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Multi-coordination modes

Terbium complexes reported for electroluminescence can be separated mainly into two classes terbium carboxylates and P-diketone complexes. Terbium carboxylates have good luminescence but they are difficult to use as efficient emission materials in OLEDs due to their multi-coordination mode and consequent formation of inorganic polymers with poor solubility or volatility. For these reasons, in this section we will focus on use of the newly developed f)-diketonate terbium complexes in OLEDs. [Pg.455]

In order to understand HDS reactions, it is important to define the ways in which thiophenes are bonded to metal centers on catalytic surfaces. A number of modes in which T interacts with surfaces have been proposed, the most important ones being the one-point adsorption , that is, a strong interaction between the S atom and a vacancy on the surface, and the multi-point adsorption involving the S atom plus one or both of the C=C bonds in a delocalized rr-bonding. While it is difficult to experimentally obtain detailed information on the bonding of thiophenes to surface sites, several coordination modes of thiophenes have been authenticated in metal complexes (Figure 2). [Pg.763]

If the parent molecule is described by normal modes with coordinates q and momenta pk j the multi-dimensional wavefunction is simply a product of uncoupled one-dimensional harmonic wavefunctions ip iQk) (Wilson, Decius, and Cross 1955 ch.2 Weissbluth 1978 ch.27) and the corresponding Wigner distribution function reads... [Pg.101]

Let us discuss here the electron transitions in a condensed medium then, the multi-dimensional space R includes both the coordinates of the molecules where the electron states are localized (the centers of localization) and the coordinates of the particles of the surrounding medium. Therefore, the index s in product (7) numbers all these modes. [Pg.13]

In a previous paper [22], it has been shown that the reaction coordinate is well defined only in the Marcus theory, that is in the classical regime. In this case, the reaction coordinate is along the minimum crossing point in the multi-dimensional potential surfaces (i.e., multi-mode case). In the quantum regime, the reaction coordinate is not well defined especially in the case of the non-relaxed ET like Wm. [Pg.145]

They may be readily transformed to r] -aUcynyl and vinylidene complexes. The coupling of two ) -alkynyl ligands results in platinacyclopentadiene species." A platinum(II) disilyl( -alkyne) undergoes insertion (see Insertion) and reductive elimination (see Reductive Elimination) to disilacyclohexene (Scheme 31)." Metal-diaUcynyls can also play jr-donors to form the coordination complexes of various configurations, as shown in (10-13) and so on." Such a,tt-bridging modes may have interconversion. Multi- aUcynyl complexes can even constitute clusters or higher-order stractures. ... [Pg.3909]


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See also in sourсe #XX -- [ Pg.345 ]




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Coordination mode

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