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Related Concept Videos

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...
Valence Bond Theory02:45

Valence Bond Theory

Overview of Valence Bond Theory
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.
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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 with both...
Structure of Amines01:19

Structure of Amines

The hybridized nitrogen atom in amines possesses a lone pair of electrons and is bound to three substituents with a bond angle of around 108°, which is less than the tetrahedral angle of 109.5°. However, the C–N–H bond angle is slightly larger at 112°, with a carbon–nitrogen bond length of 147 pm. This carbon–nitrogen bond length of of amines is longer than the carbon–oxygen bond of alcohols (143 pm) but shorter than alkanes’ carbon–carbon bond (154 pm). These aspects are illustrated in Figure...
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...

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Related Experiment Video

Updated: Jun 3, 2026

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

Published on: May 28, 2014

Adenine coordination around a Cu6I6 core.

Rajneesh Kumar Prajapati1, Sandeep Verma

  • 1Department of Chemistry, Indian institute of Technology Kanpur, Kanpur 208016 (UP), India.

Inorganic Chemistry
|March 23, 2011
PubMed
Summary

Researchers synthesized novel copper and silver complexes using a modified adenine molecule. The study revealed a unique hexagonal prismatic cuprous iodide aggregate and interconnected metallacycles with silver.

Area of Science:

  • Coordination Chemistry
  • Supramolecular Chemistry
  • Crystallography

Background:

  • Adenine is a fundamental component of nucleic acids and plays a crucial role in biological systems.
  • Modified nucleobases offer opportunities to explore novel chemical structures and properties.
  • Metal complexes with nitrogen-containing heterocycles are of interest due to their diverse applications.

Purpose of the Study:

  • To synthesize and characterize novel copper(I) and silver(I) complexes of a modified adenine analogue.
  • To investigate the structural features of these metal complexes using crystallographic methods.
  • To explore the coordination behavior of the adenine derivative with different metal ions.

Main Methods:

  • Synthesis of a modified adenine analogue with a thiocyanate pendant arm at the N9 position.

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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex

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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

Published on: February 15, 2016

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Last Updated: Jun 3, 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

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
10:52

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex

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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
06:35

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

Published on: February 15, 2016

  • Complexation reactions with copper(I) and silver(I) salts.
  • Single-crystal X-ray diffraction analysis to determine the solid-state structures.

    • Main Results:

    • Formation of a novel hexagonal prismatic aggregate of cuprous iodide coordinated by the adenine analogue.
    • Observation of interconnected two- and four-membered metallacycles upon reaction with silver(I).
    • Detailed crystallographic data elucidating the coordination modes and supramolecular arrangements.

    Conclusions:

    • The modified adenine analogue acts as a versatile ligand, forming distinct coordination architectures with Cu(I) and Ag(I).
    • The study highlights the potential of nucleobase analogues in constructing complex metal-organic frameworks and supramolecular assemblies.
    • The findings contribute to the understanding of metal-ligand interactions involving modified nucleobases.