Abstract
A 12-metal Zn(II)-Nd(III) cluster 1 (sizes: 1.8 nm × 2.0 nm × 2.0 nm) was synthesized from a long-chain type Schiff base ligand. It displays ratiometric fluorescence response to neopterin (Neo) with high selectivity and sensitivity, which can be expressed by the equation I545 nm /I1060 nm = A·[Neo]2 + B·[Neo] + C. 1 is used to quantitatively test Neo concentrations in fetal calf serum (FCS) and urine, and the recovery ranges are 98.57%–103.82% and 99.25%–103.50%, respectively, while the relative standard deviations (RSDs) are 7.89%–9.46% and 1.85%–4.16%, respectively. The limits of detection of 1 to Neo in FCS and urine are 0.034 and 0.021 μmol/L, respectively.
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