Mono(pyridine-N-oxide) analog of DOTA as a suitable organic reagent for a sensitive and selective fluorimetric determination of Ln(III) ions

► Quick, selective and sensitive determination of Eu3+/Tb3+ ions was developed. ► Sensitized emission with excitation at 286 nm through pyridine-N-oxide pendant arm. ► No interference of transition metal or other Ln(III) ions within high dynamic range.