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Related Concept Videos

Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group with both...
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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
Due to the absence of continuous overlap of p...
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Protein Organization

Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
The primary structure of a protein is its amino acid sequence.

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Decoding Heptazine Architectures: From Molecular Association to Structural Insight.

Silvia Del Moral1,2, Daniel Barrena-Espés3, Julen Munarriz4

  • 1Instituto de Nanociencia y Materiales De Aragón (INMA), CSIC-Universidad De Zaragoza, Zaragoza, Spain.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|July 3, 2026
PubMed
Summary
This summary is machine-generated.

Chirality and structure in heptazine (Hpz) derivatives influence their supramolecular assembly and optical properties. Subtle changes tune aggregation, emission, and liquid crystalline behavior, showcasing Hpz versatility for advanced materials.

Keywords:
AIE‐behaviorNMR spectroscopydimerizationmolecular dynamicssmectic mesophase

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Analyzing Protein Architectures and Protein-Ligand Complexes by Integrative Structural Mass Spectrometry
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Published on: October 15, 2018

Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Organic Chemistry

Background:

  • Heptazine (Hpz) derivatives exhibit significant supramolecular organization driven by noncovalent interactions.
  • Understanding how molecular structure impacts self-assembly is crucial for designing functional materials.

Purpose of the Study:

  • To investigate the influence of molecular chirality and structural variations on the self-association and organization of Hpz derivatives.
  • To explore the resulting supramolecular, optical, and mesomorphic properties.

Main Methods:

  • Variable-temperature and concentration-dependent Nuclear Magnetic Resonance (NMR) spectroscopy to determine aggregation constants and thermodynamic parameters.
  • Computational studies including conformational analysis and molecular dynamics.
  • Photophysical studies to assess aggregation-induced emission (AIE).
  • Circular Dichroism (CD) spectroscopy and polarized optical microscopy for chiral and liquid crystalline behavior analysis.

Main Results:

  • NMR and computational studies quantified dimerization and aggregation, confirming dimer stability.
  • Observed aggregation-induced emission (AIE) with blue light emission upon association.
  • Chiral Hpz derivatives showed mirror-image CD responses, indicating retained bulk chirality.
  • The nonchiral analogue exhibited liquid crystalline (LC) behavior with a smectic mesophase.

Conclusions:

  • Subtle structural modifications in Hpz derivatives significantly modulate their supramolecular, optical, and mesomorphic characteristics.
  • The heptazine core is a versatile platform for developing multifunctional supramolecular and optoelectronic materials.
  • Chirality plays a key role in dictating the self-assembly and chiroptical properties of Hpz systems.