crystalline pyridine base (Rpy) complexes of cadmiumchloride 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