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Adrenergic Agonists: Chemistry and Structure-Activity Relationship01:16

Adrenergic Agonists: Chemistry and Structure-Activity Relationship

Adrenergic agonists' structure-activity relationship (SAR) determines their selectivity and efficacy. These agonists comprise a phenylethylamine moiety with an aromatic ring and an ethylamine side chain.
Aromatic ring substitutions: Substituting the aromatic ring with –OH groups at positions 3 and 4 yields catecholamines (e.g., epinephrine), which have a high affinity for adrenoceptors. Hydrogen bonding between –OH groups and receptors enhances adrenergic activity.
Separation of the aromatic...

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Related Experiment Video

Updated: May 21, 2026

Recording Gamma Band Oscillations in Pedunculopontine Nucleus Neurons
09:04

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Published on: September 14, 2016

Caffeine-N-phthaloyl-β-alanine (1/1).

Moazzam H Bhatti, Uzma Yunus, Syed Raza Shah

    Acta Crystallographica. Section E, Structure Reports Online
    |June 22, 2012
    PubMed
    Summary

    This study details a new co-crystal formed by N-phthaloyl-β-alanine and caffeine. The crystal structure reveals specific hydrogen bonding and molecular arrangements, offering insights into co-crystal formation.

    Area of Science:

    • Crystallography
    • Materials Science
    • Supramolecular Chemistry

    Background:

    • Co-crystals are crystalline solids composed of two or more different molecules in a defined stoichiometric ratio.
    • Caffeine, a widely consumed stimulant, and N-phthaloyl-β-alanine are molecules with potential for co-crystal formation due to their functional groups.

    Purpose of the Study:

    • To synthesize and characterize a novel co-crystal of N-phthaloyl-β-alanine and caffeine.
    • To elucidate the crystal structure and intermolecular interactions within this co-crystal.

    Main Methods:

    • Single-crystal X-ray diffraction was employed to determine the molecular and crystal structure.
    • Analysis of intermolecular interactions, including hydrogen bonding and van der Waals forces, was performed.

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    Main Results:

    • A 1:1 co-crystal of N-phthaloyl-β-alanine and caffeine was successfully synthesized and characterized.
    • The crystal structure exhibits planar phthalimide and purine rings, with molecules linked by an O-H⋯N hydrogen bond.
    • C-H⋯O interactions further stabilize the crystal lattice, and caffeine methyl groups show disorder.

    Conclusions:

    • The formation of the N-phthaloyl-β-alanine-caffeine co-crystal is driven by specific hydrogen bonding and other intermolecular forces.
    • Understanding these interactions is crucial for designing new co-crystals with tailored properties.