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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.

Stereoisomerism

Stereoisomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...

Carbocations

Carbocations

Carbocations are one of the reaction intermediates formed during several nucleophilic substitutions or elimination reactions. A carbocation is an electron-deficient species with the central carbon atom having six electrons and three bonded atoms. The central carbon in a carbocation is sp2 hybridized with trigonal planar geometry. It has an empty p orbital perpendicular to the plane of the structure that can accept electrons. Thus, carbocations act as strong electrophiles and may react with any...

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...

Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions

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Arenediazonium substitution reactions occur when the diazonium group is substituted by various functional groups such as halides, hydroxyl, nitrile, etc. For instance, arenediazonium salts react with copper(I) salts of chloride, bromide, or cyanide to form corresponding aryl chlorides, bromides, and nitriles. These reactions are named Sandmeyer reactions. Although the mechanism of this reaction is complicated, as illustrated in Figure 1, they are believed to progress via an aryl copper...

Radicals: Electronic Structure and Geometry

Radicals: Electronic Structure and Geometry

This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
Accordingly, the structure of a trivalent radical lies between the geometries of carbocations and carbanions. An sp2-hybridized carbocation is trigonal planar, while an sp3-hybridized carbanion is trigonal pyramidal. Here, the difference in geometry is...

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Related Experiment Video

Updated: Jun 16, 2026

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex

Published on: July 27, 2022

Rhodium-germanium carbonyl complexes.

Richard D Adams¹, Eszter Trufan

¹Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, USA. Adams@mail.chem.sc.edu

Inorganic Chemistry

|February 13, 2010

Summary

This summary is machine-generated.

A new dirhodium compound with a Rh-Rh bond was synthesized and characterized. This compound reacts with a platinum complex to form a novel platinum-dirhodium cluster, revealing insights into metal-metal bonding.

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Published on: December 29, 2016

Area of Science:

Organometallic Chemistry
Coordination Chemistry
Inorganic Synthesis

Background:

Rhodium carbonyl complexes are foundational in organometallic chemistry.
Germanium-containing ligands offer unique steric and electronic properties.

Purpose of the Study:

To synthesize and characterize novel rhodium-germanium organometallic compounds.
To investigate the reactivity of dirhodium complexes with platinum phosphine complexes.
To elucidate the nature of metal-metal bonding in these clusters.

Main Methods:

Synthesis of rhodium carbonyl germanium complexes via reactions with lithium germanium reagents.
Characterization using Infrared (IR) spectroscopy, Nuclear Magnetic Resonance (NMR) spectroscopy, and single-crystal X-ray diffraction.
Computational analysis using Fenske-Hall molecular orbitals.

Main Results:

High-yield synthesis of Rh(CO)(4)GePh(3) (3).
Formation of a dirhodium compound, Rh(2)(CO)(6)(GePh(3))(2)(mu-GePh(2)) (4), featuring a Rh-Rh bond and a bridging germylene ligand.
Synthesis of a platinum-dirhodium cluster, PtRh(2)(CO)(6)(GePh(3))(2)(PBu(t)(3))(mu-GePh(2)) (5), by addition to the Rh-Rh bond.
Fenske-Hall molecular orbital calculations provided insights into metal-metal bonding.

Conclusions:

Novel rhodium-germanium and platinum-rhodium-germanium clusters were successfully synthesized and characterized.
The bridging germylene ligand and Rh-Rh bond in compound 4 are key structural features.
The reactivity of compound 4 with platinum complexes leads to the formation of heterometallic clusters.
Computational studies support the understanding of bonding interactions in these complex organometallic systems.