The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《A simple fluorescent probe for selective detection of Al3+ based on furan Schiff base and its crystal structure》. Authors are Peng, Hua-nan; Liu, Yi-qing; Huang, Jia-qi; Huang, Shou-Shun; Cai, Xin-ping; Xu, Shu-juan; Huang, Ai; Zeng, Qiang; Xu, Miao.The article about the compound:2-Furoic hydrazidecas:3326-71-4,SMILESS:O=C(C1=CC=CO1)NN).Synthetic Route of C5H6N2O2. Through the article, more information about this compound (cas:3326-71-4) is conveyed.
A simple “”turn-on”” fluorescent probe L was synthesized by condensation of furan-2-carbohydrazide and 2-hydroxy-4-methoxybenzaldehyde, and its structure was confirmed by single crystal X-ray diffraction. The probe L exhibited excellent selectivity towards Al3+ over other coexistent metal ions with remarkable fluorescence enhancement, accompanied by color change from colorless to blue. Moreover, the probe L showed high sensitivity to Al3+ with low detection limit (3.10 x 10-8 M) in the pH range of 3.0-8.0. The possible sensing mechanisms of L toward Al3+ were determined by Job plots experiments, high resolution mass spectrometry (HRMS), 1H NMR spectra and the d. functional theory (DFT) calculations Addnl., the probe L was successfully applied for detection of Al3+ in water samples with satisfactory results.
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Reference:
Benzisoxazole – Wikipedia,
Benzisoxazole – an overview | ScienceDirect Topics