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Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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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...
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¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

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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.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
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Disubstituted Cyclohexanes: cis-trans Isomerism02:37

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12.6K
Depending upon the different spatial orientation of the substituents, the disubstituted cycloalkanes exhibit two types of stereoisomers. The cis isomers have the substituents on the same side of the ring, whereas the trans isomers have the substituents on the opposite sides. These stereoisomers exhibit different physical properties and cannot be interconverted without breaking the carbon-carbon bonds.
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UV–Vis Spectroscopy: Woodward–Fieser Rules01:29

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UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given...
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Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

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2.2K
Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
2.2K
Cycloalkanes02:28

Cycloalkanes

13.8K
Cycloalkanes are saturated cyclic hydrocarbons with carbon atoms arranged in the form of rings. They have two fewer hydrogen atoms than the corresponding acyclic alkane; therefore, their general formula is CnH2n. The structural formulas of cycloalkanes are simplified using the line-angle representation. The regular polygons are used to represent the cycloalkane rings, with each side representing a carbon-carbon bond.
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Updated: Sep 25, 2025

Synthesis of Soft Polysiloxane-urea Elastomers for Intraocular Lens Application
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Poly(cyclosilane) Connectivity Tunes Optical Absorbance.

Fan Fang1, Qifeng Jiang1, Rebekka S Klausen1

  • 1Department of Chemistry, Johns Hopkins University, 3400 N. Charles St, Baltimore, Maryland 21218, United States.

Journal of the American Chemical Society
|April 25, 2022
PubMed
Summary
This summary is machine-generated.

Skeletal connectivity in cyclosilanes influences their optical properties. Different linkages (1,3- vs. 1,4-) alter conformation and absorption spectra, enabling tunable optoelectronic materials.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Computational Chemistry

Background:

  • Polysilane optical properties are strongly conformation-dependent.
  • Skeletal connectivity influences polymer conformation and thus optoelectronic behavior.

Purpose of the Study:

  • To investigate the impact of skeletal connectivity on cyclosilane conformation and optical properties.
  • To explore the synthesis and characterization of novel cyclosilane copolymers.
  • To provide structure-based insights for designing silicon-based polymeric materials.

Main Methods:

  • Synthesis and characterization of 1,3- and 1,4-linked cyclosilane copolymers using NMR spectroscopy (¹H and ²⁹Si).
  • UV-Vis absorption spectroscopy to analyze optical properties.
  • Quantum chemical calculations on oligomeric models to understand electronic transitions.

Main Results:

  • 1,3-linked cyclosilanes exhibit a bathochromic shift (20 nm) in solution compared to 1,4-linked analogs.
  • Copolymerization of 1,3- and 1,4-cyclosilanes yields tunable absorption spectra dependent on comonomer incorporation.
  • Computational studies reveal conformation-dependent orbital symmetry changes influencing electronic transitions (HOMO-LUMO shifts).

Conclusions:

  • Silicon skeletal connectivity is a critical factor in controlling polysilane conformation and optoelectronic properties.
  • Distinct connectivity of comonomers allows for fine-tuning of absorption spectra in copolymers.
  • This work offers new strategies for the structure-based design of solution-processable silicon-based polymers.