A.E. Arbuzov Institute of Organic and Physical Chemistry, Arbuzov Street 8, Kazan, Russia.
Chemphyschem. 2012 Oct 8;13(14):3357-64. doi: 10.1002/cphc.201200367. Epub 2012 Jul 4.
The complex formation of d-metal ions at the interface of Tb(III)-doped silica nanoparticles modified by amino groups is introduced as a route to sensing d-metal ions and some organic molecules. Diverse modes of surface modification (covalent and noncovalent) are used to fix amino groups onto the silica surface. The interfacial binding of d-metal ions and complexes is the reason for the Tb(III)-centered luminescence quenching. The regularities and mechanisms of quenching are estimated for the series of d-metal ions and their complexes with chelating ligands. The obtained results reveal the interfacial binding of Cu(II) ions as the basis of their quantitative determination in the concentration range 0.1-2.5 μM by means of steady-state and time-resolved fluorescence measurements. The variation of chelating ligands results in a significant effect on the quenching regularities due to diverse binding modes (inner or outer sphere) between amino groups at the interface of nanoparticles and Fe(III) ions. The applicability of the steady-state and time-resolved fluorescence measurements to sense both Fe(III) ions and catechols in aqueous solution by means of Tb(III)-doped silica nanoparticles is also introduced.
将 d-金属离子在氨基修饰的 Tb(III)掺杂二氧化硅纳米粒子界面上的配合物形成作为一种用于感测 d-金属离子和一些有机分子的方法进行介绍。采用多种表面修饰方式（共价和非共价）将氨基固定在二氧化硅表面。d-金属离子和配合物的界面结合是 Tb(III)中心发光猝灭的原因。对一系列 d-金属离子及其与螯合配体的配合物进行了猝灭规律和机制的估计。获得的结果表明，Cu(II)离子的界面结合是通过稳态和时间分辨荧光测量在 0.1-2.5 μM 浓度范围内定量测定 Cu(II)离子的基础。由于纳米粒子界面上的氨基与 Fe(III)离子之间的不同结合模式（内球或外球），螯合配体的变化导致猝灭规律发生显著变化。还介绍了通过 Tb(III)掺杂二氧化硅纳米粒子的稳态和时间分辨荧光测量在水溶液中感测 Fe(III)离子和儿茶酚的适用性。
