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Valence Bond Theory02:42

Valence Bond Theory

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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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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Updated: Jun 1, 2026

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: May 28, 2014

Dibromidodimethyl-dipyridine-platinum(IV).

Mairéad E Kelly1, Christoph Wagner, Harry Schmidt

  • 1Institut für Chemie, Kurt-Mothes-Straße 2, Martin-Luther-Universität Halle-Wittenberg, 06120 Halle, Germany.

Acta Crystallographica. Section E, Structure Reports Online
|May 18, 2011
PubMed
Summary

This study details the crystal structure of a platinum(IV) complex, [PtBr(2)(CH(3))(2)(C(5)H(5)N)(2)], revealing its distorted octahedral geometry. Weak intramolecular hydrogen bonds were observed within the complex.

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Published on: November 22, 2016

Area of Science:

  • Inorganic Chemistry
  • Crystallography
  • Coordination Chemistry

Background:

  • Platinum(IV) complexes are of interest due to their diverse applications.
  • Understanding the structural properties of platinum complexes is crucial for predicting their behavior.

Purpose of the Study:

  • To elucidate the detailed crystal structure of the novel platinum(IV) complex [PtBr(2)(CH(3))(2)(C(5)H(5)N)(2)].
  • To investigate the coordination geometry and intermolecular interactions within the complex.

Main Methods:

  • Single-crystal X-ray diffraction analysis was employed to determine the molecular structure.
  • The crystallographic data was analyzed to identify bond lengths, angles, and non-covalent interactions.

Main Results:

  • The platinum(IV) center adopts a slightly distorted octahedral coordination geometry.
  • The complex crystallizes with the platinum(IV) metal center lying on a twofold rotation axis.
  • Weak intramolecular C-H⋯Br hydrogen bonding interactions were identified.

Conclusions:

  • The structural characterization provides fundamental insights into the solid-state arrangement of this platinum(IV) complex.
  • The presence of hydrogen bonding may influence the packing and stability of the crystal structure.