Solution equilibria of beryllium(ll) and cadmium(ii) complexes with halide and thiocyanate ions are studied in N,N-dimethylacetamide (DMA) by calorimetry. Mononuclear Be" complexes, [BeX]' and [BeX,] (X = CI, SCN), and Cd" complexes, [CdX]', [CdX,], [CdXJ-and [CdX,]' -(X = CI, Br, I, SCN), are found, and their formation constants, enthalpies and entropies are determined. The Be" systems are also studied in N,N-dimethylformamide (DMF). Each of t h e Be" complexes has very similar thermodynamic quantities in DMA and in DMF, in sharp contrast to first-row transition metal(ii) complexes where a marked solvent effect has been observed. In spite of t h e very small size of t h e cation, steric hindrance of DMA is absent in the four-coordinate solvation structure of Be2+.
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