Abstract
Two new La(III) and Sm(III) complexes with enrofloxacin (HER, 1-cyclopropyl-7-(4-ethyl-1-piperazinyl)-6-fluoro-1,4-dihydro-4-oxo-3-quinoline carboxylic acid, C19H21FN3O3), [La2(ER)6(H2O)2]·14H2O(1) and [Sm2(ER)6(H2O)2]·14H2O(2) have been synthesized and characterized by elemental analysis, FT-IR, TG-DTG and X-ray single crystal diffraction. Both of the complexes are triclinic system with space group Pī. The structure of the complexes show that each rare earth atom in both complexes was nine-coordinated. Two of the enrofloxacin ions acted as tridentate chelate and bridging ligands, while the others as bidentate chelate ligands. The binding reaction between the complexes and bovine serum albumin (BSA) was studied by UV-vis absorption spectra and fluorescence spectroscopy. The results indicated that the two complexes had a quite strong ability to quench the fluorescence from BSA and the binding reaction was mainly a static quenching process. The binding constants K A /(L·mol−1) were 1.46 × 105(1) and 8.59 × 106(2) and one binding site was formed. The synchronous spectroscopy suggested that tryptophan residues were placed in BSA. It was also found that the two complexes exhibited greater antimicrobial activity than enrofloxacin at given concentrations.
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This work received financial support from the Natural Science Foundation of Zhejiang Province, China (Grant No. Y407301).
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Wang, YJ., Hu, RD., Jiang, DH. et al. Synthesis, Crystal Structure, Interaction with BSA and Antibacterial Activity of La(III) and Sm(III) Complexes with Enrofloxacin. J Fluoresc 21, 813–823 (2011). https://doi.org/10.1007/s10895-010-0775-1
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DOI: https://doi.org/10.1007/s10895-010-0775-1