- Π backbonding
π backbonding, also called π backdonation, is a concept from
chemistry, in which electrons move from an atomic orbitalon one atom to a π* anti-bonding orbital on another atom or ligand. It is especially common in the organometallic chemistryof transition metals with multi-atomic ligands such as carbon monoxide, ethyleneor the nitrosoniumcation. Electrons from the metal are used to bond to the ligand, in the process relieving the metal of excess negative charge.
The electrons are taken from a d-orbital of the metal, and usually placed into an anti-bonding molecular orbital of the ligand, which causes the
bond orderof that ligand to decrease. This leads to a decrease in the vibrational frequency of the bond, which can be measured using IR spectroscopy. Although the bond-order within the ligand is decreased by this process, the metal - ligand bond-order is increased.
Compounds where π backbonding occurs include Ni(CO)4 and
ligand field theory
Wikimedia Foundation. 2010.
Look at other dictionaries:
backbonding ligand — noun A ligand that has two or more bonds to the same metal centre … Wiktionary
Metal L-edge — Figure 1: L3 and L2 edges of [CuCl4]2 … Wikipedia
Palladium(II) acetate — Chembox new Name = Palladium(II) acetate ImageFile = Palladium(II) acetate.jpg ImageName = Palladium(II) acetate IUPACName = Palladium(II) acetate OtherNames = Palladium diacetate hexakis(acetato)tripalladium bis(acetato)palladium Section1 =… … Wikipedia
Metallocene — General chemical structure of a Metallocene compound, where M is a metal cation A metallocene is a compound typically consisting of two cyclopentadienyl anions (Cp, which is C5H5 ) bound to a metal center (M) in the oxidation state II, with the… … Wikipedia
Organometallic chemistry — n Butyllithium, an organometallic compound. Four lithium atoms are shown in purple in a tetrahedron, and each lithium atom is bound to a butyl group (carbon is black, hydrogen is white). Organometallic chemistry is the study of chemical compounds … Wikipedia
Ziegler-Natta catalyst — A Ziegler Natta catalyst is a reagent or a mixture of reagents used in the production of polymers of 1 alkenes (α olefins). Ziegler Natta catalysts are typically based on titanium compounds and organometallic aluminium compounds, for example… … Wikipedia
Gilman reagent — General structure of a Gilman reagent A Gilman reagent is a lithium and copper (diorganocopper) reagent compound, R2CuLi, where R is an organic radical. These are useful because they react with organic chlorides, bromides, and iodides to replace… … Wikipedia
Henry Taube — Infobox Scientist name = Henry Taube birth date = birth date|1915|11|30 birth place = Neudorf, Saskatchewan, Canada residence = Canada, Naturalized Citizen of the United States nationality = Canada death date = death date|2005|11|16 death place… … Wikipedia
Cyclopentadienyl complex — Zirconocene dichloride, a cyclopentadienyl complex A cyclopentadienyl complex is a metal complex with one or more cyclopentadienyl groups (C5H5−, abbreviated as Cp−). Based on the type of bonding between the metals and the cyclopentadienyl]]… … Wikipedia
Ligand field theory — (LFT) describes the bonding in coordination complexes. [Schläfer, H. L.; Gliemann, G. Basic Principles of Ligand Field Theory Wiley Interscience: New York; 1969] It represents an application of molecular orbital theory to transition metal… … Wikipedia