期刊
MICROCHIMICA ACTA
卷 184, 期 9, 页码 3363-3371出版社
SPRINGER WIEN
DOI: 10.1007/s00604-017-2306-0
关键词
Lanthanum-organic frameworks; Luminescence; Metal ions detection; Amino acids; Sensing
资金
- Swedish Research Council (VR)
- Swedish Governmental Agency for Innovation Systems (VINNOVA)
- MATsynCELL project through Rontgen-Angstrom Cluster, VR
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 (H(3)L2) 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 mu M Fe(III) concentration range, and Stern-Volmer plots are linear. The limit of detection (LOD) is 16.6 mu M (at an S/N ratio of >3). This indicator probe can also be used for selective detection of tryptophan among several amino acids. Compared to the free linker H(3)L2, SUMOF-7II offers improved sensitivity and selectivity of the investigated species.
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