Synthesis, Characterization and Reactivity of Tetrakis(4-Bromophenoxo) Titanium(IV) Complex

Introduction: The organometallic chemistry associated with the metal aryloxide compounds is growing rapidly. Research has focused on the ligands'; reactivity, for example, the insertion chemistry of the M-OAr bonds, and on the organometallic reactivity that can be supported by aryloxide ligation. Species of titanium bonded to aryloxo ligands are often used as base compounds for material engineering, catalysts, or initiators for different kinds of polymerization processes, and biodegradable materials. Method: A tetrakis(4-bromphenoxo)titanium(IV), Ti(OC6H4Br-4)4, complex has been synthesized using titanium tetrachloride with four moles of 4-bromophenol in carbon tetrachloride. Double phenoxide of composition Na2[Ti(OC6H4Br-4)6] was prepared by reacting Ti(OC6H4Br-4)4 in methanol with sodium bromophenoxide dissolved in the same solvent in a 1:2 (titanium: alkali metal) molar ratio. Reactions of Ti(OC6H4Br-4)4 with pyridine, diethylamine, and triethylamine were carried out in a 1:2 molar ratio, while with bidentate ligands, namely 1,10-phenanthroline and 2,2/-bipyridyl, reactions were carried out by mixing them in the equimolar ratio in dry benzene. The chelates with chelating agents such as benzoin, salicylaldehyde, and 2-hydroxyacetophenone were prepared with Ti(OC6H4Br-4)4 taken in methanol with a bimolar amount of chelating agent. Result: Ti(OC6H4Br-4)4 is also characterized using elemental analysis, IR, 1H NMR, mass spectrometry, X-ray diffraction studies, and thermal analysis. The 4-bromophenol ligand binds to metal via the oxygen of the phenoxy group, and the compound has been assigned a dimeric structure bridging through phenoxy groups. Conclusion: Moreover, the complex Ti(OC6H4Br-4)4 forms a double phenoxide, behaves as a Lewis acid, and forms mixed chelate complexes.