Mononuclear and dinuclear indium(III) complexes containing methoxy and hydroxy-bridge groups, nitrate anion and 4,4′-dimethyl-2,2′-bipyridine ligand: Synthesis, characterization, crystal structure determination, luminescent properties, and thermal...

چکیده مقاله

[In(4,4′-dmbipy)(η²-NO₃)₂(η-NO₃)(H₂O)] complex (1) and [{In(4,4′-dmbipy)(η²-NO₃)₂}₂(μ-OCH₃)₂] complex (2) (4,4′-dmbipy is 4,4′-dimethyl-2,2′-bipyridine) were prepared from the reaction of In(NO₃)₃·4H₂O with 4,4′-dmbipy in CH₃CN and CH₃OH, respectively. [{In(4,4′-dmbipy)(η²-NO₃)(η-NO₃)}₂(μ-OH)₂] complex (3) was also prepared fromthe reaction of InCl₃·4H₂O with 4,4′-dmbipy in mixture of CH₃CN/H₂O in 3:1 ratio. These complexes were characterized by elemental analysis, IR, ¹H NMR, ¹³C{¹H}NMR, UV-Vis, and luminescence spectroscopy and their structureswere studied by single-crystal X-ray diffraction method. Compound 1 is an eight-coordinated mononuclear complex, compound 2 is an eight-coordinated centrosymmetric dinuclear complex with two methoxy-bridges, and compound 3 is a seven-coordinated C₂-symmetric dinuclear complex with two hydroxy-bridges. Also, the thermal stabilities of 1-3 were studied by thermogravimetric (TG) and differential thermal analyses (DTA). © Iranian Chemical Society 2014.