Abstract
AbstractThe conductance behavior of the tetraphenylboride salts of the alkaline earth metals (MB2) has been studied in the temperature range from + 20°C to ‐70°C in tetrahydrofuran (THF). A detailed knowledge of their dissociation into free MB−+ and B− ions is desirable in order to better understand their influence in anionic polymerizations of e.g. styrene with alkaline earth metals as counterions. The thermodynamic parameters as well as the λ+0‐values for the respective salts are taken to indicate a double solvent separated ion pair structure for the calcium and strontium salt represented as B−//M2+//B− and a mixed ion pair structure for BaB2 represented as B−, Ba2+//B−. For MgB2 an ion pair structure B−, Mg2+//B− is proposed at higher temperature changing to B−//Mg2+//B− at lower temperatures.
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