A ladder - like tetranuclear organooxotin cluster[(μ-O)(μ-OH)(6,8-Cl2C9H3O2CO2)(n-Bu2Sn)2]2 is synthesized by the reaction of dibutyltin oxide with 6,8 - di - chlorocoumafin - 3 - carboxylic acid under microwave radiation. Its structure is characterized by IR, elemental analysis and X - ray single crystal diffraction. The results show there are three Sn202 four - membered rings in the com- plex, which allow the complex to form a ladder - like structure, and each of four tin atoms is fi...