Synthesis, characterization, photoluminescence and computational studies of mono- and diorgano-gallium complexes containing azo linked salicylaldimine Schiff bases

• Organogallium complexes with azo linked salicylaldimine Schiff bases are reported.
• Photoluminescence quantum yield of the complexes is higher than the free ligands.
• The emission peaks of complexes are blue shifted with respect to free ligands.
• Structure and energy information for a complex was obtained using DFT.

The reactions of triorgano-gallium etherate with azo linked salicylaldimine Schiff bases in benzene gave complexes of the type [R2GaOC6H3(NNPh) (CHNAr)], [R2GaOC6H3(NNPh) (CHNCH2–)]2, [{R2GaOC6H3(NNPh) (CHNCH2CH2}3N] and [C6H5–NN–C6H3(4′-OGaRO)-3′-CHN–C6H4] (R = Me or Et; Ar = Ph or tol-4). These complexes have been characterized by elemental analysis, IR, UV–Vis, NMR (1H and 13C{1H}) spectroscopy. The molecular structures of [Me2GaOC6H3(NNPh)CHNPh]·½C6H6 (5a·½C6H6) and [Me2GaOC6H3(NNPh) (CHNtol-4)] (5c) were established by X-ray crystallography. Density functional calculations have also been performed to obtain structure and energetic information for the bare ligands and the metal-ligand complexes. Photoluminescence studies of these complexes showed that the quantum yield is always higher than that of the corresponding ligands and the emission peaks of complexes are blue shifted with respect to ligand.

Mono- and diorgano-gallium complexes containing azo linked salicylaldimine Schiff bases were synthesized. Photoluminescence studies show that the quantum yield of the complexes is higher than corresponding ligands and their emission peaks are blue shifted. DFT calculations were performed for one of the ligands and its metal complex.Figure optionsDownload as PowerPoint slide