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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...
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The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
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2,2'-Bi(9,9-di-ethyl-fluorene).

Ki-Min Park1, Hankook Oh2, Youngjin Kang2

  • 1Research Institute of Natural Sciences, Gyeongsang National University, Jinju 660-701, Republic of Korea.

Acta Crystallographica. Section E, Structure Reports Online
|April 26, 2014
PubMed
Summary
This summary is machine-generated.

Crystallographic analysis of 9,9,9

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Area of Science:

  • Organic Chemistry
  • Crystallography
  • Materials Science

Background:

  • The study focuses on the crystal structure of 9,9,9',9'-tetra-ethyl-2,2'-bi(9H-fluorene), a complex organic molecule.
  • Understanding molecular conformation and intermolecular interactions is crucial for designing novel materials.

Purpose of the Study:

  • To elucidate the crystal structure and molecular arrangement of 9,9,9',9'-tetra-ethyl-2,2'-bi(9H-fluorene).
  • To investigate the influence of ethyl chain orientation on molecular packing and potential intermolecular interactions.

Main Methods:

  • Single-crystal X-ray diffraction was employed to determine the crystal structure.
  • Analysis of molecular geometry, including dihedral angles and bond orientations, was performed.

Main Results:

  • Two independent molecules (A and B) were identified in the asymmetric unit, differing in ethyl chain orientation.
  • Dihedral angles between fluorene moieties were 31.37(4)° (A) and 43.18(3)° (B), indicating a slight tilt.
  • Ethyl chains exhibited near-planar conformations, almost perpendicular to the fluorene systems.

Conclusions:

  • The observed molecular conformations and packing are influenced by the orientation of lateral ethyl chains.
  • Potential inter-molecular C-H⋯π interactions may contribute to the observed crystal packing.
  • The structural data provides insights into the solid-state behavior of tetra-ethyl-bi(fluorene) derivatives.