For fluoro-quinolone carboxylic acid derivatives, one bond carbon-fluorine coupling constants are ranged from 249 §Ô to 257 §Ô regardless of positions. But geminal and vicinal carbon-fluorine coupling constants vary according to positions, namely, geminal coupling constants are ranged from 6 §Ô to 23 §Ô, and vicinal coupling constants are ranged from 1.9 §Ô to 7 §Ô. In cases of proton-fluorine couplings, three bond coupling constants are ranged from 9 §Ô to 10.3 §Ô, and four bond coupling constants ate ranged from 6 §Ô to 8.3 §Ô.
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