Synthesis And Characterization Of The Titanium Complexes Supported By [N, N, O] And [O, N, O] Ligands And Nickle Complex Supported By [N, N] Ligand

Condensation of o-aminophenol with 5-t-Bu-pyrrole-2-aldehyde and benzoylacetone led to the formation of o-(OH)C₆H₄-N=CH-2-(5-t-Bu -C₄H₂NH) (HL¹,1) and o-(OH)C₆H₄-N=C(CH₃)CH₂COPh (HL², 2) respectively. In addition, the reaction of 5-t-Bu-pyrrole-2-aldehyde with 2,6-diisopropylaniline afforded another ligand R-N=CH-2-(5-t-Bu-C₄H₂NH) (R = 2,6-i-Pr₂C₆H₃, HL³, 3). Treatment of HL¹ and HL² with TiCl₄ in THF generated respectively (THF)Ti^-Cl₄[O-o-C₆H₄-N⁺H=CH-2-(5-t-Bu-C₄H₂NH)] 4 and (THF)TiCl₂[-O-o-C₆H₄NH=C(CH₃)CH=C(Ph)-O-] 5 (2). The reaction of HL³ with one equivalent of NaH in THF produced R-N=CH-2-(5-t-Bu-C₄H₂NNa) (R = 2,6-i-Pr₂C₆H₃) (L³Na). The bis(pyrrolylaldiminato)complex [2-(2,6-i-Pr₂C₆H₃N=CH)-5-t-Bu-C₄H₂N]2Ni (6) of nickel was synthesized by the reaction of trans-bis(triphenylphosphine) phenylchoronickel(â…¡) with L³Na. Complexes 4 and 5 were characterized by IR,¹H NMR and MS spectra. The molecular structures of 4 , 5 and 6 were determined by X-ray single crystal diffraction analysis. Furthermore, some spectral properties of compounds 1, 2, 4 and 5 have been observed by Ultraviolet and Visible Spectra. The brief study for ethylene polymerization of 4 and 5 were carried out.