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Related Concept Videos

Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
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Ligand Binding Sites

Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
Ligand Binding Sites02:40

Ligand Binding Sites

Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
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Coordination Number and Geometry02:57

Coordination Number and Geometry

For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
Chair Conformation of Cyclohexane02:02

Chair Conformation of Cyclohexane

The chair conformation is the most stable form of cyclohexane due to the absence of angle and torsional strain. The absence of angle strain is a result of cyclohexane’s bond angle being very close to the ideal tetrahedral bond angle of 109.5° in its chair conformer. Similarly, the torsional strain is also absent owing to the perfectly staggered arrangement of bonds.
The hydrogen atoms linked to carbons are arranged in two different axial and equatorial orientations to achieve this staggered...

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Modeling Ligands into Maps Derived from Electron Cryomicroscopy
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Modeling Ligands into Maps Derived from Electron Cryomicroscopy

Published on: July 19, 2024

Exact ligand cone angles.

Jenna A Bilbrey1, Arianna H Kazez, Jason Locklin

  • 1Department of Chemistry and Center for Computational Chemistry, University of Georgia, Athens, Georgia 30602, USA.

Journal of Computational Chemistry
|February 15, 2013
PubMed
Summary
This summary is machine-generated.

A new, rigorous method precisely calculates exact cone angles (θ°) for ligands in transition-metal complexes. This advancement overcomes limitations of older methods, improving steric bulk analysis in coordination chemistry.

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Area of Science:

  • Coordination Chemistry
  • Computational Chemistry
  • Physical Chemistry

Background:

  • Ligand steric bulk is crucial for transition-metal complex properties.
  • Existing methods like Tolman (θ) and solid (Θ) cone angles have limitations and approximations.

Purpose of the Study:

  • To introduce a mathematically rigorous method for determining exact cone angles (θ°).
  • To provide a universally applicable and precise metric for ligand steric bulk.

Main Methods:

  • Developed a novel procedure to calculate the most acute right circular cone containing any ligand.
  • Applied the method to various phosphine and amine ligands bound to Pd, Ni, and Pt using B3LYP/6-31G* DFT.
  • Analyzed structures from quantum chemical computations and X-ray crystallography.

Main Results:

  • The new exact cone angle (θ°) method is applicable to diverse ligand types and metal centers.
  • Evaluated exact cone angles for numerous ligands, revealing significant deviations from traditional θ and Θ parameters.
  • Found mean absolute deviations of 15-25° between standard and exact cone angles due to idealized structure assumptions.

Conclusions:

  • The exact cone angle (θ°) offers a more accurate quantification of ligand steric bulk.
  • This rigorous approach enhances the understanding of structure-property relationships in transition-metal chemistry.
  • The method provides a superior tool for analyzing ligand effects in catalysis and materials science.