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Related Concept Videos

Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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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.
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...
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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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Ligand Binding and Linkage00:49

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Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked.  In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...
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Formation of Complex Ions03:45

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene
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Dinitrogen Fixation by Vanadium Complexes with a Triamidoamine Ligand.

Yoshiaki Kokubo1, Chiaki Yamamoto1, Kazuki Tsuzuki1

  • 1Department of Applied Chemistry, Faculty of Engineering , Aichi Institute of Technology , 1247 Yachigusa , Yakusa-cho, Toyota 470-0392 , Japan.

Inorganic Chemistry
|September 11, 2018
PubMed
Summary

New dinitrogen-divanadium complexes were synthesized and characterized. These complexes can convert nitrogen gas into ammonia with high yield, offering a promising pathway for nitrogen fixation.

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Area of Science:

  • Inorganic Chemistry
  • Organometallic Chemistry
  • Catalysis

Background:

  • Dinitrogen-divanadium complexes are of interest for nitrogen fixation research.
  • Understanding the structure and reactivity of these complexes is crucial for developing new catalytic systems.

Purpose of the Study:

  • To synthesize and characterize novel dinitrogen-divanadium complexes with triamidoamine ligands.
  • To investigate the structural integrity and electronic properties of these complexes in solution.
  • To explore the potential of these complexes in the reduction of dinitrogen to ammonia.

Main Methods:

  • Synthesis of dinitrogen-divanadium complexes (1-3) using triamidoamine ligands.
  • Characterization using resonance Raman, UV-vis, NMR spectroscopy, elemental analysis, and X-ray crystallography.
  • Density Functional Theory (DFT) calculations to support structural and electronic properties of complex 1.
  • Reactivity studies involving reduction with alkali metals and protonation with various acids.

Main Results:

  • X-ray crystallography confirmed a dimeric structure with a bridging μ-N2 ligand for all three complexes.
  • Spectroscopic studies (Resonance Raman, NMR) indicated structural stability in benzene and toluene solutions.
  • Complexes 1 and 3 showed characteristic 15N NMR signals for μ-N2 ligands, while complex 2 did not under identical conditions.
  • 51V NMR spectra revealed vanadium ion signals at higher magnetic fields compared to previously reported complexes.
  • All complexes successfully converted dinitrogen to ammonia in the presence of reducing agents and proton sources, without forming hydrazine.
  • Complex 1 reacted with Na[C10H8] and HOTf under N2 to yield ammonia with an impressive 151% yield (per V atom).

Conclusions:

  • Novel dinitrogen-divanadium complexes with triamidoamine ligands have been successfully synthesized and characterized.
  • These complexes exhibit structural stability in solution and unique electronic properties.
  • The complexes demonstrate significant potential for the catalytic reduction of dinitrogen to ammonia, achieving high yields.