| In this dissertation, we mainly discuss the synthesis of a dithiol tridentate ligandcontaining pyridine group and its reaction with Fe3(CO)12. All related compounds arecharacterised using infrared, UV/Vis, nuclear magnetic resonance and massspectroscopic techniques. The model complex (1) for the diiron centre of the [FeFe]hydrogenase derived from the above reaction and its protonated form,[Fe2(CH2S)2(H3C)C(2-C5H4N)(CO)5] (1)and [Fe2(CH2S)2(H3C)C(2-C5H4NH+)(CO)6][BF4](2H+), are structurally elucidated using X-ray crystallography. Substitutionreaction of the complex (1) in appropriate organic solvents with CO is also studied. Aprotonating mechanism for the complex (1) and other related complexes isinvestigated. Their electrochemical behaviours and electrocatalysis towards protonreduction are probed using cyclic voltammetry. A pentacarbonyl complex (3) isolatedfrom the same reaction from which the complex (1) is obtained, whose accuratestructure is yet known, is preliminarily studied.Based on literature procedures, a dithiol tridentate ligand containing amino groupand its iron carbonyl complex (4) are synthesised and characterised. An attempt isalso made to protonate this complex.
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