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Valence Bond Theory02:42

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
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Conducting neutral gold bisdithiolene complex [Au(dspdt)2]˙.

Mariana F G Velho1, Rafaela A L Silva2, Graça Brotas2

  • 1Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico, Universidade de Lisboa, E.N. 10, P-2695-066 Bobadela LRS, Portugal. dbelo@ctn.tecnico.ulisboa.pt malmeida@ctn.tecnico.ulisboa.pt and Instituto de Telecomunicações, Instituto Superior Técnico, Av. Rovisco Pais 1, P-1049-001, Lisboa, Portugal.

Dalton Transactions (Cambridge, England : 2003)
|September 30, 2020
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Summary

Researchers synthesized a neutral gold bisdithiolene complex, [Au(dspdt)2], featuring interacting dimer and trimer chains. This unique structure results in relatively high electrical conductivity at room temperature.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Solid-State Chemistry

Background:

  • Gold complexes with dithiolene ligands are known for their interesting electronic properties.
  • Previous research has focused on charged dithiolene complexes, with neutral variants being less explored.

Purpose of the Study:

  • To synthesize and characterize a novel neutral gold bisdithiolene complex.
  • To investigate the structural and electrical properties of the new complex, [Au(dspdt)2].
  • To explore the potential of neutral gold dithiolenes in conductive materials.

Main Methods:

  • Synthesis of the neutral gold bisdithiolene complex, [Au(dspdt)2].
  • Single-crystal X-ray diffraction for structural analysis.
  • Electrical conductivity measurements using a four-probe method.

Main Results:

  • The complex [Au(dspdt)2] was successfully synthesized and characterized.
  • A unique crystal structure featuring interacting dimer and trimer chains was observed.
  • Relatively high electrical conductivity of 0.1 S cm-1 was measured at room temperature.

Conclusions:

  • [Au(dspdt)2] represents a new class of neutral gold bisdithiolene complexes.
  • The observed chain structures are crucial for the material's electrical conductivity.
  • This discovery opens avenues for developing new conductive materials based on neutral gold dithiolenes.