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Coordination complexes are molecules consisting of a central metal atom or ion connected to surrounding atoms, ions, or molecules called ligands. The ligands stabilize the metal and can alter its properties, such as its solubility, reactivity, and toxicity. This alteration in properties allows some toxic metals to become less toxic or even beneficial when part of a coordination complex.

Toxic metals are metals with high toxicity, which can cause various health problems when they accumulate in the body. Common examples include mercury, lead, and cadmium. These metals can damage the nervous system, disrupt hormone regulation, and cause kidney damage or other severe health issues.

A coordination complex can modify the properties of a toxic metal by changing its reactivity, solubility, and interaction with biological molecules. This can lead to reduced toxicity and even potentially beneficial effects. In some cases, the coordination complex may target specific biological pathways or molecules that help treat certain diseases, while reducing potentially harmful side effects associated with the toxic metal.

A coordination complex of a toxic metal could be useful in medicine under the following circumstances: 1. The toxic metal is part of a coordination complex that reduces its toxicity and side effects, making it safe for medical use. 2. The coordination complex has a specific mode of action, targeting a particular biological pathway, protein, or molecule relevant to the disease being treated. 3. The complex has been well-studied and demonstrated to be effective in treating specific medical conditions, with minimal risk of adverse effects. 4. There are limited alternative treatments available for the specific medical condition, making the use of a toxic metal complex necessary or advantageous. One example of such a coordination complex used in medicine is cisplatin, a platinum-containing compound widely used as a chemotherapy agent. Cisplatin forms coordination complexes with DNA in cancer cells, which leads to cell death, and its success in treating certain types of cancer outweighs the potential side effects caused by the toxic metal.