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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 eye.

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...

Formation of Complex Ions

Formation of Complex Ions

A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...

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...

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Iridium(III) Luminescent Probe for Detection of the Malarial Protein Biomarker Histidine Rich Protein-II

Iridium(III) Luminescent Probe for Detection of the Malarial Protein Biomarker Histidine Rich Protein-II

Published on: July 7, 2015

Panchromic cationic iridium(III) complexes.

Kamrul Hasan¹, Eli Zysman-Colman

¹Département de Chimie, Université de Sherbrooke , 2500 Boul de l'Université, Sherbrooke, Quebec, Canada J1K 2R1.

Inorganic Chemistry

|November 9, 2012

Summary

This summary is machine-generated.

Researchers synthesized novel iridium complexes with unique ligands. These complexes show broad light absorption, indicating potential for efficient solar energy harvesting applications.

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Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene

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Area of Science:

Organometallic Chemistry
Materials Science
Photophysics

Background:

Iridium complexes are widely studied for their photophysical properties.
Developing new materials for solar energy harvesting is crucial for renewable energy solutions.
Bis[(4-methoxyphenyl)imino]acenaphthene ligands offer tunable electronic properties.

Purpose of the Study:

To synthesize and characterize novel cationic iridium complexes.
To investigate the optoelectronic properties of these complexes.
To evaluate their potential for solar-energy-harvesting applications.

Main Methods:

Synthesis of two cationic iridium complexes.
X-ray crystallography for structural determination.
Spectroscopic and electrochemical characterization for optoelectronic properties.

Main Results:

Successful synthesis and structural elucidation of the target iridium complexes.
Observation of panchromic absorption extending up to 800 nm.
Demonstration of promising optoelectronic characteristics.

Conclusions:

The synthesized iridium complexes possess broad light absorption capabilities.
These complexes are suitable candidates for further investigation in solar energy conversion.
The ligand design effectively influences the optoelectronic properties.