Isostructural lines

Thorite and orangite (orange thorite) have a tetragonal structure and are isostructural with zircon. Steady-state spectra under X-ray and laser (337 nm) excitations are connected with REE " ", namely Sm " ", Tb ", Dy " " and Eu ". Reabsorption lines of Nd " have been also detected (Gorobets and Rogojine 2001). Laser-induced time-resolved luminescence enables us to detect Eu " and uranyl emission centers (Eig. 4.70). 

Fig. 16. Specific heat of NpOsj plotted as CVT versus T. The solid line is derived from the non magnetic isostructural NpRu2. (Brodsky and Trainor " )...

Fig. 17. SpeciEic heat versus temperature for UAs (solid curve) and isostructural non-magnetic ThAs (point-dashed curve). The dashed line represents the estimate lattice specific heat of UAs and the small dashed line a law of short range magnetic ordering effect. (Blaise et al. )...

Fig. 1. Temperature variation of the cubic lattice parameter of GdAl2 measured by x-ray powder diffraction (this work). The small points connected by a line indicate the corresponding values of the isostructural YAI2 (nonmagnetic reference), scaled to coincide with GdAl2 at 230 K, in order to allow a direct comparison.

FIGURE 16. Normalized superimposed solid-state emission spectra recorded at room temperature for isostructural compounds 9 (solid line) and 10 (dotted line) after excitation at 360 nm. 

The variation in hardness theoretically predicted for the TiN/NbN multilayers compared with data for the isostructural nitrides shown in Fig. 8.1(a). The predictions are based on the ideas of an increment of hardness arising from the elastic mismatch across the layers, equation (8.6), shown as the horizontal dashed line, and for the lateral flow of material within the interlayers, equations (8.10-8.12), shown as the dashed line increasing as the wavelength decreases. In the isostructural multilayers, the upper limit to the increase in hardness should occur when the stress is high enough to drive dislocation motion across the layers. In the nonisostructural, this condition does not apply, or is substantially modified. The lines shown assume that the hardness of monolithic TiN and NbN is 25 GPa and that the layer thicknesses are equal. Other data are given in Table 8.1. 

H3 = 59° in the crystal structure of [Eu(L2)3]3+). Although no analysis of these data using the crystal-field independent two-nuclei technique (eq. (51)) has been reported, plots of 5 a/(Sz)j vs S f / Sz)j based on the data reported by Petoud et al. (1997) suggest the existence of a single straight line for R = Ce-Dy, thus confirming isostructurality (fig. 13). 

The analyses of the II-NMR data with the crystal-field independent technique (eq. (51)) display straight lines for plots of 5 ara/(5 z) - vs / Sz)j in complete agreement with isostructurality along the complete lanthanide series and no significant change of the G factors (fig. 24). 

Fig. 5 Anticancer activities of the isostructural kinase inhibitors DWI2 (M = Ru) and DWHOs (M = Os) against the 1205Lu melanoma cell line. LC50 curves were determined using the MTT cell viability assay after treatment with the inhibitors for 72 h. An average of five independent experiments is shown...

Another, perhaps clearer indication for isostructural character is given by solid-state,, 3C cross-polarization magic angle-spinning (CPMAS) NMR. A comparison of the high-field spectra revealed strong similarities for the decaphenylgermanium and tin compounds (the amorphous lead complex produced broader lines) (120). 

A number of other lines of evidence have now been developed to show that the above argument is correct. In the series of isostructural species48 shown below the Re-Re distances have been found to vary rather little even though the bond order changes from... 

The cations Fe and Al " are both considered hard acids by Pearson (3. Thus, it is not surprising that a plot comparing stabilities of the isostructural complexes and minerals gives a strong correlation. The oxygen-donor species, in particular, plot nearly on a straight line. The almost exact linearity of the OH... 

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