4-(4-Pyridinyl)phenylboronic acid is an organic compound featuring a phenylboronic acid group linked to a pyridine ring. This structure combines an electron-deficient pyridine unit with a boronic acid functional group, making it a versatile building block in organic synthesis, particularly in Suzuki-Miyaura cross-coupling reactions. Its primary application is in the field of materials science, specifically in the development of organic electronic materials. The molecule serves as a key precursor for constructing conjugated organic semiconductors used in organic light-emitting diodes (OLEDs) and organic photovoltaics (OPVs). The pyridine moiety can act as an electron-accepting unit or a coordinating site for metal complexes, while the boronic acid enables the formation of extended π-conjugated systems through coupling with aryl halides. This compound is a valuable synthetic intermediate for researchers designing novel charge-transporting materials, emitters, or host materials in OLED devices. It is typically handled under inert atmosphere due to the sensitivity of the boronic acid group and requires standard precautions for laboratory chemicals.