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Related Concept Videos

Structure of Conjugated Dienes01:16

Structure of Conjugated Dienes

Introduction
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

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.
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
Structural Isomerism02:34

Structural Isomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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: Jul 14, 2026

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
10:51

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes

Published on: April 10, 2015

Wirelike dinuclear ruthenium complexes connected by bis(ethynyl)oligothiophene.

Li-Bin Gao1, Jian Kan, Yang Fan

  • 1State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, The Chinese Academy of Sciences, Fuzhou, Fujian 350002, China.

Inorganic Chemistry
|May 22, 2007
PubMed
Summary

Researchers synthesized binuclear ruthenium polyynediyl complexes, creating molecular wires. Thiophene spacers enhance metal-metal charge transfer, showing electronic communication depends on molecular structure and end groups.

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Reductive Electropolymerization of a Vinyl-containing Poly-pyridyl Complex on Glassy Carbon and Fluorine-doped Tin Oxide Electrodes
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Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents
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Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents

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Published on: April 10, 2015

Reductive Electropolymerization of a Vinyl-containing Poly-pyridyl Complex on Glassy Carbon and Fluorine-doped Tin Oxide Electrodes
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Reductive Electropolymerization of a Vinyl-containing Poly-pyridyl Complex on Glassy Carbon and Fluorine-doped Tin Oxide Electrodes

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Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents
07:20

Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents

Published on: May 28, 2014

Area of Science:

  • Organometallic Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Binuclear ruthenium polyynediyl complexes serve as molecular wires.
  • Redox-active organometallic fragments like [(bph)(PPh3)2Ru]+ and [(Phtpy)(PPh3)2Ru]2+ cap these structures.
  • Molecular rod length is tunable via thiophene or phenylene spacers.

Purpose of the Study:

  • To synthesize and characterize novel binuclear ruthenium polyynediyl complexes.
  • To investigate the effect of bridging ligands (thiophene vs. phenylene) on electronic communication.
  • To explore how ancillary ligands influence intermetallic electronic communication.

Main Methods:

  • Synthesis of rodlike binuclear ruthenium polyynediyl complexes.
  • Characterization using electrochemical and UV-vis-NIR spectroscopy.
  • Oxidation studies to form stable mixed-valence and fully oxidized species.

Main Results:

  • Thiophene-containing bridges facilitate superior metal-metal charge transfer compared to phenylene bridges.
  • Increasing thiophene spacers in mixed-valence complexes shifts electronic character from delocalization to localization.
  • Electronic communication capability follows a specific order: {Ru}-CC(CC)2CC-{Ru} > {Ru}-CC(C4H2S)CC-{Ru} > {Ru}-CC(C6H4)CC-{Ru} > {Ru}-CC(CH=CH)2CC-{Ru}.
  • Electron-rich endgroups enhance electronic communication compared to electron-deficient ones.

Conclusions:

  • The electronic communication in these molecular wires is significantly influenced by the nature of the bridging spacers and the ancillary ligands.
  • Thiophene units are effective in promoting charge transfer, while the degree of electronic delocalization can be tuned by the number of thiophene spacers.
  • Molecular wire design offers a pathway to fine-tune electronic properties for potential applications.