Ramesh Subbiah, Kumaresan Sudalaiyandi
Department of Chemistry, Manonmaniam Sundaranar University, Abishekapatti, Tirunelveli, 627012, Tamilnadu, India.
J Fluoresc. 2023 Jul;33(4):1469-1480. doi: 10.1007/s10895-023-03161-y. Epub 2023 Feb 9.
A coumarin-rhodamine (RhBC)-fused colorimetric/fluorescent probe was designed and synthesized. The probe is effective in Cu/Hg ion sensing. With the added Cu to RhBC in water: N, N-dimethyl formamide (8:2, v/v), the cyclic form of RhBC, is converted into the open ring form and shows a clear color change from yellow to red. In the presence of additional participating cations, this moiety shows effectiveness for Cu and Hg ions. The RhBC's detection limit by the UV-visible spectral method was 8.81 × 10 M for Cu ions and 2.26 × 10 M for Hg ions. The detection limit in the fluorescence titration spectra was 2.02 × 10 M for Cu ions and 6.11 × 10 M for Hg ions. A 1:1 stoichiometric ratio was validated between the probe and copper/mercury ions by the method of the job plot. Moreover, RhBC-combined polyurethane electrospun nanofibers were synthesized. These nanofibers could detect Cu in real samples with no complications, with an instinctive color difference from yellow to red and a weak orange color for mercury ions.
设计并合成了一种香豆素-罗丹明（RhBC）融合的比色/荧光探针。该探针对铜/汞离子传感有效。在水与N，N-二甲基甲酰胺（8:2，v/v）的混合体系中，向RhBC中加入铜后，RhBC的环状形式会转变为开环形式，并呈现出从黄色到红色的明显颜色变化。在存在其他参与的阳离子时，该部分对铜离子和汞离子显示出有效性。通过紫外-可见光谱法测得RhBC对铜离子的检测限为8.81×10⁻⁶ M，对汞离子的检测限为2.26×10⁻⁶ M。荧光滴定光谱中的检测限对铜离子为2.02×10⁻⁶ M，对汞离子为6.11×10⁻⁶ M。通过工作曲线法验证了探针与铜/汞离子之间的化学计量比为1:1。此外，还合成了RhBC复合的聚氨酯电纺纳米纤维。这些纳米纤维能够在实际样品中无复杂情况地检测铜，从黄色到红色有直观的颜色差异，对汞离子则呈现微弱的橙色。
