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The Coordination Chemistry and Organometallic Chemistry of Tridentate Oxygen Ligands with π‐Donor Properties
Author(s) -
Kläui Wolfgang
Publication year - 1990
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.199006271
Subject(s) - chemistry , steric effects , reactivity (psychology) , ligand (biochemistry) , coordination complex , metal , coordination sphere , group 2 organometallic chemistry , organometallic chemistry , molecule , metal ions in aqueous solution , combinatorial chemistry , stereochemistry , organic chemistry , catalysis , medicine , biochemistry , alternative medicine , receptor , pathology
Metal complexes are capable of accomplishing almost anything, provided they contain the proper metal/ligand combinations. A host of essential biochemical transformations—but also a great many industrially significant reactions—occur within the coordination spheres of metal ions. For instance, the particular arrangement of ligands in the zinc‐containing enzyme carboanhydrase is responsible for an acceleration in the hydration of CO 2 by a factor of 10 9 . It is the ligands that determine whether an iron atom will transfer molecular oxygen, as in the case of hemoglobin, or electrons, as with the cytochromes. By varying the ligands it is possible to establish in advance whether a metal ion in the presence of synthesis gas will cause an olefin to be hydrogenated or hydroformylated. Stated more generally, it is the ligands that stabilize the particular oxidation states of a metal and determine how substrate molecules will be coordinated and undergo reaction. The synthesis of new ligands that confer specific reactivity on metal ions is thus an important challenge for the coordination chemist. The following article describes organometallic compounds of the type [CpCo{P(O)R′R″} 3 ] ⊖ , which have developed from an extremely unreactive laboratory curiosity into versatile oxygen‐containing ligands whose steric and electronic properties promise a series of interesting applications.