Monoorgano-gallium and –indium complexes derived from dianionic tridentate ONO Schiff bases: Synthesis, crystal structures and photoluminescence

• Mono-organo Ga/In complexes with benzohydrazide schiff bases were synthesized.
• These complexes have dimeric phenolate oxygen bridged structure.
• Central Ga2O2 ring is slightly bent.
• Variation in interplanar angles is observed with varying substituents.
• Complexes of organo- Ga/In with benzohydrazide schiff bases are emissive in toluene.

Reactions of triorgano-gallium and –indium etherates with N′-(2-hydroxybenzylidine)benzohydrazide and N′-(2-hydroxy-3-methoxybenzylidine)benzohydrazide in refluxing benzene afforded complexes of composition [{RM}{–O(C6H3R′-3)CHN–NC(C6H5)O–}] (MGa, In; RMe, Et; R′H, OMe). These complexes have been characterized by elemental analysis, IR, UV-vis, and NMR (1H and 13C{1H}) spectroscopy. The molecular structures of [{MeGa}{–O(C6H4)CHN–NC(C6H5)O–}]2 (1), [{MeGa}{–O(C6H3–OMe)CHN–NC(C6H5)O–}]2 (2) and [{EtGa}{–O(C6H3–OMe)CHN–NC(C6H5)O–}]2 (6) were established by X-ray crystallography. These complexes adopt a dimeric structure with phenolate oxygen bridges with the gallium atom acquiring a distorted square pyramidal configuration. These complexes are emissive in toluene solution at room temperature.

Complexes of composition [{RM}{–O(C6H3R′-3)CHN–NC(C6H5)O–}] (MGa, In) were synthesized from reactions of triorgano-gallium and –indium etherates with benzohydrazide schiff bases. The complexes were emissive in toluene at room temperature. They adopt a dimeric structure with phenolate oxygen bridges. Gallium atom acquires a distorted square pyramidal configuration.Figure optionsDownload as PowerPoint slide