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An understanding of the solvating effect helps rationalize the relation between solvation and acidity of the compound. In addition, this also explains the relative stability of conjugate bases for compounds with different pKa values. This lesson details, in-depth, the principle of solvating effects. The strength of an acid and the stability of its corresponding conjugate base are determined using pKa values. This observed relationship is a consequence of solvation, which is the interaction...
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Ethidium benzoate methanol monosolvate.

Runa Shimazaki1, Masaaki Sadakiyo1

  • 1Department of Applied Chemistry, Faculty of Science Division I, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo, 162-8601, Japan.

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|May 9, 2024
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Summary
This summary is machine-generated.

Ethidium cations in a benzoate methanol salt solvate dimerize via pi-pi interactions. These interactions form a one-dimensional hydrogen-bonded chain involving ethidium, benzoate, and methanol molecules.

Keywords:
benzoatecrystal structureethidium salthydrogen bonding

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Area of Science:

  • Crystallography
  • Supramolecular Chemistry
  • Chemical Physics

Background:

  • Ethidium, a fluorescent intercalating agent, is widely used in molecular biology.
  • Understanding the solid-state behavior of ethidium salts is crucial for its applications.
  • Salt solvates offer unique crystalline structures influenced by counterions and solvent molecules.

Purpose of the Study:

  • To elucidate the crystal structure of the ethidium benzoate methanol monosolvate.
  • To investigate the intermolecular interactions governing the self-assembly of ethidium cations in the solid state.
  • To characterize the hydrogen bonding network within the crystal lattice.

Main Methods:

  • Single-crystal X-ray diffraction analysis was employed to determine the three-dimensional structure.
  • Analysis of crystallographic data was performed to identify non-covalent interactions.
  • Inter-centroid separation and hydrogen bond distances/angles were precisely measured.

Main Results:

  • The crystal structure reveals the dimerization of ethidium cations through face-to-face pi-pi stacking interactions with an inter-centroid separation of 3.6137(4) Å.
  • Benzoate anions engage in hydrogen bonding with the amino groups of ethidium cations and the hydroxyl group of methanol.
  • Methanol molecules act as hydrogen bond acceptors from ethidium amino groups, facilitating the formation of a 1D chain.

Conclusions:

  • The study demonstrates the propensity of ethidium cations to dimerize in the solid state via pi-pi interactions.
  • A complex hydrogen bonding network involving ethidium, benzoate, and methanol dictates the overall crystal packing.
  • The formation of a one-dimensional hydrogen-bonded chain along the b-axis is a key structural feature of this salt solvate.