Metallic correlation

The work functions of metals correlate with their surface energies Fig. 4.11 shows this for sp metals. Hence the surface energy of a metal with a high work function is lowered when it is covered with a monolayer of a metal with a lower work function and lower surface energy. 

Role of Aqueous and Aerial Migration in Pollutants Exposure It is well known that the total content of water-soluble solids in natural waters (TSS) is increasing with an increasing aridity. The concentration of some trace elements (heavy metals) correlates significantly with the total content of soluble solids. Comparison... 

The impressive increase in the ee values achieved in stoichiometric reactions compared to those in catalytic runs strongly indicates that the configuration at the metal correlates with the stereochemistry of the catalytic outcome only if (R, Rc)-9 and (Sj, Rc)-9 diverge in enantioselection, it is possible to achieve zero ee working with / jr,/ c/5ir,/ c mixtures and up to 93.5% ee using pure (Sir,Rc)-9 as catalyst. 

Fischer, D.A. and Valenti, J. (2005) The planet-metallicity correlation. Astrophysical Journal, 622, 1102-1117. 

The second article deals with the synthesis and properties of metal correlates and corrinoids. In view of the many articles written on corrinoids, the correlates are in the foreground of the article, adetailed discussion oftheir structures, of their IR-, UV/Vis-, photoelectron-, and NMR spectra, and of their electrochemical behavior being given. Sylvia Licoccia is Professor of Chemistry at the University of Rome Tor Vergata and has not only made notable scientific contributions to corrole chemistry, butto porphyrin chemistry as well. 

Finally, one should not overlook the possible role of correlation effects in atom-metal differences. In atoms the dominant contributions to the correlation energy arise from interaction between electrons of the same principal quantum number n, since these have the greatest overlap. As far as purely intraatomic electrons are concerned, the correlation terms differ very little between atom and metal correlation does, of course, affect interatomic screening of the final state vacancy in metals. 

Since the strength of the metal-ligand bond is directly related to the metal-ligand stretching constant, it is expected that the v(M—O) vibrations will be in the order Al, Ga, In > alkali earth > alkali metals . Correlations were found between the stability constants... 

Indeed, the metal humic acid complexation constants obtained for trace metals correlate reasonably well with the hydroxide and carbonate stability constants of the metals (Turner et al., 1981). Humic and fulvic acid complexation is therefore most likely to be significant for those cations that are appre-... 

By inspection of Table 1, one might group the possible metal correlation partners of into three classes. One group has lower y values ( Li, Fe, Rh,... 

The application of C, metal correlation spectroscopy is very recent and only the first examples from selected nuclei have been published. We therefore follow, in the discussion, simply the periodic table. 

Currently NIR spectrometry is most commonly used to predict or monitor macroconstituents, i.e. >0.1-1% of the sample weight. Common constituents are carbohydrates, cellulose and hemicellulose, proteins and lipids (Osborne Feam, 1986 Davies Williams, 1996). Constituents other than those containing organic, hydrogen bonds have also been monitored by NIR, e.g. heavy metals (Malley et al., 1996). Such NIR applications are based on indirect or correlative modelling, i.e. the concentration of the constituent of interest (e.g. a heavy metal) correlates with some organic constituent occurring at levels detectable by NIR. 

Does the reactivity of a metal correlate with its first ionization energy Explain. 

T.J. Bastow, M.I. Burgar, C. Maunders, Electric field gradients in metals correlation of experimental results with ab initio calculation. Solid State Commun. 122 (2002) 629-632. 

Iron and other transition or divalent metal ions react with polyunsaturated fats, abstracting an electron or a hydrogen atom (see Equation 1). The reaction of a polyunsaturated lipid, LH, with a prooxidant such as a transition metal ion, X, generates a lipid free radical, L. The initiation of oxidation by metals correlates to the ignition source, the match, in the combustion triangle. 

Activation by noble metals. Correlation tvith oxide basicity. /. Phys. Chem., 100, 9429-9438. 

The interaction of bare monovalent (alkah metals and coinage metals) and divalent (alkaline earth and zinc group metals) cations with the N7 site of piuine NA bases was examined in gas phase using MP2/6-31G(d,p)//HF/6-31G(d,p) level of theory (Burda et al. 1996). A graphical illustration of the dependence of the coordination distance on the atomic number of the cations is displayed in O Fig- 36-1. The intermolecular M-N7 distance monotonicaUy increase with the atomic numbers for the alkali metals and metals of alkaline earths (cf. O Fig. 36-1). This increase of the distances is more pronounced for the alkali metals where it exceeds 1 A. The calculated M-N7 distances for both types of metals correlate well with the known ionic radii, e.g.. Tide (1977). The influence of the relativity for the 5s and 5p electrons (Cs, Ba ) is not as pronounced as for the 5d electrons (Au, Hg ) (Pyykko 1988). 

It can be seen in Figure 8.15 that Pd overlayers on a number of metals except Au and Ag lead to downshifts in the d-band center and hence to weaker adsorption bonds. This has been explored in a set of electrochemical experiments illustrated in Figure 8.16, showing that shifts in the d-band center induced by the underlying metal correlate very well with the observed change in hydrogen adsorption energy. 

L. Brewer, A most striking confirmation of the engel metallic correlation, Acta Metall. 

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