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Unformatted text preview: in complexes 2 and 4. However, for distannoxane dimer (complexes 1 and 3), the 119 carboxylate anions are found to exhibit monodentate and bidentate manner. In Sn NMR solution study, the tin atoms of complexes 1 – 3 were five-coordinated and four-coordinated in complex 4. From 119 the Sn NMR, the tin atom of complex 2 was five-coordinated, this might be upon dilution, the crystal lattice were broken up resulting the carboxylate anions assembly self -arrangement. Hence, one of the carboxylate anions was located close to the tin atoms and exhibited bidentate chelatation while the other carboxylate anion exhibited monodentate chelation in complex 2. In addition, complexes 1 – 4 obtained were screened for their biological activity including cytotoxicity and antibacterial. Generally, complexes 1 – 4 obtained possessed promising biological screening activity compared to the parent acid. 1 126 3rd ICYC 2010 Universiti Sains Malaysia INO-O8 23rd-25th June 2010 SYNTHESIS, CHARACTERIZATION AND CATALYTIC BEHAVIOUR OF TUNGSTEN CONTAINING SILICA FROM RICE HUSK IN THE LIQUID PHASE OXIDATION OF STYRENE Anwar Iqbal and Farook Adam School of Chemical Sciences, Universiti Sains Malaysia, 11800 Pulau Pinang, Malaysia E-mail: [email protected] Tungsten containing mesoporous silica has been synthesized at room temperature in basic, neutral and acidic medium via sol-gel method. The silica precursor was extracted using solvent extraction from rice husk. The catalysts were characterized by means of N 2 sorption studies, XRD, TEM, SEM-EDX, FT-IR, DRUV Vis, Raman FT-IR and AAS. XRD analysis indicates the increase in catalysts crystallinity when the incorporation was carried out in acidic medium. The catalytic activity was tested in the liquid phase oxidation of styrene using environmentally benign hydrogen peroxide. Highest styrene conversion was achieved when the reaction was carried out using the catalyst prepared in acidic m edium and benzaldehyde was obtained as the main product. No tungsten spe...
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This note was uploaded on 02/17/2011 for the course CHEMISTRY 101 taught by Professor Csr during the Spring '11 term at University of Louisville.
- Spring '11