Related topics: cells · organic molecules

Scientists construct M29 cluster model catalyst

Recently, a group led by Prof. Li Gao from the Dalian Institute of Chemical Physics (DICP) of the Chinese Academy of Sciences, in collaboration with Prof. Wan Chongqing from Capital Normal University and Prof. Hannu Hakkinen ...

Velcro method for more precise binding of drug particles

In order to deliver drug particles to the right place in the body—a field known as nanomedicine—selectivity plays an important role. After all, the drug only has to attach itself to the cells that need it. A theory from ...

Decoding the language of cellular messaging

Before the days of rote texting and email, if you wanted to communicate with a friend you might have personalized and assembled a physical letter. Similarly, the individual cells in our bodies communicate with each other ...

Novel MOF is potential next-gen semiconductor

Metal-organic frameworks (MOFs) are emerging multi-functional materials that are gradually finding their way out of the research labs and into a myriad of real-world applications. For example, MOFs can store dangerous gasses, ...

Seeding oceans with iron may not impact climate change

Historically, the oceans have done much of the planet's heavy lifting when it comes to sequestering carbon dioxide from the atmosphere. Microscopic organisms known collectively as phytoplankton, which grow throughout the ...

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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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