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

A smart "off-on" gate for the in situ detection of hydrogen sulphide with Cu(ii)-assisted europium emission.
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用于通过 Cu(II) 辅助铕发射原位检测硫化氢的智能“关-开”门

DOI:
10.1039/c5sc04091d
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发表时间:
2016-03-01
期刊:
影响因子:
8.4
通讯作者:
Wong KL
Wong KL
中科院分区:
化学1区
文献类型:
--
作者:
Liang Z;Tsoi TH;Chan CF;Dai L;Wu Y;Du G;Zhu L;Lee CS;Wong WT;Law GL;Wong KL

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开发了一种新型的响应性铕基发光“关 - 开”型传感器,用于原位检测水中的硫化氢。 制备了一种带有DO3A(Eu³⁺) - 吡啶 - 氮杂冠醚结构的水溶性发光铕配合物(EuL1),并且已证明其铜(Ⅱ)配合物是一种灵敏的发光“关 - 开”型传感器,可用于检测水中的硫化氢,检测限达纳摩尔级(60 nM)。EuL1选择性地与铜离子结合(结合常数KB = 1.2×10⁵ M⁻¹),导致17倍的发光猝灭,并形成化学计量比为1:1的配合物(EuL1 - Cu²⁺),该配合物对硫化氢具有选择性响应,恢复EuL1最初的铕发射,随后发光强度进一步增强40倍,形成化学计量比为1:1的配合物(EuL1 - Na₂S,结合常数KB = 1.5×10⁴ M⁻¹)。在没有铜离子的情况下,EuL1对硫化氢表现出非特异性结合,仅产生5倍的发光增强。
A novel responsive europium-based luminescence “off–on” gate for the in situ detection of H2S in water was developed. 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 (KB = 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, KB = 1.5 × 104 M–1). Without Cu2+ ions, EuL1 showed non-specific binding towards H2S with only a 5-fold luminescence enhancement.
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