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• Tolman_electronic_parameter abstract "The Tolman electronic parameter (TEP), named after Chadwick A. Tolman, is a measure of the electron donating or withdrawing ability of a ligand. It is determined by measuring the frequency of the A1 C-O vibrational mode of a complex, LNi(CO)3 by infrared spectroscopy, where L is the ligand being studied. LNi(CO)3 was chosen as the model compound because such complexes are readily prepared from tetracarbonylnickel(0). The carbonyl band is quite distinctive, and is rarely obscured by other bands in the analyte's infrared spectrum. Carbonyl is a small ligand so steric factors do not complicate the analysis.Upon coordination to a metal, ν(CO) typically decreases from 2143 cm−1 of free CO. This can be explained by π backbonding: the metal is able to form a π bond with the carbonyl ligand by donating electrons through its d orbitals into the empty π* anti-bonding orbitals on CO. This strengthens the metal-carbon bond, but also weakens the carbon-oxygen bond. If other ligands increase the density of π electrons on the metal, the C-O bond is weakened and ν(CO) decreases; conversely, if other ligands compete with CO for π backbonding, ν(CO) increases.The Tolman cone angle and TEP has been used to characterize the steric and electronic properties of phosphines, which are popular ligands for catalysts.".
• Tolman_electronic_parameter thumbnail A1_stretch_of_Ni(CO)3L.png?width=300.
• Tolman_electronic_parameter wikiPageID "31252651".
• Tolman_electronic_parameter wikiPageRevisionID "425458277".
• Tolman_electronic_parameter hasPhotoCollection Tolman_electronic_parameter.
• Tolman_electronic_parameter subject Category:Infrared_spectroscopy.
• Tolman_electronic_parameter subject Category:Inorganic_chemistry.
• Tolman_electronic_parameter subject Category:Organometallic_chemistry.
• Tolman_electronic_parameter comment "The Tolman electronic parameter (TEP), named after Chadwick A. Tolman, is a measure of the electron donating or withdrawing ability of a ligand. It is determined by measuring the frequency of the A1 C-O vibrational mode of a complex, LNi(CO)3 by infrared spectroscopy, where L is the ligand being studied.".
• Tolman_electronic_parameter label "Tolman electronic parameter".
• Tolman_electronic_parameter sameAs m.0gj8gj5.
• Tolman_electronic_parameter sameAs Q17087109.
• Tolman_electronic_parameter sameAs Q17087109.
• Tolman_electronic_parameter wasDerivedFrom Tolman_electronic_parameter?oldid=425458277.
• Tolman_electronic_parameter depiction A1_stretch_of_Ni(CO)3L.png.
• Tolman_electronic_parameter isPrimaryTopicOf Tolman_electronic_parameter.