Synthesis, Characterization, NMR Spectroscopic, and X-Ray Crystallographic Studies of New Titanium(IV) Schiff Base Salen Complexes: Formation of Intriguing Titanium(IV) Species

Document Type

Article

Publication Date

5-24-2020

School

Polymer Science and Engineering

Abstract

The H2salen ligand 1 was used as a precursor ligand to produce a series of new complexes, [Ti(salen)(OPh-m-CH3)2] 2 (where salen = N,N’-ethylenebis(salicylideneiminate) dianion and −OPh-m-CH3 = 3-methylphenolato), [Ti(salen)(OPh-p-NO2)2] 3 (where −OPh-p-NO2 = 4-nitrophenolato), [Ti(salen)(3,5-bis(trifluoromethyl)phenolate)2] 4, Ti(salen)(OPh)2] 5a (where −OPh = phenolato), [Ti(salen)(OPh-o-F)2] 6a (where −OPh-o-F = 2-fluorophenolato), [Ti(salen)(OPh-p-CH3)2] 7a (where −OPh-p-CH3 = 4-methylphenolato), [Ti(salen)(OPh-o-CH3)2] 8 (where −OPh-o-CH3 = 2-methylphenolato), [Ti(salen)(OPh-m-F)2] 9 (where −OPh-m-F = 3-fluorophenolato), and [Ti(salen)(OPh-p-F)2] 10 (where −OPh-p-F = 4-fluorophenolato). The ligand and the complexes were characterized by elemental analysis, FTIR, 1H, 19F, and 49Ti NMR spectroscopies, and X-ray crystallography. All the complexes, as synthesized, were consistent as mononuclear titanium(IV) complexes, but complexes 5b, 6b, and 7b after being characterized by X-ray crystallography were found to be binuclear in nature. 49Ti NMR spectroscopic studies proved that this is the very first report of 49Ti NMR spectra of titanium(IV) complexes with Schiff bases as ligands in deuterated chloroform.

Publication Title

Inorganica Chimica Acta

Volume

505

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