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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...
Colors and Magnetism03:02

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
Structural Isomerism02:34

Structural Isomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
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...
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.

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Related Experiment Video

Updated: Jun 27, 2026

Synthesis of In37P20(O2CR)51 Clusters and Their Conversion to InP Quantum Dots
08:21

Synthesis of In37P20(O2CR)51 Clusters and Their Conversion to InP Quantum Dots

Published on: May 7, 2019

Solid-state (115)In NMR study of indium coordination complexes.

Fu Chen1, Guibin Ma, Ronald G Cavell

  • 1Department of Chemistry, University of Alberta, Edmonton, Alberta, CanadaT6G 2G2.

Chemical Communications (Cambridge, England)
|November 26, 2008
PubMed
Summary

Solid-state indium-115 NMR studies are feasible for characterizing indium compounds. This research demonstrates NMR

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Area of Science:

  • Solid-state inorganic chemistry
  • Nuclear Magnetic Resonance spectroscopy

Background:

  • Indium compounds require advanced characterization techniques.
  • Solid-state NMR spectroscopy offers unique insights into nuclear properties.

Purpose of the Study:

  • To demonstrate the feasibility of solid-state (115)In NMR spectroscopy.
  • To characterize electric field gradients and magnetic shielding in indium complexes.

Main Methods:

  • Solid-state (115)In NMR experiments were performed on four distinct indium(III) coordination complexes.
  • Nuclear quadrupolar and chemical shift parameters were analyzed.

Main Results:

  • The study successfully obtained (115)In NMR data, providing information on electric field gradients and magnetic shielding.
  • Quadrupolar coupling (C(Q)) values ranged from 106.0 +/- 2.0 to 200.0 +/- 4.0 MHz.
  • Magnetic shielding anisotropies varied from 85 +/- 15 to 550 +/- 60 ppm.

Conclusions:

  • Solid-state (115)In NMR is a viable technique for indium compound characterization.
  • High magnetic field strengths enhance the utility of these NMR studies.
  • NMR spectroscopy is a promising tool for analyzing indium-containing materials.