This book chapters deals with synthetic development of new phosphonic acids and phosphate ligands. Interaction of these phosphorus based ligands with various main group-, transition metal ions and organotin precursors. The metal aggregates thus prepared were structurally and spectroscopically characterized. These aggregates were shown to be good single molecular precursors for material purpose. Ceriumphosphonate were utilized as catalyst for prepare pharmaceutically valuable functionalized dihydropyrimidines (three-component Biginelli reaction). All the di-nuclear metal aggregates were found...