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Studies on a new type of terbium complex with sulphonated catecholate. The molecular structure and fluorescence properties of [Tb 2 (C 6 H 3 S 2 O 8 ) 2 6DMF] n
Reaction of sulphonated catecholate Na 2 C 6 H 4 S 2 O 8 (Tiron) and terbium perchlorate with a 3 : 2 mole ratio in hot water resulted in the precipitation of crystalline Tb 2 (C 6 H 3 S 2 O 8 ) 2 5H 2 O (A) which was recrystallized in water-DMF mixed solvent to obtain the title complex Tb 2 (C 6 H 3 S 2 O 8 ) 2 6DMF (B). The X-ray crystal structure determination of B indicates that Tiron and terbium ion form a chain polymer with a 1 : 1 mole ratio. The unique structural unit is a dimer in which two terbium ions are bridged by one oxygen atom from a deprotonated hydroxyl group of Tiron. The distance between terbium ions is 3.385 . The terbium ion is eight-coordinated dodecahedral. The elemental analysis data and thermographic data show that compound B loses one DMF molecule in air to become Tb 2 (C 6 H 3 S 2 O 8 ) 2 5DMF (B ). The fluorescence spectra of A andB have been studied. BothA and B have the same maximum excitation wavelength (318 nm) at which the emission fluorescence intensity of B is 2.5 times that of A at 543 nm. The thermogravimetric analysis and IR spectra of A and B have been studied.