Incorporation of triazole into a quinoline-rhodamine conjugate imparts iron(iii) selective complexation permitting detection at nanomolar levels
作者:Narendra Reddy Chereddy、Sathiah Thennarasu、Asit Baran Mandal
DOI:10.1039/c2dt31316b
日期:——
Two new rhodamine based probes 1 and 2 for the detection of Fe3+ were synthesized and their selectivity towards Fe3+ ions in the presence of other competitive metal ions tested. The probe 1 formed a coloured complex with Fe3+ as well as Cu2+ ions and revealed the lack of adequate number of coordination sites for selective complexation with Fe3+. Incorporation of a triazole unit to the chelating moiety of 1 resulted in the probe 2, that displayed Fe3+ selective complex formation even in the presence of other competitive metal ions like Li+, Na+, K+, Cu2+, Mg2+, Ca2+, Sr2+, Cr3+, Mn2+, Fe2+, Co2+, Ni2+, Zn2+, Cd2+, Hg2+ and Pb2+. The observed limit of detection of Fe3+ ions (5 × 10−8 M) confirmed the very high sensitivity of 2. The excellent stability of 2 in physiological pH conditions, non-interference of amino acids, blood serum and bovine serum albumin (BSA) in the detection process, and the remarkable selectivity for Fe3+ ions permitted the use of 2 in the imaging of live fibroblast cells treated with Fe3+ ions.
合成了两种用于检测 Fe3+ 的新型罗丹明探针 1 和 2,并测试了它们在存在其他竞争性金属离子的情况下对 Fe3+ 离子的选择性。探针 1 与 Fe3+ 以及 Cu2+ 离子形成有色络合物,并表明缺乏足够数量的配位位点来与 Fe3+ 选择性络合。将三唑单元掺入 1 的螯合部分产生探针 2,即使在存在其他竞争性金属离子(如 Li+、Na+、K+、Cu2+、Mg2+、Ca2+、Sr2+、Cr3+、Mn2+)的情况下,该探针也能选择性地形成 Fe3+ 络合物。 、Fe2+、Co2+、Ni2+、Zn2+、Cd2+、Hg2+ 和 Pb2+。观察到的 Fe3+ 离子检测限 (5 × 10−8 M) 证实了 2 具有极高的灵敏度。2 在生理 pH 条件下具有出色的稳定性,不受氨基酸、血清和牛血清白蛋白 (BSA) 的干扰在检测过程中,对 Fe3+ 离子的显着选择性使得 2 可用于对经 Fe3+ 离子处理的活成纤维细胞进行成像。