Tổng hợp cảm biến huỳnh quang đáp ứng đa kích thích ứng dụng để xác định hàm lượng ion sắt (III) trong nước
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Abstract
Photo-switchable molecules have been recently utilized for many practical applications, especially for chemo-sensors. In this research, a smart fluorescent sensor SP-N3 was synthesized via simple reactions and its chemical structure was characterized by 1H, 13C-NMR and HR-MS spectra. Under Vis/UV light, the colorless and non-emissive close form of SP-N3 was reversibly photoisomerized to the colored and emissive open form of MC-N3. MC-N3 displayed multi-stimuli responsive optical behaviors under various conditions of solvents, UV/Vis lights, pH media, and metal ions. The red color and emission of MC-N3 were easily quenched by ferric ion interaction, which was utilized for Fe3+ detection in water with high selectivity and sensitivity (LOD = 1.683 and 0.690 mM) via UV-Vis and fluorescent techniques, respectively.
Tóm tắt
Các hợp chất biến đổi quang ngày càng được ứng dụng nhiều trong thực tế, đặc biệt là lĩnh vực cảm biến hóa học. Trong nghiên cứu này, một cảm biến huỳnh quang thông minh spiropyran azide (SP-N3) được tổng hợp bằng các phản ứng đơn giản và cấu trúc hóa học của hợp chất này được xác định bằng phổ 1H, 13C-NMR và HR-MS. Dưới ánh sáng Vis/UV, dạng đóng vòng SP-N3 không màu, không phát quang có khả năng đồng phân hóa thuận nghịch thành dạng mở vòng merocyanine azide (MC-N3) có màu và phát quang tốt. Hợp chất MC-N3 thể hiện khả năng đáp ứng quang đa kích thích dưới ảnh hưởng của dung môi, tia UV/Vis, pH của môi trường và ion kim loại. Màu và huỳnh quang của MC-N3 dễ dàng bị dập tắt khi tương tác với ion Fe3+, do đó cảm biến MC-N3 được ứng dụng để xác định hàm lượng Fe3+ trong nước bằng cả phương pháp UV-Vis và huỳnh quang với độ chọn lọc và độ nhạy cao (LOD = 1,683 và 0,690 mM).
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