5-Boronoisophthalic acid is a bifunctional organic compound featuring both a boronic acid group and two carboxylic acid groups attached to a benzene ring. Its molecular formula is C8H7BO6, and it serves as a key building block for constructing porous coordination polymers (PCPs) and metal-organic frameworks (MOFs). The presence of both boronic acid and carboxylate moieties allows for diverse coordination modes with metal ions, enabling the design of materials with tailored pore sizes and surface functionalities. This compound is primarily utilized in the synthesis of functional adsorbents for gas storage, separation, and catalysis. The boronic acid group can also form reversible covalent bonds with diols, making it valuable for developing saccharide-sensing materials or chromatographic stationary phases. Additionally, it acts as a versatile synthetic intermediate in organic chemistry, particularly in Suzuki-Miyaura cross-coupling reactions, where the boronic acid group facilitates carbon-carbon bond formation. Its dual functionality also makes it a candidate for surface modification of nanomaterials and the preparation of covalent organic frameworks (COFs).