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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...
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...
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.
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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,...
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction01:22

Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction

The radical dimerization of ketones or aldehydes gives vicinal diols through a pinacol coupling reaction. However, the behavior of titanium metals used for the reaction as a source of electrons is unusual. When the reaction is carried out in the presence of titanium, diols can be isolated at low temperatures. Else titanium further reacts with diols, forming alkenes through the McMurry reaction.

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Related Experiment Video

Updated: May 28, 2026

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
09:37

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry

Published on: October 18, 2019

A four coordinate parent imide via a titanium nitridyl.

Ba L Tran1, Marlena P Washington, Danielle A Henckel

  • 1Indiana University, 800 E. Kirkwood Avenue, Bloomington, Indiana, USA.

Chemical Communications (Cambridge, England)
|October 6, 2011
PubMed
Summary

Researchers synthesized a novel four-coordinate titanium imide complex, [(nacnac)Ti=NH(Ntol(2))], through the reaction of a titanium precursor with sodium azide. This discovery advances the understanding of titanium imide chemistry.

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Area of Science:

  • Organometallic Chemistry
  • Inorganic Chemistry
  • Titanium Complexes

Background:

  • Titanium imide complexes are important intermediates in various catalytic processes.
  • The synthesis of low-coordinate titanium imides presents synthetic challenges.

Purpose of the Study:

  • To synthesize and characterize a novel four-coordinate, parent titanium imide complex.
  • To explore new synthetic routes to titanium imides.

Main Methods:

  • Reaction of a titanium precursor, d(1) [(nacnac)TiCl(Ntol(2))], with sodium azide (NaN(3)).
  • Characterization of the resulting product through chemical analysis and spectroscopic methods.

Main Results:

  • The reaction yielded sodium chloride (NaCl) and nitrogen gas (N(2)) as byproducts.
  • The formation of the first four-coordinate, parent imide complex, [(nacnac)Ti=NH(Ntol(2))].
  • The nacnac ligand used was [ArNC(CH(3))](2)CH, where Ar = 2,6-iPr(2)C(6)H(3) and tol = 4-CH(3)C(6)H(4).

Conclusions:

  • This study reports a new synthetic method for accessing four-coordinate titanium imides.
  • The synthesized complex represents a significant advancement in the field of low-coordinate titanium chemistry.