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Aüfc.and ß for the various donors (1.4 kcal mol-1) could be ascertained.An immediate application of the procedure outlined above is to predict the enthalpy of adduct formation of bis(hexafluoroacetylacetonato)copper(II) with trimethylamine A-oxide in carbon tetrachloride. According to Table II, the reported value in o-dichlorobenzene should be corrected by A7i[Cu(hfac)producing a value of -12.8 kcal mol-1. It is of interest to consider what approach could be taken for a system in which no adduct could be found that is soluble in CC14 or C6Hi2. Thus, although a solvation-free displacement reaction could be obtained, one could not find a solvation-minimized adduct formation reaction for any dorior which could be subtracted to give the result for B'. A reliable spectroscopic method could be developed for estimating enthalpies from frequency shifts of donors (for example,

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Discussion of the adverse/toxic effects of metallic elements, particularly the heavy metals (Cd, Pb, Hg), and biological defenses against these species.

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The author looks at zinc and shows why it has certain properties making it ideally suited to enzymatic reactions of the acid-base type.

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