A cyclen-based F NMR probe (F-cyclen) for hydrogen sulfide (HS) has been prepared and evaluated for its complex formation ability with Cu ions and responsivity to HS. F-Cyclen was readily synthesized by reacting cyclen with 4-(trifluoromethyl)benzyl bromide. Visible absorption spectrophotometry showed that, same as the original cyclen, F-cyclen formed a 1:1 complex with Cu ions. The F NMR signal of F-cyclen at 16.5 ppm gradually decreased in intensity with increasing CuCl concentration, with trifluoromethane sulfonic acid sodium salt (TFMSNa) used as an internal standard (0 ppm). When the Cu-F-cyclen complex was subjected to an increasing concentration of NaS (as HS donor), its corresponding F NMR signal of F-cyclen at 16.5 ppm gradually increased in intensity. The regression curve between the F NMR signal intensity ratio of F-cyclen to TFMSNa and NaS concentration showed good linearity (r = 0.986) over the NaS concentration range of 25-150 μM.
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