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Amino acids03:42

Amino acids

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Amino acids are the monomers that comprise proteins. Each amino acid has the same fundamental structure, which consists of a central carbon atom, or the alpha (α) carbon, bonded to an amino group (NH2), a carboxyl group (COOH), and to a hydrogen atom. Every amino acid also has another atom or group of atoms bonded to the central atom known as the R group. There are 20 common amino acids present in proteins, each with a different R group. Variation in the amino acid sequence is responsible...
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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Acid Halides to Amides: Aminolysis01:07

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Aminolysis is a nucleophilic acyl substitution reaction, where ammonia or amines act as nucleophiles to give the substitution product. Acid halides react with ammonia, primary amines, and secondary amines to yield primary, secondary, and tertiary amides, respectively.
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Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...
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Polymer Classification: Crystallinity01:21

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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
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Preparation of Monodomain Liquid Crystal Elastomers and Liquid Crystal Elastomer Nanocomposites
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Preparation of Monodomain Liquid Crystal Elastomers and Liquid Crystal Elastomer Nanocomposites

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Ionic liquid crystals derived from amino acids.

Markus Mansueto1, Wolfgang Frey, Sabine Laschat

  • 1Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart (Germany), Fax: (+49) 711-685-64285.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|October 15, 2013
PubMed
Summary
This summary is machine-generated.

Novel ionic liquid crystals derived from chiral amino acids were synthesized. These compounds exhibit smectic A liquid crystal phases, with structure influenced by steric bulk and specific amino acid side chains like phenylalanine.

Keywords:
amino acidsamino alcoholschiral poolionic liquidsliquid crystals

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Crystallography

Background:

  • Ionic liquid crystals (ILCs) are salts with low melting points that exhibit liquid crystalline properties.
  • Chiral amino acids offer unique structural motifs for designing functional materials.
  • Developing novel ILCs with tunable mesomorphic behavior is crucial for advanced applications.

Purpose of the Study:

  • To synthesize novel chiral amino acid-derived ionic liquid crystals.
  • To investigate the influence of structural modifications, including steric bulk and spacer moieties, on mesomorphic properties.
  • To explore the role of specific amino acid residues, such as phenylalanine, in stabilizing liquid crystalline phases.

Main Methods:

  • Synthesis of ionic liquid crystals utilizing microwave-assisted reactions with an SO3 leaving group.
  • Characterization of mesomorphic properties using differential scanning calorimetry (DSC) and polarising optical microscopy (POM).
  • Structural analysis of liquid crystalline phases via X-ray diffraction.

Main Results:

  • Successful synthesis of chiral amino acid-derived ionic liquid crystals featuring amine and amide linkers.
  • All synthesized compounds displayed a smectic A mesophase with interdigitated bilayer structures.
  • Increased steric bulk at the stereogenic center of the amino acid moiety inhibited mesophase formation.
  • Phenylalanine-derived ILCs showed mesomorphism with shorter alkyl chains, suggesting a stabilizing effect from the phenyl group.

Conclusions:

  • Chiral amino acid structure significantly impacts the formation and stability of ionic liquid crystal mesophases.
  • The SO3 leaving group and microwave-assisted synthesis provide an efficient route to these novel materials.
  • Interdigitated bilayer structures in the smectic A phase are characteristic of these amino acid-derived ILCs.