Probes based on luminescence metal–organic frameworks (LMOFs) have been extensively investigated. Although many of the probes can detect multiple analytes individually, it has not been reported that the probes can detect the total content of multiple analytes simultaneously. Herein a series of isostructural MOFs ([MgMn(L)(DMSO)]) were constructed via a strategy utilizing paramagnetic/diamagnetic heterometallic probes, which can be used for detecting Ca/Sr individually or simultaneously without discrimination through a structural transformation mechanism. In-depth investigations reveal that probes involving such mechanism possess distinct advantages in total content detection, and one noteworthy characteristic of the probes is they exhibit similar working curves for different detectable analytes. By adjusting the ratio of paramagnetic/diamagnetic metal ions in the probes, their detection performance indicators can be precisely regulated. This work not only develops a new strategy for the customization of probe with specific performance indicators, but also opens up fresh opportunities to construct probes for total content detection.

中文翻译：

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基于MOF的Ca2+/Sr2+总含量检测探针——通过“顺磁/反磁异金属探针”策略调控探针检测性能指标

基于发光金属有机框架（LMOF）的探针已被广泛研究。虽然许多探针可以单独检测多种分析物，但尚未报道探针可以同时检测多种分析物的总含量。本文通过利用顺磁性/抗磁性异金属探针的策略构建了一系列同结构MOF（[MgMn(L)(DMSO)]），这些探针可用于单独或同时检测Ca/Sr，而无需通过结构转换机制进行区分。深入的研究表明，涉及这种机制的探针在总含量检测中具有明显的优势，并且探针的一个值得注意的特点是它们对不同的可检测分析物表现出相似的工作曲线。通过调节探针中顺磁性/反磁性金属离子的比例，可以精确调控其检测性能指标。这项工作不仅开发了一种定制具有特定性能指标的探针的新策略，而且为构建用于总含量检测的探针开辟了新的机会。