Coordination chemistry salen

The ability of the ubiquitous Co(salen) complex and its tetradentate Schiff base analog complexes to bind 02 reversibly has been central to most investigations of its coordination chemistry. A density functional computational investigation has been carried out on the 02 carriers... 

Gas-Phase Coordination Chemistry of Manganese(lll)-Salen Complexes... 

One of the classical tetradentate Schiff bases is the open-chain N2O2 donor ligand salen (137), which has flexibihty sufficient to permit it to form different geometric isomers on complexation. The ability of the ubiquitous salen and close analogues to bind O2 reversibly as its cobalt complex, as in [(02)Co(salen)(py)], has been central to most investigations of its coordination chemistry. Complexes of the [Co(salen)] family also mediate the electrocatalytic reduction of O2 to H2O2, whereas those incorporating chiral centers on... 

Paulus, P. Pelikan, M. Rudolph, M. Valko, A Comparative Study on the Coordination Chemistry of Cobalt(II), Nickel(II) and Copper(II) with Derivatives of Salen and Tetrahydrosalen Metal-Catalyzed Oxidative Dehydrogenation of the C-N Bond in Coordinated Tetrahydrosalen submitted for publication in Inorg. Chem. 

Salen is an abbreviation of saiicyiethyienediamine and simpier saiens had iong been used as tetradentate iigands for coordination chemistry. 

Salen-type complexes are a fundamental class of compounds in coordination chemistry, known since 1933. They have been extensively studied, and more than 2500 have been synthesized. Interest in salen-type complexes intensified in 1990 when the groups of Jacobsen and Katsuki discovered the enantioselective epoxi-dation of unfiinctionalized alkenes using chiral Mn(5alen) complexes as catalysts. Since that time, an extremely wide variety of reactions catalyzed by salen complexes have been investigated. 

The rich coordination chemistry of palladium provides a plethora of more or less readily available complexes, almost all applicable in type 1 or type 2 Mizoroki-Heck reactions. Only a limited series of truly robust and almost indefinitely stable ( dead ) palladium complexes, such as palladium porphyrinate or phthalocyanine complexes, as well as salen-type chelates with Schiff bases, are known not to release palladium even under the harshest conditions used in Mizoroki-Heck reactions. Results from the investigation of reactivity of... 

The bis-aryloxide ligands obtained by condensation of two equivalents of salicyl-aldehyde with diammines, exemplified by bis(saUcylaldehyde)ethylenediimine (salen), constitute one of the most important classes of ligands in coordination chemistry. ... 

Two kinds of salen-type Schiff-base ligands, conjugated and flexible, have been used in the synthesis of polynuclear lanthanide complexes and lanthanide coordination polymers Lanthanides Coordination Chemistry, Rare Earth Metal Cluster Complexes. The stoichiometry and structures of these complexes are dependent on the Schiff-base... 

Coordinated phenoxyl radicals in Schiff bases and phenolate ligands have understandably attracted the most attention in the past 10 years because of the reversible redox states that can be achieved [78-82]. The most striking example of this redox chemistry was demonstrated by the recent findings with Ni -salen complexes [77, 78]. Shimazaki et al. [78] studied the electrochemical oxidation of [Ni(l)] (Fig. 3). The Ni -radical valence isomer could be obtained in CH2CI2 and converted into the Ni° -phenolate valence isomer simply by changing the... 

---