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Related Concept Videos

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.
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Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
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Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Related Experiment Video

Updated: Apr 16, 2026

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of PhosphorusI
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Bis(triphenylphosphine)silver(i) perrhenate, a cyclic dimer.

F Deiser1, F Kraus, H Schmidbaur

  • 1Department Chemie, Technische Universität München, Lichtenbergstrasse 4, 85747 Garching b. M., Germany. h.schmidbaur@lrz.tum.de florian.kraus@chemie.uni-marburg.de.

Chemical Communications (Cambridge, England)
|March 20, 2015
PubMed
Summary

Researchers synthesized silver perrhenate and triphenylphosphine complexes. Structural analysis revealed distinct ionic and cyclic dimer arrangements, differing from gold analogues and highlighting unique silver coordination.

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Area of Science:

  • Inorganic Chemistry
  • Coordination Chemistry
  • Solid-State Chemistry

Background:

  • Silver perrhenate and triphenylphosphine complexes are of interest due to their coordination behavior.
  • Understanding the structural diversity of metal-ligand complexes is crucial in inorganic chemistry.

Purpose of the Study:

  • To synthesize and characterize novel silver perrhenate and triphenylphosphine complexes.
  • To elucidate the solid-state structures of these complexes using X-ray diffraction.
  • To compare the structural features with analogous gold complexes.

Main Methods:

  • Synthesis of 1:4 and 1:2 complexes of silver perrhenate and triphenylphosphine.
  • Single-crystal X-ray diffraction for solid-state structure determination.

Main Results:

  • The 1:4 complex, [(Ph3P)4Ag](+) ReO4(-), exists as independent ions.
  • The 1:2 complex, [(Ph3P)2AgReO4]2, forms cyclic dimers with aggregated ions.
  • Silver centers in the 1:2 complex are tetracoordinated, interacting with bridging perrhenate anions.

Conclusions:

  • The structural characterization reveals distinct aggregation patterns for silver perrhenate and triphenylphosphine complexes.
  • The tetracoordination of silver centers in the 1:2 complex contrasts with the strictly two-coordinate gold centers in its analogue.
  • These findings contribute to understanding the coordination chemistry and structural variability of silver complexes.