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A crystal's internal structure is an orderly array of atoms, ions, or molecules, and the details of this array significantly influence the solid's properties. In a crystal, periodically repeating 'structural motifs' - which could be atoms, molecules, or groups thereof - create a 'space lattice.' This is essentially a three-dimensional, infinite array of points, each surrounded by its neighbors in an identical way, forming the basic structure of the crystal.A 'unit cell' is a theoretical...
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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Crystal structure of a methimazole-based ionic liquid.

Jamie C Gaitor1, Manuel Sanchez Zayas1, Darrel J Myrthil1

  • 1Department of Chemistry and Physics, Florida Gulf Coast University, Fort Myers, FL 33965, USA.

Acta Crystallographica. Section E, Crystallographic Communications
|February 13, 2016
PubMed
Summary
This summary is machine-generated.

This study determined the crystal structure of 1-methyl-2-(prop-2-en-1-ylsulfan-yl)-1H-imidazol-3-ium bromide. The findings confirm methimazole reacts via its thione tautomer, not the thiol form.

Keywords:
S-allyl­ationcrystal structureionic liquidsmethimazolenitro­gen heterocycle

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Area of Science:

  • Crystallography
  • Organic Chemistry
  • Chemical Physics

Background:

  • Methimazole is a key pharmaceutical compound.
  • Understanding its tautomeric forms is crucial for reaction mechanism elucidation.
  • Previous studies have debated the reactive tautomer of methimazole.

Purpose of the Study:

  • To elucidate the crystal structure of 1-methyl-2-(prop-2-en-1-ylsulfan-yl)-1H-imidazol-3-ium bromide.
  • To definitively determine the tautomeric form of methimazole involved in the reaction system.

Main Methods:

  • Single-crystal X-ray diffraction analysis.
  • Crystallographic symmetry determination (monoclinic, P21/c).
  • Identification of intermolecular interactions (N-H⋯Br and C-H⋯Br hydrogen bonds).

Main Results:

  • The crystal structure of the title compound was successfully determined.
  • The compound exhibits monoclinic (P21/c) symmetry.
  • Hydrogen bonding interactions were observed between the components.

Conclusions:

  • The crystal structure provides undeniable proof of the reaction pathway.
  • Methimazole reacts through its thione tautomer in this specific system.
  • This finding resolves ambiguity regarding methimazole's reactive form.