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EPR sensing of metal and organic cations using a novel spin-labelled dibenzo-24-crown-8-ether.

Physical chemistry chemical physics : PCCP (2018-09-20)
Lorenzo Gualandi, Paola Franchi, Alberto Credi, Elisabetta Mezzina, Marco Lucarini
ABSTRACT

The synthesis of novel dibenzo-24-crown ether substituted nitroxides and their use as spin probes for the detection of cation guests by EPR are reported. Formation of a host-guest complex between the proposed spin probes and several cations, both organic and inorganic, was evidenced by a significant change in the value of the benzylic and nitrogen EPR hyperfine splittings upon complexation. This favorable feature provided a reliable EPR sensor that is able to selectively distinguish different cationic guests.

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Sigma-Aldrich
3-Chloroperbenzoic acid, ≤77%