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Valence Bond Theory

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...

Valence Bond Theory

Valence Bond Theory

Overview of Valence Bond Theory

Colors and Magnetism

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.

Metal-Ligand Bonds

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...

Formation of Complex Ions

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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...

Complexation Equilibria: The Chelate Effect

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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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TD-DFT Guided Advanced E-Eye Sensing Technique for On-site Quantification of Fe, Cr, F, and As in the Environmental, Biological, and Food Samples

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Mixed-valence dinitrogen-bridged Fe(0)/Fe(II) complex.

Leslie D Field¹, Ruth W Guest, Peter Turner

¹School of Chemistry, The University of New South Wales, NSW 2052, Australia. l.field@unsw.edu.au

Inorganic Chemistry

|September 7, 2010

Summary

This summary is machine-generated.

This study investigates iron-dinitrogen complexes, revealing their deprotonation pathways and unusual NMR coupling. The findings enhance understanding of nitrogen ligand behavior in iron chemistry.

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Area of Science:

Organometallic Chemistry
Inorganic Chemistry
Coordination Chemistry

Background:

Dinitrogen-bridged iron complexes are key intermediates in nitrogen fixation research.
Understanding the reactivity and electronic properties of these complexes is crucial for catalyst development.

Purpose of the Study:

To investigate the base-induced reactions of a dinitrogen-bridged Fe(II)/Fe(II) complex.
To characterize the resulting iron complexes and elucidate their structural and electronic properties.

Main Methods:

Utilized (15)N labeling techniques for enhanced characterization.
Employed multinuclear NMR spectroscopy (including (31)P NMR) for structural analysis.
Performed X-ray crystallography on key intermediates.

Main Results:

Identified sequential deprotonation of the Fe(II)/Fe(II) complex to Fe(II)/Fe(0) and Fe(0)/Fe(0) species.
Observed unusual long-range (31)P-(31)P NMR coupling through the bridging dinitrogen ligand.
Characterized dinitrogen-bridged complexes (3, 4, 5) and a known Fe(0) complex (6).

Conclusions:

The study elucidates the reactivity of dinitrogen-bridged iron complexes with bases.
Unusual NMR coupling provides insights into electronic communication through bridging dinitrogen ligands.
Characterization of these complexes advances the understanding of iron-nitrogen interactions.