Ce complex

Nous disposons done pour le processus —dissociation de complexes associ.es—formation de ces complexes —de la constante d eauilibre et de la constante de vitesse de dissociation. II est aise par consequent de d6duire la constante de vitesse d association Pn m + Pm... 

The importance of these two factors can be easily understood by the following examples. Shinkai and coworkers widely employed a double-decker architecture of the center-to-center bound bis-porphyrins 32-39 designed on the basis of //-oxo dimers and Ce complexes to sense the chirality of... 

The ditelluride complex is a centrosymmetric dimer [177] and the Yb is tetrahedrally bonded to two Cp ligands and to the Te - ion. The structure of Se complex [178] has a linear Se-Yb-Se bridge (170.1°) with two Cp Yb units mutually staggered and the compound is seven coordinate. The structure of Ce complex [180] shows a rare example of Ce-S dative bond with Ce-S distances of 3.058 and 3.072 A. 

Figure 4.19 A photo of a cylindrical reaction tube with the occurring BZ reaction. The horizontal regions result from the formation of spatio-temporal dissipative structures in the tube. The light bands indicate the step of the formation of badly colored Ce" + complexes.

Costes, J.R, Dahan, E, Novitchi, G, Arion, V., Shova, S., and Lipkowski, J. (2004) Macrocyclic and open-chain Cu -4f (4f = Gd , Ce ) complexes with planar diamino chains structures and magnetic properties. European Journal of Inorganic Chemistry, 1530-1537. 

In past decades, lanthanide complexes (except Pm, Sc, and Ce complexes) and related electroluminescent devices have been studied extensively. In this section we describe recent progress in lanthanide complex-based luminophores, especially for Eu and Tb complexes, which are being developed for improving the color properties of electroluminescent displays. 

Functional group transformations such as oxidations and reductions mediated by Ln and Ce complexes are well established in organic synthesis [13, 176]. However, these processes usually involve stoichiometric and excess amounts of metal reagent. 

The toluene oxidation reaction was used as a probe to study the catalytic properties of the Mo-Ce complex oxides. The as-prepared oxides were introduced into a U-type quartz fixed bed microreactor and their catalytic properties for selective oxidation of toluene to benzaldehyde were evaluated under the reaction conditions of O.lMPa, 400 C, air/toluene = 9 (vol/vol), F/W =1900 ml/h g cat. The reaction products were analyzed by an on-line gas chromatography. Under the above reaction conditions, the main products were CO, CO2, H2O and benzaldehyde. 

Oxidation of toluene was employed to evaluate the catalytic activity and selectivity of the Mo-Ce complex oxides. The particle size, surface area and structure of ultrafine complex... 

Beside RNA targeting, a monoiminodiacetate-Ce complex conjugated to an ODN has been reported to cleave sequence selectively a ss DNA target (60% yield after 12 hr) (361), but its reactivity toward RNA or ds DNA has not been described. 

The three Schiff-base bibracchial lariat ethers H2l7a-c derivatives have been designed for their ability to form a cryptand-like cavity upon reaction with Ln ions, the size of which can be tuned by varying the number of -CH2-CH2-O- units in the macrocycle. The two 2-salicylaldiminobenzyl pendant arms fold in such a way that tt-tt interactions between aromatic rings result in the formation of a cryptand-like cavity, as demonstrated by the X-ray structure of the Ce complex with 17b depicted on fig. 25 (Gonzales-Lorenzo et al., 2003). The triplet state of the di-anionic receptor is located at 18 750 cm (0-phonon component measured on the Gd complex) so that sensitization of the NIR luminescence is not optimum nevertheless, Nd emission could be detected. 

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