Rodriguez coordinates

Fernandez, E.J., Laguna, A., Lopez-de-Luzuriaga, J.M., Monge, M., Montiel, M., Olmos, M.E. and Rodriguez-Castillo, M. (2006) Synthesis, coordination to Au(I) and photophysical properties of a novel polyfiuorinated benzothiazolephosphine ligand. Dalton Transactions, (30), 3672-3677. 

The independent control of the association kinetics relative to thermodynamics is therefore desirable, and Yount and others showed that N,CJ -pincei metal-ligand coordination motifs such as 1 2 (Fig. 3.5) are well suited to that goal. Pincer compounds 1 and analogs have been synthesized and smdied extensively (Rietveld et al. 1997 Albrecht and van Koten 2001 Rodriguez et al. 2002 Slagt et al. 

Castro-Rodriguez, I., Olsen, K., Gantzel, P. and Meyer, K. Uranimn complexes supported by an aryloxide functionalised triazacyclononane macrocycle synthesis and characterisation of a six-coordinate U(DI) species and insight into its reactivity, Chem. Commun. (2002), 2764-2765. 

According to Cossee, the isotactic centre has one and the atactic two vacancies. According to Rodriguez, the organometal is coordinated into one of the two vacancies of the isotactic centre. The addition of donors (diethyl ether, triethylamine, pyridine, etc.) greatly affects the polymerization rate (catalyst activity) as well as the ratio of the stereoregular and atactic product components. Donors affect the structure of active centres and modify it. 

A recent study of the mechanism of Ziegler-Natta catal rets has been published by Rodriguez and coworkers 120). These authors showed by dectron microscopy that active sites are found mainly at growth spirals, on lateral surfaces, and on surface defects of the hexagonal a-TiClg crystal platelets. The active site has been proposed to be linked to a surface titanium atom with two chlorine vacancies of the otherwise octahedrally coordinated titanium. In a schematic two dimensional representation the proposed mechanism for propylene polymerization is as follows 120) ... 

Castro-Rodriguez I, Nakai H, Zakharov LN, Rheingold AL, Meyer K (2004) A linear, O-coordinated 1 1-C02 bound to uranium. Science 305 1757-1759... 

We thank Professor James Devillers for inviting us to write this book for the QSAR series, and for his thoughtful comments on the manuscript We thank our editors at Taylor Francis, Hilary Rowe, acquiring editor, Laurie Schlags, project coordinator, and Amy Rodriguez, project editor, for making the production of this book easy and enjoyable for the authors. 

Clarke MJ, Galang RD, Rodriguez VM, Kumar R, Pell S, Bryan DM (1988) In Nicolini M (ed) Platinum and Other Metal Coordination Compounds in Cancer Chemotherapy. Martinus Nijhoff, Boston, p 582... 

The basis of the Cossee-Arlman theory is the concept of a chloride vacancy on the catalyst surface. This idea was first suggested by Boor in a private communication (Arlman, 1964). At the vacancy, monomer is adsorbed on the surface. According to the theory, not all titanium ions are active because most of them are fully coordinated in the octahedral interstices of the crystal. The active sites are found only on certain surfaces of a titanium trichloride crystal where vacancies exist. These arise because in order to have electrical neutrality some titanium ions must be coordinated to fewer than six chloride ions. The above interpretation is consistent with microscopic observations that poisoner growth occurs at boundaries defined by edges or steps of platelets (Hargitay et al., 1959 Rodriguez and Gabant, 1963). 

From this evidence and the reaction mechanisms of Natta [27], Cossee-Arlman [28] and Rodriguez-van Looy [29], the mechanism of the polymerization with R3Al-TiCL, (w = 3,4) is considered as follows Ti has a six-coordination structure. 

Lasheras R, Bello-Galvez C, Rodriguez-Celis E, Anzano J (2011) Discrimination of organic solid materials by LIBS using methods of correlation and normalized coordinates. J Hazard Mater 192 704-713... 

Figure 4.35. The adsorption of N2, SO2, CH3OH and H2O on a non-oxidized carbon (MO) (open symbols) and a carbon oxidized with nitric acid (M15N) (closed symbols), expressed in DR coordinates, showing major differences in extents of adsorption between polar molecules (Rodriguez-Reinoso et al, 1992).

Figure 6.12. Relationship between the methane adsorbed at 3.4 MPa by the carbon disks, from many sources, and the volume of micropores deduced from the adsorption of nitrogen and carbon dioxide. The coordinate and the slope of the straight line (y = 0.09x 3- 0.25) correspond to the density of methane in narrow and wide micropores, respectively (Molina-Sabio and Rodriguez-Reinoso, 2004).

Otero Are i, C., Rodriguez Delgado, M., ManoUova, O.V., Tumes Palomino, G., Tsyganenko A.A., and Garrone E. Linkage isomerism of carbonyl coordination complexes formed upon CO adsorption on the zeolite Li-ZSM-5 variable-temperature ETIR studies. Chem. Phys. Lett. 2002, 362, 109-113. 

It is obviously rewarding to find here all of the typical features of the Cossee—Rodriguez model, with the additional observation that the actual oxidation state of the Mj is not a determinant parameter (+4 instead of +3 or even +2 for the heterogeneous system) and, on the other hand, that it provided a suitable geometry and electron distribution, which is a weU-documented fact in coordination catalysis. 

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