化学
腙
质子核磁共振
滴定法
荧光
螯合作用
离子
分析化学(期刊)
齿合度
检出限
水溶液中的金属离子
配体(生物化学)
锌
定性无机分析
转身(生物化学)
结晶学
无机化学
晶体结构
立体化学
色谱法
有机化学
生物化学
物理
受体
量子力学
作者
Sandeep Kumar,Satyajit Mahata,V. Manivannan
标识
DOI:10.1016/j.jphotochem.2023.115436
摘要
A polydentate chelating ligand (LH) was synthesized from 4-tertbutyl-2,6-diformylphenol and 3-hydrazineylquinoxalin-2(1H)-one and was characterized by mass spectrometry, IR and NMR spectroscopy. LH is weakly fluorescent in EtOH – HEPES buffer (5 mM, pH = 7.4, 8:2, v/v) but exhibited a turn on response with Zn2+ ion having a workable pH range of 6–12 and thus is compatible with biological pH. This sensor is selective for Zn2+ ion, over various metal ions and anions as evident from competition experiments. The probable mechanism of sensing by LH is restriction of ESIPT, PET and C = N isomerization processes and on-set of CHEF process upon coordination to Zn(II) ion. Reversibility was established using EDTA test and applicability in various real samples were evaluated. The calculated limit of detection for Zn2+ ion was 95 nM and Job plot as well as 1H NMR titration suggested a 2:1 binding ratio between Zn2+ ion and LH. From the reaction (in ethanol) of ZnCl2 with LH, in 2:1 ratio, crystalline solids of composition [Zn2(L)Cl3]⋅2H2O 2.5DMF was isolated and its molecular structure was established by single crystal XRD studies. DFT/TDDFT calculation supported the experimental absorption spectrum.
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