Sensing Zn2+ in Aqueous Solution with a Fluorescent Scorpiand Macrocyclic Ligand Decorated with an Anthracene Bearing Tail

Sensing Zn2+ in Aqueous Solution with a Fluorescent Scorpiand Macrocyclic Ligand Decorated with an Anthracene Bearing Tail
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用带有蒽尾部修饰的荧光蝎形和大环配体检测水溶液中的 Zn2

DOI:
10.3390/molecules25061355
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发表时间:
2020
期刊:
影响因子:
4.6
通讯作者:
C. Bazzicalupi
C. Bazzicalupi
中科院分区:
化学2区
文献类型:
--
作者:
M. Savastano;M. Fiaschi;G. Ferraro;P. Gratteri;P. Mariani;A. Bianchi;C. Bazzicalupi

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本文报道了一种新的蝎形配体L的合成,它由一个带有CH_2CH_2NHCH_2-蒽尾的[9] aneN_3大环组成。L形成阳离子(Zn 2+)和阴离子(磷酸根、苯甲酸根)络合物。此外,L的锌络合物结合这些阴离子。在298.1 ± 0.1K的0.1MNaCl水溶液中,用电位滴定法测定了配体质子化和络合物形成的平衡常数。配体尾部与Zn 2+的pH受控配位/脱离打开和关闭来自蒽荧光团的荧光发射。因此,L能够在pH范围6-10下至nM浓度的金属离子中感测Zn 2+。L可以有效地检测Zn 2+,即使在存在大量过量的配位阴离子,如氰化物,硫化物,磷酸盐和苯甲酸盐,尽管他们的能力,结合的金属离子。
Synthesis of the new scorpiand ligand L composed of a [9]aneN3 macrocyclic ring bearing a CH2CH2NHCH2-anthracene tail is reported. L forms both cation (Zn2+) and anion (phosphate, benzoate) complexes. In addition, the zinc complexes of L bind these anions. The equilibrium constants for ligand protonation and complex formation were determined in 0.1 M NaCl aqueous solution at 298.1 ± 0.1 K by means of potentiometric (pH-metric) titrations. pH Controlled coordination/detachment of the ligand tail to Zn2+ switch on and off the fluorescence emission from the anthracene fluorophore. Accordingly, L is able to sense Zn2+ in the pH range 6–10 down to nM concentrations of the metal ion. L can efficiently sense Zn2+ even in the presence of large excess of coordinating anions, such as cyanide, sulphide, phosphate and benzoate, despite their ability to bind the metal ion.
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