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Related Concept Videos

Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

1.1K
Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
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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...
21.3K
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Valence Bond Theory

9.0K
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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Structural Isomerism02:34

Structural Isomerism

19.6K
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...
19.6K
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

596
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

1.1K
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...
1.1K

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Co-localizing Kelvin Probe Force Microscopy with Other Microscopies and Spectroscopies: Selected Applications in Corrosion Characterization of Alloys
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Boronated Cyanometallates.

Brendon J McNicholas1, Cherish Nie1, Anex Jose2

  • 1Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Boulevard, Pasadena, California91125, United States.

Inorganic Chemistry
|December 19, 2022
PubMed
Summary
This summary is machine-generated.

This study details novel boronated cyanometallates and metalloboratonitriles, revealing stable manganese and chromium complexes with tunable electronic properties. These findings advance the understanding of metal-cyanide-boron chemistry.

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Area of Science:

  • Coordination Chemistry
  • Organometallic Chemistry
  • Materials Science

Background:

  • Cyanometallate complexes are vital in catalysis and materials science.
  • Incorporating boron into metal-cyanide frameworks offers new electronic and structural possibilities.
  • Understanding structure-property relationships in these novel compounds is crucial for targeted applications.

Purpose of the Study:

  • To synthesize and characterize novel boronated cyanometallates and metalloboratonitriles.
  • To investigate the electronic structures and spectroscopic properties of these new compounds.
  • To explore the redox behavior and stability of the synthesized complexes.

Main Methods:

  • Synthesis and characterization using X-ray crystallography and various spectroscopic techniques (UV-vis-NIR, NMR, IR, MCD).
  • Computational analysis employing CASSCF+NEVPT2 methods for electronic structure calculations.
  • Electrochemical studies (spectroelectrochemistry) and electron paramagnetic resonance (EPR) spectroscopy.

Main Results:

  • Successfully synthesized and characterized thirteen boronated cyanometallates [M(CN-BR3)6]3/4/5- and one metalloboratonitrile [Cr(NC-BPh3)6]3-.
  • Assigned ligand-to-metal charge-transfer (LMCT) absorptions and MCD C-terms to specific electronic transitions.
  • Observed highly reversible redox couples and identified surprisingly stable Mn(I) and Cr(II) complexes with B(C6F5)3 ligands.

Conclusions:

  • The study establishes a new class of boronated cyanometallate compounds with tunable electronic properties.
  • The observed correlation between reduction potentials and LMCT energies highlights the influence of boron substituents.
  • The stability of specific manganese and chromium complexes opens avenues for further investigation in materials science.