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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...

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...

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...

Structural Isomerism

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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.
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Coordination Compounds and Nomenclature

Coordination Compounds and Nomenclature

In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...

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Updated: Dec 13, 2025

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV

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Published on: December 29, 2016

Iron-Gallium and Cobalt-Gallium Tetraphosphido Complexes.

Christoph G P Ziegler¹, Felix Hennersdorf², Jan J Weigand²

¹Institute of Inorganic Chemistry University of Regensburg 93040 Regensburg Germany.

Zeitschrift Fur Anorganische Und Allgemeine Chemie

|August 4, 2020

Summary

This summary is machine-generated.

Two new heterobimetallic complexes featuring reduced phosphorus-4 (P4) units were synthesized. These complexes showcase a unique P4 chain bridging transition metals (iron or cobalt) and gallium, with potential applications in inorganic chemistry.

Keywords:

Cobalt Gallium Heterobimetalic complexes Iron Phosphorus

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Area of Science:

Inorganic Chemistry
Organometallic Chemistry
Materials Science

Background:

Heterobimetallic complexes offer unique reactivity and properties due to the presence of multiple distinct metal centers.
Reduced phosphorus allotropes, such as the P4 unit, are of significant interest for developing novel chemical structures and bonding motifs.
Gallium and transition metals can form synergistic complexes with tailored electronic and structural characteristics.

Purpose of the Study:

To synthesize and characterize novel heterobimetallic complexes incorporating a reduced phosphorus-4 (P4) unit.
To investigate the coordination behavior of the P4 unit bridging a transition metal and a gallium center.
To explore the structural and electronic properties of these unique molecular architectures.

Main Methods:

Synthesis of heterobimetallic complexes via reactions involving gallium(III) precursors and transition metal salts.
Characterization using X-ray crystallography to determine solid-state molecular structures.
Multinuclear NMR spectroscopy to assess structural integrity and bonding in solution.

Main Results:

Successful synthesis of two heterobimetallic complexes: [K([18]crown-6){(η⁴-C₁₄H₁₀)Fe(μ-η⁴:η²-P₄)Ga(nacnac)}] (1) and [K(dme)₂{(η⁴-C₁₄H₁₀)Co(μ-η⁴:η²-P₄)Ga(nacnac)}] (2).
X-ray crystallography revealed a P4 chain bridging the transition metal (Fe or Co) and the gallium atom, with the P4 unit coordinated through all four phosphorus atoms to the transition metal and via terminal atoms to gallium.
NMR studies confirmed the structural stability of complex 2 in solution.

Conclusions:

The study demonstrates the successful incorporation of a strongly reduced P4 unit into heterobimetallic frameworks.
The P4 chain acts as a versatile bridging ligand, coordinating to both transition metals and gallium.
These findings open avenues for exploring novel phosphorus-based inorganic materials and catalysts.