Abstract
Abstract The heat of decomposition of a series of crystalline pyridine base (Rpy) complexes of cadmium chloride was determined by means of differential scanning calorimetry, where the complexes were bis(pyridine base) complexes, CdCl2·2Rpy (Rpy = pyridine and 4-methyl-, 3-methyl-, 4-acetyl- and 4-cyanopyridine) and mono(pyridine base) complexes, CdCl2·Rpy (Rpy = 2-methyl- and 2-ethylpyridine). The heats of dissolution of the pyridine base complexes, cadmium chloride CdCl2, and pyridine bases in a non-polar aprotic solvent, 1,2-dichloroethane, containing tetrabutylammonium chloride were determined by a calorimetry. The stability of the crystalline complexes is discussed in connection with the heat of dissolution and reaction of the complexes in solution. The stability of the complexes is explained by various interactions, such as the basicity and steric hindrance of the pyridine bases and the intermolecular interaction between the complexes.
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