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Abstract
The reactions of Al(III), Ga(III) and In(III) nitrates with 2-quinaldic acid (qaH) afforded [Al2(OH)2(qa)4]·2H2O (1), [Ga(qa)2(H2O)2]NO3 (2) and [In(qa)2(NO3)(H2O)] (3), respectively, in high yields. The crystal structures of 1, 2 and 3 have been determined by single-crystal X-ray crystallography. The structure of 1 features a di-hydroxo bridged [Al2(μ-OH)2]4+ dimer in which each Al(III) is further ligated by two bidentate chelate qa− ligands. Complexes 2 and 3 are mononuclear with the M(III) ions in octahedral environments surrounded by two bidentate chelate qa− and two H2O in 2 or one H2O and a terminal NO3− in 3. Characteristic IR as well as thermal analysis and solid-state fluorescence are discussed.
Acknowledgements
The Special Account for Research Grants (SARG) of the National and Kapodistrian University of Athens (UoA) is gratefully acknowledged for partial support of this work. We also thank the Bodossaki Foundation for donating the TGA to UoA.