Thermodynamic properties of Li 3 N dissolved in the molten LiCl salt at 900 K were explored using electrochemical methods. It was difficult to determine precisely the decomposition voltage of Li 3 N dissolved in the molten salt by cyclic voltammetry. The oxidation wave of N 3Ϫ ion could not be located with high accuracy. However, the lithium activity of the Pb-Li alloy in equilibrium with the molten salt containing dissolved Li 3 N under nitrogen atmosphere could be measured electrochemically with high accuracy using the Li/Li ϩ reference electrode. Under the conditions used in this study, the potential of the Li-Pb electrode is equal to the decomposition voltage of Li 3 N. The activity of Li 3 N in molten LiCl was determined for anionic fractions of N 3Ϫ ranging from x N 3Ϫ ϭ 10 Ϫ4 to 0.028. The nitride ion concentration in the salt was determined by chemical titration. The activity coefficient of the Li 3 N at high dilution was found to be very low, around 10 Ϫ4 . The activity coefficient increases sharply with composition and has a value of 0.25 at x N 3Ϫ ϭ 0.028.
Source of materialThe manganese carbonyl complex was prepared by a halide abstraction reaction [1] of Mn(CO)3(tmen)Br in dichloromethane using AgBF4. Transparent yellow crystals of the product were obtained by slow recrystallization from dichloromethane at room temperature.
DiscussionTransition metal carbonyl complexes with a weakly coordinated ligands (e.g. H2O, BF4~, AsFö", PFö", SbF6~) have attracted an increasing attention in the last thirteen years [2]. These organometallic compounds are of interest as potential precursors for the synthesis of new complexes because of their very good leaving groups. This X-ray analysis report unambiguously characterizes the manganese^) carbonyl complex with a coordinated water molecule and a un-coordinated BF4" anion. The structure represented by the ORTEP plot (20% probability ellipsoids) excludes the BF4"
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