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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.

Crystal Field Theory - Octahedral Complexes

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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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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than...

Chirality

Chirality

Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...

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Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...

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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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

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Nonhanded chirality in octahedral metal complexes.

¹Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA. rbking@sunchem.chem.uga.edu

|July 24, 2001

Summary

This summary is machine-generated.

Chiral metal complexes can be handed or nonhanded. The symmetry of ligand arrangements determines whether a chiral complex remains chiral or can interconvert between enantiomers without an achiral intermediate.

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Area of Science:

Coordination Chemistry
Stereochemistry
Computational Chemistry

Background:

Chirality is a fundamental property of molecules, distinguishing between handed (enantiomeric) and nonhanded forms.
Metal complexes exhibit chirality based on ligand arrangement, with tetrahedral and octahedral geometries being common examples.
Understanding the relationship between ligand symmetry and complex chirality is crucial for predicting molecular properties.

Purpose of the Study:

To investigate the relationship between ligand partition symmetry and the chirality of metal complexes.
To determine the conditions under which chiral metal complexes are definitively handed or can interconvert between enantiomers.
To analyze the chirality polynomials for tetrahedral and octahedral metal complexes.

Main Methods:

Analysis of ligand partitions for tetrahedral and octahedral metal complexes.
Determination of lowest-degree chirality polynomials for various ligand arrangements.
Classification of chiral metal complexes as handed or nonhanded based on symmetry.

Main Results:

The fully unsymmetrical degree 6 partition (1(4)) is the only chiral ligand partition for tetrahedral metal complexes, leading to handed complexes (e.g., MABCD).
Lowest-degree chiral ligand partitions for octahedral complexes are degree 6 partitions (31(3)) and (2(3)), yielding handed complexes (fac-MA(3)BCD and cis-MA(2)B(2)C(2)).
Less symmetrical octahedral ligand partitions ((2(2)1(2)), (21(4)), (1(6))) result in nonhanded chiral complexes where enantiomers interconvert without an achiral intermediate.

Conclusions:

The symmetry of ligand arrangement dictates whether a chiral metal complex is inherently handed or can undergo enantiomeric interconversion.
Specific ligand partitions for tetrahedral and octahedral geometries lead to definitively handed chiral complexes.
Less symmetrical ligand arrangements in octahedral complexes result in nonhanded chirality, allowing for facile enantiomer interconversion.