Abstract
A series of four new long chain triorganotin(IV) esters containing a diazenyl- and an imino-groups appended with ferrocene scaffold were designed and synthesized. Ferrocene based metallo pro-ligands H'HFcL1 and H'HFcL2 were obtained by reacting isomeric 3-/4-ferrocenylanilines with 2-[(E)-2-(3-formyl-4-hydroxyphenyl)-1-diazenyl]benzoic acid, which upon reactions with appropriate triorganotin(IV) precursors yielded compounds namely, [nBu3Sn(HFcL1)] 1, [Ph3Sn(HFcL1) 2, [nBu3Sn(HFcL2)] 3 and [Ph3Sn(HFcL2) 4. Compounds 1–4 have been characterized by elemental analysis and their spectroscopic properties were investigated using IR, UV-Vis and NMR spectroscopic techniques. The molecular structures of H'HFcL1 and two representative heterobimetallic compounds 3 and 4 have been determined by X-ray crystallography. Compound 3 is a 1D polymer and 4 is a discrete molecule; their structural differences relative to those of H'HFcL1 clearly indicate the influence of the binding of the tin cluster. The redox properties of the metallo pro-ligands and their compounds were also investigated by cyclic voltammetry.
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