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Peptidoglycan Synthesis01:28

Peptidoglycan Synthesis

Structure of PeptidoglycanPeptidoglycan is a vital structural component of the bacterial cell wall, providing mechanical strength and shape to the cell. It consists of repeating units of two sugars—N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM)—linked by β-1,4 glycosidic bonds. These sugar chains are cross-linked by short peptide chains, forming a mesh-like polymer that surrounds the bacterial plasma membrane.Cytoplasmic Phase – Precursor SynthesisPeptidoglycan biosynthesis begins in...

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Glycine-phthalic acid (1/1).

T Balakrishnan1, K Ramamurthi, S Thamotharan

  • 1School of Physics, Bharathidasan University, Tiruchirappalli 620 024, India.

Acta Crystallographica. Section E, Structure Reports Online
|March 12, 2013
PubMed
Summary
This summary is machine-generated.

This study reveals the crystal structure of a glycine-phthalic acid compound. Glycine molecules form zwitterions, interacting with phthalic acid via hydrogen bonds to create layered structures.

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Area of Science:

  • Crystallography
  • Supramolecular Chemistry
  • Chemical Physics

Background:

  • Glycine, an amino acid, can form zwitterions with charged amino and carboxylate groups.
  • Phthalic acid is a dicarboxylic acid commonly used in chemical synthesis.
  • Understanding the crystal packing of organic molecules is crucial for materials science.

Purpose of the Study:

  • To elucidate the crystal structure of the glycine-phthalic acid co-crystal.
  • To investigate the intermolecular interactions, specifically hydrogen bonding, within the crystal lattice.
  • To describe the self-assembly of glycine zwitterions and phthalic acid molecules.

Main Methods:

  • Single-crystal X-ray diffraction was employed to determine the molecular and crystal structure.
  • Analysis of hydrogen bonding networks (N-H⋯O and O-H⋯O) was performed.
  • The arrangement of molecules in the crystal lattice was visualized and described.

Main Results:

  • The compound crystallizes as a 1:1 adduct of glycine and phthalic acid (C2H5NO2·C8H6O4).
  • Glycine exists as a zwitterion (2-aza-niumyl-ethano-ate) in the crystal structure.
  • Hydrogen bonds link glycine zwitterions and phthalic acid molecules into layers parallel to the ab plane.
  • Phthalic acid molecules are positioned such that their benzene rings extend outwards from the layered structure.

Conclusions:

  • The study provides detailed structural insights into the glycine-phthalic acid co-crystal.
  • The observed hydrogen bonding network dictates the formation of a layered supramolecular architecture.
  • The arrangement highlights the interplay between zwitterionic glycine and phthalic acid in crystal engineering.