A new multiple-ion-responsive chemosensor was developed for the selective and differential detection of Hg²⁺ and Cu²⁺, based on the completely different ions recognition behaviors of the single rhodamine hydrazone-type probe in the absence and presence of UV irradiation. The probe was synthesized through simple chemical linkages of rhodamine B hydrazide, 4-hydroxybenzaldehyde, and acryloyl group. In the absence of UV irradiation, this probe could selectively sense Hg²⁺ in the presence of other metal ions by colorimetric and fluorescent responses with considerably high sensitivity (limit of detection: 7.1 × 10⁻⁸ M), and the process could be monitored directly by the naked eye. Intriguingly, when adding various metal ions to the probe solution under UV irradiation, only the Cu²⁺ ion, even at a concentration of 1.5 × 10⁻⁷ M, was found to induce a significant photochromism along with distinct color change. Benefiting from the high selectivity and sensitivity of such a photochromism, a convenient colorimetric sensing method for detection of Cu²⁺ in presence of UV irradiation was also established. Furthermore, we demonstrated that the interference of Hg²⁺ on Cu²⁺ could be easily eliminated by employing Br⁻ as a masking agent, and subsequently the discrimination of Hg²⁺ and Cu²⁺ under their coexistence was achieved.

基于在不存在和存在紫外线的情况下，若丹明amine型探针的完全不同的离子识别行为，开发了一种用于选择性和差异检测Hg ²⁺和Cu ²⁺的新型多离子响应化学传感器。该探针是通过罗丹明B酰肼，4-羟基苯甲醛和丙烯酰基的简单化学键合成的。在没有紫外线照射的情况下，该探针可以通过比色和荧光响应以相当高的灵敏度选择性地检测其他金属离子存在下的Hg ²⁺（检测限：7.1×10 ^-8 M），并且可以通过肉眼直接监视该过程。有趣的是，当在紫外线照射下向探针溶液中添加各种金属离子时，即使浓度为1.5×10 ^-7  M，也只有Cu ²⁺离子会引起显着的光致变色现象以及明显的颜色变化。得益于这种光致变色的高选择性和灵敏度，还建立了用于在紫外线照射下检测Cu ²⁺的方便的比色传感方法。此外，我们证明了汞的干扰²⁺对Cu ²⁺可以通过采用溴易于消除^-作为掩蔽剂，和Hg的随后的鉴别²⁺并在它们共存的条件下获得了Cu ²⁺。