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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...

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...

Coordination Number and Geometry

Coordination Number and Geometry

For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.

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.

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Preparation of SNS CobaltII Pincer Model Complexes of Liver Alcohol Dehydrogenase

Preparation of SNS CobaltII Pincer Model Complexes of Liver Alcohol Dehydrogenase

Published on: March 19, 2020

Nonlinear d(10)-ML2 Transition-Metal Complexes.

Lando P Wolters¹, F Matthias Bickelhaupt²

¹Department of Theoretical Chemistry and Amsterdam Center for Multiscale Modeling, VU University De Boelelaan 1083, 1081 HV Amsterdam (The Netherlands).

|February 20, 2014

Summary

This summary is machine-generated.

Dicoordinated d(10)-transition-metal complexes (ML2) can exhibit bent molecular geometries, deviating from linearity. This bending is primarily driven by π backdonation, which stabilizes the complexes by enhancing orbital overlap.

Keywords:

bond theory density functional calculations energy decomposition analysis molecular geometry transition-metal complexes π backdonation

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A Technical Guide for Performing Spectroscopic Measurements on Metal-Organic Frameworks

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A Technical Guide for Performing Spectroscopic Measurements on Metal-Organic Frameworks

A Technical Guide for Performing Spectroscopic Measurements on Metal-Organic Frameworks

Published on: April 28, 2023

Area of Science:

Inorganic Chemistry
Computational Chemistry
Quantum Chemistry

Background:

Dicoordinated d(10)-transition-metal complexes (ML2) are known, but their structural diversity, particularly deviations from linearity, requires further explanation.
The influence of metal identity and ligand type on molecular geometry in these systems is not fully understood.

Purpose of the Study:

To investigate the molecular geometries of various d(10)-transition-metal complexes (ML2).
To provide a detailed explanation for the observed bent ligand-metal-ligand (L-M-L) angles in these complexes.
To elucidate the role of electronic factors, specifically π backdonation, in determining molecular structure.

Main Methods:

Relativistic density functional theory (DFT) calculations using the ZORA-BLYP/TZ2P level of theory.
Analysis of bonding mechanisms using quantitative Kohn-Sham molecular orbital (MO) theory.
Application of an energy decomposition analysis (EDA) scheme to quantify bonding interactions.

Main Results:

Observed L-M-L angles ranging from 180° to 128.6°, varying with metal and ligand choice.
Identified π backdonation as the primary driving force behind bent L-M-L structures.
Demonstrated that increased π backdonation leads to stabilization through enhanced orbital overlap.

Conclusions:

Bent geometries in ML2 complexes arise from a balance between stabilization via π backdonation and steric repulsion.
The extent of π backdonation is tunable by the choice of metal and ligands, influencing the L-M-L angle.
Computational methods provide valuable insights into the electronic structure and bonding governing molecular geometries.