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Properties of Transition Metals

Properties of Transition Metals

Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.

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...

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...

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...

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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

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First-principles studies on graphene-supported transition metal clusters.

Sanjubala Sahoo¹, Markus E Gruner², Shiv N Khanna¹

¹Department of Physics, Virginia Commonwealth University, Richmond, Virginia 23284, USA.

The Journal of Chemical Physics

|August 24, 2014

Summary

This summary is machine-generated.

Defects in graphene substrates significantly enhance the binding of transition metal (TM) clusters, influencing their electronic and magnetic properties. Cobalt clusters (Co13) show stronger adsorption than iron (Fe13) or nickel (Ni13) clusters on defective graphene.

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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

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Published on: July 24, 2015

Area of Science:

Materials Science
Condensed Matter Physics
Computational Chemistry

Background:

Graphene's unique electronic properties make it a promising substrate for supporting transition metal clusters.
Understanding the interaction between transition metal clusters and graphene is crucial for designing novel materials and devices.
Defects in graphene can significantly alter its properties and the behavior of adsorbed species.

Purpose of the Study:

To investigate the structural, stability, and magnetic properties of icosahedral transition metal (TM13) clusters (TM = Fe, Co, Ni) on pristine and defective graphene.
To analyze the influence of different graphene defects on the adsorption and magnetic characteristics of TM13 clusters.
To compare the binding strengths and magnetic moments of Fe13, Co13, and Ni13 clusters on various graphene substrates.

Main Methods:

Gradient-corrected density functional theory (DFT) framework.
Modeling of pristine graphene sheets, graphene with carbon vacancies, and graphene flakes with five- and seven-membered rings.
Calculation of structural parameters, binding energies, electronic structures, and magnetic moments.

Main Results:

Defects in graphene substrates profoundly influence the electronic structure and magnetic properties of graphene-transition metal complexes.
Defects increase the binding strength of TM clusters on graphene substrates.
Cobalt clusters (Co13) exhibit stronger adsorption on both pristine and defective graphene compared to Fe13 and Ni13 clusters.
Adsorbed TM13 clusters display reduced magnetic moments relative to their free counterparts.

Conclusions:

Graphene defects play a critical role in modulating the properties of supported transition metal clusters.
The nature and presence of defects can be exploited to tune the interaction and magnetic behavior of TM-graphene systems.
Cobalt clusters show particular promise for strong binding on defective graphene substrates, with implications for catalysis and spintronics.