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Chemists create framework for the oxidation of hydrocarbons

RUDN University chemists have created new copper-containing metallasilsesquioxane frameworks. Some of them have proven to be effective catalysts for the oxidation of hydrocarbons. The results are published in Molecules.

Scientists unlock nature's secret to super-selective binding

EPFL researchers have discovered that it is not just molecular density, but also pattern and structural rigidity, that control super-selective binding interactions between nanomaterials and protein surfaces. The breakthrough ...

Antibiotics boosted with new targeted delivery system

Hung-Jen Wu, associate professor in the Artie McFerrin Department of Chemical Engineering at Texas A&M University, is working to defeat bacteria that have become resistant to multiple types of antibiotics. To achieve interdisciplinary ...

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Ligand

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.

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