Spectroscopic study of cyclen-based 19 F NMR probe for detection of hydrogen sulfide

A cyclen-based F NMR probe (F-cyclen) for hydrogen sulfide (H S) has been prepared and evaluated for its complex formation ability with Cu ions and responsivity to H S. F-Cyclen was readily synthesized by reacting cyclen with 4-(trifluoromethyl)benzyl bromide. Visible absorption spectrophotometry sh...

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Bibliographic Details
Published in:Analytical sciences 2022-05, Vol.38 (5), p.813
Main Authors: Takegami, Shigehiko, Aramoto, Yuki, Konishi, Atsuko
Format: Article
Language:English
Subjects:
Cyclams
Hydrogen Sulfide
Magnetic Resonance Spectroscopy
Sodium
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Summary:A cyclen-based F NMR probe (F-cyclen) for hydrogen sulfide (H S) has been prepared and evaluated for its complex formation ability with Cu ions and responsivity to H S. 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 Na S (as H S 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 Na S concentration showed good linearity (r = 0.986) over the Na S concentration range of 25-150 μM.
ISSN:1348-2246