Water quality and phytoplankton assessment in three selected waterfalls of Kuching and Serian districts, Sarawak

Jasmina, Majit (2008) Water quality and phytoplankton assessment in three selected waterfalls of Kuching and Serian districts, Sarawak. [Final Year Project Report] (Unpublished)

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Abstract

Two tridentate Schiff base ligands, containing a donor set of ONN and ONS were prepared by the reaction of salicylaldehyde with 2-aminothiophenol and benzhydrazide with 2- benzoylpyridine. Four organotin(IV) complexes (3-6) of salicylaldehyde-2-aminothiophenol ligand (1) with RnSnCl4-n (n = 1, 2, 3) have been synthesized in the presence of base in absolute chloroform in 1:1 mole ratio under nitrogen atmosphere. Another three organotin(IV) complexes (7-9) of 2-benzoylpyridinebenzhydrazone ligand (2) with RnSnCl4-n (n = 1, 2, 3) have also been synthesized in the presence of base in absolute methanol in 1:1 mole ratio. Schiff base ligands (1-2) and their organotin(IV) complexes (3-9) have been characterized by CHN analyses, UV-visible, molar conductance and FTIR spectral analyses. Among them, ligand (2) and complex (7) have also been determined by 1H NMR spectral studies. All organotin(IV) complexes (3-9) are non-electrolytic in nature. Based on the FTIR and 1H NMR analyses, ligand (1) acts as dinegative tridentate ligand in the organotin(IV) complexes (3-6). Whereas the ligand (2) acts as uninegative tridentate nature in its organotin(IV) complexes (6- 9). A five-coordinated molecular structure has been proposed for the organotin(IV) complexes (3-6) of ligand (1) while a six-coordinated molecular structure has been proposed for organotin(IV) complexes (7-9) of ligand (2).

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