Transition metals form catalytic complexes that can speed up various chemical processes, especially in the production of pharmaceuticals as well as various pigments, dyes, and laboratory reagents like sulfuric acid. The use ...
Analytical Chemistry
Sep 19, 2023
0
75
Scripps Research chemists have extended a powerful molecule-building method—called C-H activation—to the broad class of chemicals known as alcohols.
Biochemistry
Sep 6, 2023
0
130
Aqueous rechargeable zinc ion batteries are promising components for electric grid storage due to their low cost and intrinsic safety. However, their practical implementation is hindered by poor reversibility of the zinc ...
Nanomaterials
Aug 31, 2023
0
32
Scientists from the University of Ottawa have invented a unique method to create better molecule-based magnets, known as single-molecule magnets (SMMs). This synthetic tour de force has resulted in a two-coordinate lanthanide ...
Analytical Chemistry
Jun 21, 2023
0
82
Silver nanocluster synthesis, or the binding of a silver atom to negatively charged anions, is often plagued by stability, sizing uniformity and surface composition issues. Protective molecules that bind the surface of silver ...
Nanomaterials
Jun 20, 2023
0
2
A research group led by Professor Hideki Fujiwara and Associate Professor Daisuke Sakamaki from the Graduate School of Science at Osaka Metropolitan University succeeded, for the first time, in synthesizing a new molecule ...
Analytical Chemistry
Jun 13, 2023
0
28
When designing optoelectronic devices, such as solar cells, photocatalysts, and photodetectors, scientists usually prioritize materials that are stable and possess tunable properties. This allows them precise control over ...
Nanomaterials
May 24, 2023
0
79
Small amounts of nanometer-thin metal-organic layers efficiently protect red blood cells during freezing and thawing, as a team of researchers writing in the journal Angewandte Chemie International Edition has discovered. ...
Bio & Medicine
Apr 27, 2023
0
80
The lanthanide metals are unique resources with applications ranging from magnets and catalysts to cancer treatments. Their future availability hangs on the creation of better strategies to separate lanthanide groups into ...
Analytical Chemistry
Apr 13, 2023
0
3
An ancient biological enzyme known as nickel-iron hydrogenase may play a key role in producing hydrogen for a renewables-based energy economy, researchers have found. Careful study of the enzyme has led chemists from the ...
Materials Science
Mar 29, 2023
0
104
In coordination chemistry, a ligand is an ion or molecule (see also: functional group) that binds to a central metal atom to form a coordination complex. The bonding between metal and ligand generally involves formal donation of one or more of the ligand's electron pairs. The nature of metal-ligand bonding can range from covalent to ionic. Furthermore, the metal-ligand bond order can range from one to three. Ligands are viewed as Lewis bases, although rare cases are known involving Lewis acidic "ligands."
Metal and metalloids are bound to ligands in virtually all circumstances, although gaseous "naked" metal ions can be generated in high vacuum. Ligands in a complex dictate the reactivity of the central atom, including ligand substitution rates, the reactivity of the ligands themselves, and redox. Ligand selection is a critical consideration in many practical areas, including bioinorganic and medicinal chemistry, homogeneous catalysis, and environmental chemistry.
Ligands are classified in many ways: their charge, their size (bulk), the identity of the coordinating atom(s), and the number of electrons donated to the metal (denticity or hapticity). The size of a ligand is indicated by its cone angle.
This text uses material from Wikipedia, licensed under CC BY-SA
