
  • Ambient scanning tunneling microscopy (STM) at the solution-solid interface.
  • Analysis of molecular packing and intermolecular interactions on a highly oriented pyrolytic graphite (HOPG) substrate.

Main Results:

  • The molecule exhibited polymorphic self-assembly on the HOPG substrate.
  • Two distinct molecular packing structures were observed with equal distribution.
  • Weak intermolecular hydrogen bonding and molecule-substrate interactions were identified as critical factors in polymorph formation.

Conclusions:

  • The study demonstrates the formation of diverse supramolecular structures through surface self-assembly.
  • Weak hydrogen bonding is crucial for creating modular and error-correcting supramolecular architectures.
  • This work contributes to the design principles for surface-supported molecular devices.