Inorganic and Structural Chemistry and Berzelii Center EXSELENT on Porous Materials, Department of Materials and Environmental Chemistry, Stockholm University, -106 91 Stockholm, SE Sweden.
Department of Organic Chemistry and Berzelii Center EXSELENT on Porous Materials, Stockholm University, -10691 Stockholm, SE Sweden.
Mikrochim Acta. 2017;184(9):3363-3371. doi: 10.1007/s00604-017-2306-0. Epub 2017 Jun 13.
The preparation of a highly water stable and porous lanthanide metal-organic framework (MOF) nanoparticles (denoted SUMOF-7II; SU refers to Stockholm University) is described. SUMOF-7II was synthesized starting from the tritopic linker of 2,4,6-tri-p-carboxyphenyl pyridine (HL2) and La(III) as metal clusters. SUMOF-7II forms a stable dispersion and displays high fluorescence emission with small variation over the pH range of 6 to 12. Its fluorescence is selectively quenched by Fe(III) ions compared to other metal ions. The intensity of the fluorescene emission drops drops linearly in 16.6-167 μM Fe(III) concentration range, and Stern-Volmer plots are linear. The limit of detection (LOD) is 16.6 μM (at an S/ ratio of >3). This indicator probe can also be used for selective detection of tryptophan among several amino acids. Compared to the free linker HL2, SUMOF-7II offers improved sensitivity and selectivity of the investigated species. Graphical abstractA water-stable porous lanthanide metal-organic framework SUMOF-7II (La) has shown to be an excellent probe for the detection of ferric ions among other metal ions, and tryptophan among other amino acids in aqueous solution. The new probe displays high and stable fluorescence signal in a wide pH range (6-12).
一种高水稳定性和多孔镧系金属-有机骨架（MOF）纳米粒子（表示为 SUMOF-7II；SU 指斯德哥尔摩大学）的制备方法。SUMOF-7II 是从三齿连接体 2,4,6-三对羧基苯基吡啶（HL2）和 La（III）作为金属簇开始合成的。SUMOF-7II 形成稳定的分散体，并显示出高荧光发射，在 pH 值为 6 到 12 的范围内变化很小。与其他金属离子相比，其荧光被 Fe（III）离子选择性猝灭。在 16.6-167 μM Fe（III）浓度范围内，荧光发射强度呈线性下降，且 Stern-Volmer 图呈线性。检测限（LOD）为 16.6 μM（S/N 比>3）。该指示剂探针还可用于在几种氨基酸中选择性检测色氨酸。与游离配体 HL2 相比，SUMOF-7II 提高了被研究物质的灵敏度和选择性。摘要一种水稳定的多孔镧系金属-有机骨架 SUMOF-7II（La）被证明是一种在水溶液中检测铁离子的优良探针，也可以检测其他氨基酸中的色氨酸。新探针在很宽的 pH 值范围内（6-12）显示出高且稳定的荧光信号。
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