Chinese Journal of Applied Chemistry ›› 2022, Vol. 39 ›› Issue (5): 787-796.DOI: 10.19894/j.issn.1000-0518.210147

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Synthesis of Isomers of Distinguishable Iron(Ⅲ) Fluorescent Probes and Application in Water Samples

Jing-Hui WEN1, Bing ZHAO1,2(), Wei KAN1,2, Li-Yan WANG1,2, Li SUN1, Tian-Shu SONG1, Bo SONG1,2   

  1. 1.College of Chemistry and Chemical Engineering,Qiqihar University,Qiqihar 161006,China
    2.Heilongjiang Provincial Key Laboratory of Surface Active Agent and Auxiliary,Qiqihar 161006,China
  • Received:2021-04-12 Accepted:2021-08-27 Published:2022-05-01 Online:2022-05-24
  • Contact: Bing ZHAO
  • About author:zhao_submit@aliyun.com
  • Supported by:
    the National Natural Science Foundation of China(21978140);the Natural Science Foundation of Heilongjiang Province(LC2017004);the Fundamental Research Funds in Heilongjiang Provincial Universities(YSTSXK201853);the Echelon Reserve Leader Fund for the Leading Talent of Heilongjiang Province(HLJLY2018008);Qiqihar University Graduate Innovation Fund Grants(YJSCX2019037)

Abstract:

Two isomeric phenanthro[9,10-d]imidazole-phenol derivatives (PI?o?OH and PI?m?OH) were synthesized by the reaction of isomeric 2-aminophenyl and 3-aminophenyl phenanthro[9,10-d]imidazole and 5-nitro salicylaldehyde. In the aqueous medium (V(DMF)∶V(HEPES) = 1∶1, pH = 7.4), fluorescent intensities for two isomers were observed and the fluorescence was quenched by the addition of Fe3+ with the quenching ratio of 1/3 and 1/6. The quenching effects are not disturbed by other metal ions and pH value with the quenching constants Ksv of 4.8×103 L/mol and 4.6×103 L/mol, respectively. Specially, PI?m?OH has the ability to respond to Fe3+ within 2 min, which is much quicker than that of PI?o?OH. Furthermore, the coordination constant Kass between PI?m?OH and Fe3+ is 3.82×104 L/mol and higher than that of PI?o?OH, which means that PI?m?OH has better stabilities of coordination with Fe3+. The complexation ratio between two compounds and Fe3+ is determined by HRMS and Job's curves, based on which the structures for PI?m?OH-Fe3+ and PI?o?OH-Fe3+ are proposed. Besides, both isomeric probes could quantitatively detect the concentration of Fe3+ in real water sample by the fluorescence method, indicating that they have potential application in analyzing Fe3+ .

Key words: Phenanthro[9,10-d]imidazole, Isomerization, Distinguishable recognition, Iron(Ⅲ), Real water sample, Complex ratio

CLC Number: