Spectroscopic studies on some fluorescent mixed-ligand titanium(IV) complexes

A novel route to synthesize some titanium(IV) complexes containing acetylacetone, straight chain carboxylic acid and hydroxycarboxylic acid ligands has been investigated. Complexes with the general formula [Ti(acac)Cl2−n(OOCR*)n(OOCC15H31)] (where Hacac = acetylacetone, R*COOH = hydroxycarboxylic acids and n = 1 or 2) have been isolated and characterized. Molecular weight determinations indicated mononuclear nature of the complexes. LMCT bands were observed in the electronic spectra. Infrared spectra suggested bidentate nature of the ligands. Fluorescent behaviour of the complexes was noticed on the basis of fluorescence spectra. Powder XRD indicated them to be semi-crystalline having the crystallite size in 136–185 nm range. Transmission electron microscopy (TEM) indicated spherical particles of ∼200 nm diameter. On the basis of physico-chemical studies, it is suggested that titanium is having coordination number 7 or 8 in these complexes.

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► Manuscript deals an easier method of synthesis for nano-sized titanium(IV)
► complexes.
► These complexes show fluorescent character and possess Ti–O–C linkage.
► They have high hydrolytic stability.
► Coordination number of titanium is assigned seven or eight in the complexes.
► It is addition to the existing knowledge in the chemistry of titanium(IV).