Synthesis And Characterisation Of Multidentate Ligands Containing N And S Atoms And Their Transition Metal Complexes

In this dissertation, the design, synthesis and characterisation of a serial of multidentate ligands containing N, S atoms and their transition metal complexes are discussed. It comprises mainly following three aspects:1. Using either 2,6-bis(hydroxymethyl)pyridine or 2,6-dimethylpyridine as precursor, we synthesise an organic ligand, 2,6-mercaptanpyridine. Its reaction with iron carbonyl compound gives a triiron carbonyl complex, [Fe₃(μ₃-S)₂(CO)₉]. The complex is characterised using infrared spectroscopy and X-ray crystallography. It is also electrochemically studied towards the catalytic reduction of proton.2. Starting with 1,2,4,5-tetramethyl benzene, we synthesise a novel ligand containing both N and S atoms, which shows selective omplexation towards Cu²⁺. The reaction of this ligand with pyridine-2,6-dicarbaldehyde leads to the synthesis of macrocyclic Schiff base complexes under the templation of transition metal ions. All compounds/complexes are characterised using elemental analysis, IR and ¹H NMR spectroscopies and electrochemistry. Possible compositions of the synthesised transition metal complexes are also proposed.3. Anthracene macrocyclic derivative is synthesised using anthracene and 2-aminemethylpyridine as main precursors. Preliminary characterisation for some of the synthesised compounds is carried out using IR and ¹H NMR spectroscopies.