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Related Concept Videos

Valence Bond Theory02:42

Valence Bond Theory

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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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Hybridization of Atomic Orbitals II03:35

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sp3d and sp3d 2 Hybridization
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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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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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Stereoisomerism02:52

Stereoisomerism

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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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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Updated: Feb 25, 2026

Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents
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Triplet state CPL active helicene-dithiolene platinum bipyridine complexes.

Thomas Biet1, Thomas Cauchy1, Qinchao Sun2

  • 1Laboratoire Moltech-Anjou, Université d'Angers, CNRS UMR 6200, 2 bd Lavoisier, 49045 Angers, France. narcis.avarvari@univ-angers.fr.

Chemical Communications (Cambridge, England)
|August 3, 2017
PubMed
Summary

Researchers synthesized novel chiral platinum complexes with helicene ligands, creating luminescent materials. Enantiopure versions exhibit room-temperature circularly polarized luminescence, opening doors for chiral optoelectronic applications.

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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Photophysics

Background:

  • Chiral metal dithiolene complexes are valuable precursors for advanced molecular materials.
  • Chirality in these materials influences conductivity, magnetism, and photophysical properties.

Purpose of the Study:

  • To synthesize and characterize the first chiral metal diimine dithiolene complexes.
  • To investigate the photophysical properties and solid-state structures of these novel platinum complexes.

Main Methods:

  • Synthesis of racemic and enantiopure platinum(II) complexes featuring 2,2'-bipyridine and helicene-dithiolene ligands.
  • Solid-state structure determination.
  • UV-vis absorption spectroscopy and time-dependent density-functional theory (TD-DFT) calculations.
  • Circularly polarized luminescence (CPL) measurements.

Main Results:

  • Successful synthesis of luminescent platinum(II) complexes with [4] and [6]helicene-dithiolene ligands.
  • TD-DFT calculations confirmed the origin of absorption bands as mixed metal-ligand-to-ligand charge transfer and emission from the T1 excited state.
  • Enantiopure [6]helicene complexes demonstrated CPL activity at room temperature in solution.

Conclusions:

  • These novel chiral platinum complexes are promising building blocks for chiral molecular materials.
  • The observed CPL activity highlights their potential in chiroptical applications.
  • The study provides a foundation for designing new chiral functional materials based on metal dithiolene complexes.