Cisplatinum is considered an important chemotherapeutic drug used against some kinds of cancer. However, the use of this drug may cause side effects such as ototoxicity, neurotoxicity and, mainly, nephrotoxicity. This fact has been related to the interaction of cisplatinum with biomolecules containing sulfur, such as proteins and amino acids. To promote the reduction of these effects, the coadministration of some compounds, called rescue agents, has been suggested in an attempt to prevent the interaction between cisplatinum and those biomolecules. Glutathione, a tripeptide, and the amino acid penicillamine could be used for this purpose. The former is the most important antioxidant in the human body and acts in cell homeostasis, and the latter is used in the treatment of Wilson’s disease and rheumatoid arthritis. Thus, considering the possibilities of interaction between cisplatinum and these sulfur agents, this work intended to synthesize and characterize the compounds formed by them. Using characterization techniques such as elementary analysis, thermogravimetry, and infrared and Raman spectroscopies, it was possible to suggest the structure of each compound, in which the ligands behaved as monodentate, bounding through the sulfur atom. This agree with the theory of soft and hard acids and bases, which predicts the affinity between platinum (Lewis acid) and sulfur (Lewis base). The use of theoretical calculations based on the structures proposed was very useful because it was possible to attribute some bands in the infrared and Raman spectra with more certainty.