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π Molecular Orbitals of 1,3-Butadiene01:24

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Conjugated dienes have lower heats of hydrogenation than cumulated and isolated dienes, making them more stable. The enhanced stabilization of conjugated systems can be understood from their π molecular orbitals.
The simplest conjugated diene is 1,3-butadiene: a four-carbon system where each carbon is sp2-hybridized and has an unhybridized p orbital that contains an unpaired electron. According to molecular orbital theory, atomic orbitals combine to form molecular orbitals such that the number...
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Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
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A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
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Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.
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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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Hydrogen-bonded π-conjugated supramolecular polymers.

Pedro Ximenis1, Daniel Martínez1, Llorenç Rubert1

  • 1Department of Chemistry, Universitat de les Illes Balears, 07122 Palma de Mallorca, Spain. b.soberats@uib.es.

Chemical Society Reviews
|November 14, 2025
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Summary
This summary is machine-generated.

Hydrogen-bonding (H-bonding) in π-conjugated molecules precisely controls self-assembly for advanced functional materials. This review guides rational design of ordered supramolecular materials by exploring H-bonding strategies and their impact on assembly kinetics and structure.

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Organic Electronics

Background:

  • π-conjugated molecules self-assemble via π-π stacking, forming functional materials.
  • Hydrogen-bonding (H-bonding) is a key strategy to control self-assembly and create ordered supramolecular structures.
  • H-bonding offers specificity and directionality, enabling well-ordered and stable assemblies like supramolecular polymers.

Purpose of the Study:

  • To review recent advances in design strategies using H-bonding chromophores for π-conjugated molecules.
  • To discuss how monomer design and experimental conditions influence self-assembly behavior, molecular packing, and morphology.
  • To explore the thermodynamic and kinetic aspects of H-bonding in self-assembly, including pathway complexity and supramolecular polymorphism.

Main Methods:

  • Literature review of recent research on H-bonding in π-conjugated systems.
  • Analysis of design strategies for controlling self-assembly through H-bonding.
  • Discussion of experimental factors affecting molecular packing and assembly morphology.
  • Examination of kinetic phenomena like secondary nucleation and living supramolecular polymerization.

Main Results:

  • H-bonding provides precise control over the self-assembly of π-conjugated molecules.
  • Monomer design and experimental conditions significantly impact the resulting supramolecular structures and morphologies.
  • H-bonding influences both the thermodynamics and kinetics of self-assembly, leading to complex phenomena.
  • Strategies leveraging H-bonding enable the formation of well-defined supramolecular polymers and ordered materials.

Conclusions:

  • Rational design of π-conjugated supramolecular materials is achievable by strategically incorporating H-bonding.
  • Understanding H-bonding's role in kinetics and thermodynamics is crucial for controlling self-assembly pathways.
  • This review provides a comprehensive overview to guide future research in hierarchically ordered π-conjugated materials.