The coordination compounds have been prepared with molybdenum and sulphoxide and thiantrene -V- oxide.The subject has been chosen for two aspects. One is, molybdenum plays an important role in plant and animal bodies and acts as a catalyst. Also it is a fact that some bacteria such as azotobacter vinelandii and nitrogenase can not fix atmospheric nitrogen without molybdenum. Secondly the diphenyl sulphoxide and thiantrene -V- oxide act as very good ligands for thoruim and uranimu which are transition elements.