Primarily used in organic synthesis, 9-iodophenanthrene serves as a versatile intermediate in the preparation of various complex molecules. It is particularly valuable in cross-coupling reactions, such as the Suzuki and Heck reactions, where it facilitates the formation of carbon-carbon bonds. This compound is also employed in the development of organic semiconductors and optoelectronic materials due to its aromatic structure, which enhances electron mobility. Additionally, it finds application in the synthesis of fluorescent dyes and probes for biological imaging, leveraging its ability to absorb and emit light effectively. In medicinal chemistry, it is utilized to create potential pharmacophores for drug discovery, especially in targeting diseases like cancer and inflammation.