Function of lanthanides

Catalyst systems containing lanthanides lanthanide oxides as the majority component. 

For double bond isomerization For dehydration/dehydrogenation For synthesis gas (CO-H2) reactions For sulfur oxides (SO ) control 

Supporting other oxides, supporting cluster molecules For carbon oxide methanation 

MODERN ASPECTS OF RARE EARTHS AND THEIR COMPLEXES 

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Fig. 2. Distribution of REE ia the HDEHP—perchlorate system. The lanthanide—yttrium separation factor, E(Ln/Y), is plotted as a function of lanthanide...

Fig. 4.15 The system La(III) acetylacetone (HA) - IM NaC104/benzene at 25°C as a function of lanthanide atomic number Z. (a) The distribution ratio Hl (stars, right axis) at [A ] = 10 and [HA] rg = 0.1 M, and extraction constants (crosses, left axis) for the reaction Ln + 4HA(org) LnA3HA(org) + 3FE. (b) The formation constants, K , for formation of LnA " lanthanide acetylacetonate complexes (a break at 64Gd is indicated) circles n = 1 crosses n = 2 triangles w = 3 squares w = 4. (c) The self-adduct formation constants, for the reaction of LnA3(org) + HA(org) LnA3HA(org) for org = benzene. (A second adduct, LnA3(HA)2, also seems to form for the lightest Ln ions.) (d) The distribution constant Ajc for hydrated lanthanum triacetylacetonates, LnAs (H20)2 3, between benzene and IM NaC104. (From Ref. 28.)...

Separation factors of lanthanide pairs is also a function of lanthanide nitrate concentration as shown in Fig. 1.10. 

The experimental lattice parameters as a function of lanthanide atomic number show the famous lanthanide contraction, the decrease of the lattice parameter across the lanthanide series, with the exception of the two anomalies for Eu and Yb, as seen in Figure 1 (top panel). What is plotted there b actually the atomic sphere radius S (in atomic units) as a function of the lanthanide element A similar behaviour is abo observed, for example, for lanthanide monochalcogenides and monopnictides, whose lattice parameters are abo shovm in Figure 1 (middle and bottom panels). 

A similar trend is seen for the enthalpy of formation of Ln +(aq) which shows more or less constant values for all Ln + ions except Eu and Yb. The trend as a function of lanthanide is shown in Figure 14, which contrasts with the rather smoother trend seen in the enthalpy of hydration of the ions seen in Figure 10. 

Fig. 15, The Curie temperatures of Y-T and Gd-T as a function of lanthanide concentration. In addition, the ordering temperatures of the y-Fe, hcp-Co and fcc-Ni are shown.

Fig. 20. A, and as a function of lanthanide elements for RFcj, RC04B, R2Fe,4B and RNij. Data taken liom Due et al. (1993a).

R. C. Feber and C. C. Herrick, Ideal Gas Thermodynamic Functions of Lanthanide and Actinide Elements , Los Alamos Scientific Laboratory, University of California, Report LA-3184, 1964. 

Fig. 39.6. Enzyme activity as a function of lanthanide ionic radius. Filled circles relative biosynthetic activity of adenylated glutamine synthetase, data from Wedler and D Aurora (1974). Open circles reciprocal half-times for the conversion of trypsinogen to trypsin, data from Gomez et al. (1974).

In addition, we were not only able to calculated data not reported (or calculated) before but also to suggest new values for monoclinic lanthanide trichlorides and to find out the reason for noticeable discrepancies between the thermodynamic characteristics of these compounds and the results reported in review articles (Kovacs and Konings, 2003 Myers and Graves, 1977b). Additional proofs in favor of our approach to calculations of the thermodynamic functions of lanthanide halides will be presented after the description of these parameters for RCI2. 

The luminescence properties of lanthanide complexes can be enhanced by design of chemical structures. However, the correlation between coordination structures and luminescence properties of lanthanide complexes has been scarcely investigated. In this thesis, the correlation between coordination structures and photophysical properties of lanthanide complexes with phosphine oxide ligands were demonstrated. Additionally, functionalization of lanthanide compounds was also described in terms of lanthanide coordination polymers. This thesis gives the first systematic studies on molecular photo-science between lanthanideflll) coordination chemistry and photo-functional materials science. 

MHCOj" expressed in terms of as a function of lanthanide atomic number. Figure 2... 

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