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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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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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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.
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Isomerism in Complexes
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Tetrahedral Complexes
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Bridging Titanium Nitrido Complexes Containing A Linear Ti-N-Ti Core with A Two-Coordinate Nitrido Ligand.

Akira Okumura1, Priyabrata Ghana1,2, Thomas P Spaniol1

  • 1Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|July 24, 2024
PubMed
Summary

This study reports novel dinuclear titanium nitrido complexes using the Xy-N3N ligand. Structures varied with alkali metals, showing linear or T-shaped cores, and decomposition pathways were observed.

Keywords:
Alkali metalAzido ligandBridging nitrido ligandTREN ligandTitanium

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Area of Science:

  • Inorganic Chemistry
  • Organometallic Chemistry
  • Materials Science

Background:

  • Titanium nitrido complexes are of interest due to their unique electronic properties and potential applications.
  • The triamidoamine ligand (Xy-N3N) provides a robust coordination environment for metal centers.
  • Understanding the structural diversity and reactivity of these complexes is crucial for developing new materials.

Purpose of the Study:

  • To synthesize and characterize a series of dinuclear titanium μ2-nitrido complexes supported by the Xy-N3N ligand.
  • To investigate the influence of alkali metal counterions on the solid-state structures of these complexes.
  • To explore the reactivity and decomposition pathways of titanium nitrido complexes under reductive conditions.

Main Methods:

  • Synthesis of titanium azido and chloride precursors via salt metathesis.
  • Formation of dinuclear titanium nitrido complexes through reactions with alkali metals or alkali metal naphthalenides.
  • Structural characterization using single-crystal X-ray diffraction and multinuclear NMR spectroscopy.

Main Results:

  • Successfully synthesized dinuclear titanium μ2-nitrido complexes (2-M) with various alkali metals (Li, Na, K, Rb).
  • Observed alkali metal-dependent structural variations, including linear Ti-N-Ti cores (2-Li, 2-K) and a μ3-nitrido ligand with a T-shaped Ti2NaN fragment (2-Na).
  • Identified decomposition pathways leading to intractable titanium species and trialkali metal salts (3-M) under strongly reductive conditions.

Conclusions:

  • The Xy-N3N ligand effectively stabilizes dinuclear titanium nitrido complexes.
  • Alkali metal ions play a critical role in dictating the solid-state structures of these nitrido complexes.
  • The study provides insights into the reactivity and decomposition mechanisms of titanium nitrido species.