This thesis consists of three parts of the research work. Part A contains the synthesis and characterization of synthesized free ligands and organotin(IV) carboxylates. Part B consists of biological screening of all the compounds. Part C is composed of deposition and characterization of thin films of selected organotin(IV) carboxylates by AACVD method. A series of twenty-three free ligands (HL1-23) were synthesized by reacting substituted aniline and anhydrides. Three free ligands (HL24-26) were prepared by reacting chloroacetic acid with phenols in the presence of base. Free ligands 27 and 28 were purchased from Aldrich and were of research grade. The synthesized free ligands were characterized by using FT-IR, multinuclear (1H, 13C) NMR spectroscopy and MS spectrometry. Total 66 tri/diorganotin(IV) carboxylates having general formula (C6H5)3SnL, (C4H9)3SnL and (C4H9)2SnL2(L= ligand) were synthesized by reacting ligand acid and respective organotin hydroxide and oxide. The characterization of as-synthesized organotin(IV) carboxylates was carried out by elemental analysis, FT-IR, multinuclear (1H, 13C and 119Sn) NMR spectroscopy and mass spectrometry. Twenty-two complexes were solved by using single crystal X-rays analysis. All the compounds were screened for their antibacterial and antifungal activities against various strains of bacteria and fungi. Brine-shrimp lethality bioassay was used to evaluate the cytotoxicity of all the compounds. The selected organotin(IV) carboxylates were tested for their antioxidant, antileishmanial, polyphenol oxidase (PPO) inhibition and anticancer activity. The interaction of some selected complexes with SS-DNA was carried out using UV-visible spectroscopy. Aerosol assisted chemical vapor deposition technique was used to deposit the thin films of some selected compounds (2, 10, 17, 30, 37 and 38) using as a single source precursor.The as-deposited thin films were characterized by powdered X-ray diffraction (PXRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX) techniques. The results revealed that these complexes were excellent precursors for thin film deposition. The results showed that the deposited thin films were of crystalline nature having little to no impurities. The thin films did not have any cracks and were found to have good adhesion.