A smart "off-on" gate for the in situ detection of hydrogen sulphide with Cu(ii)-assisted europium emission.

ABSTRACT: A water-soluble and emissive Eu-complex (EuL1) bearing a DO3A(Eu³⁺)-pyridine-aza-crown motif has been prepared and its Cu²⁺ complex has been demonstrated to be a smart luminescence "off-on" gate for H₂S detection in water with a nano-molar detection limit (60 nM). EuL1 binds to Cu²⁺ ions selectively (K_B = 1.2 × 10⁵ M^-1) inducing 17-fold luminescence quenching and forming a 1 : 1 stoichiometric complex (EuL1-Cu²⁺), which responds to H₂S selectively with restoration of the original Eu emission of EuL1 followed by a further 40-fold luminescence enhancement, forming a 1 : 1 stoichiometric complex (EuL1-Na₂S, K_B = 1.5 × 10

SUBMITTER: Liang Z 

PROVIDER: S-EPMC5968757 | biostudies-literature | 2016 Mar

REPOSITORIES: biostudies-literature