Altering molecular polarity via assembly induced charge transfer for high selectivity detection of Cu2+

Altering molecular polarity via assembly induced charge transfer for high selectivity detection of Cu2+
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通过组装诱导电荷转移改变分子极性,实现 Cu2 的高选择性检测

DOI:
10.1016/j.colsurfa.2020.125658
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发表时间:
2021
期刊:
Colloids and Surfaces A
影响因子:
--
通讯作者:
Hongyao Xu
Hongyao Xu
中科院分区:
其他
文献类型:
--
作者:
Peng Sun;Kaibing Xu;Shanyi Guang;Hongyao Xu

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在这项工作中,组装诱导电荷转移的方法,改变分子的极性,以实现高选择性的Cu 2+检测提出。通过简单的分子组装将比色分子伊利石榴石(EG)组装到单层RGO(还原氧化石墨烯)表面。理论计算和实验结果表明,通过组装诱导的电荷转移,EG分子的极性发生了明显的改变,偶极矩从3.579D增加到29.552D.这种极性的变化提高了EG的螯合性能,即使在某些干扰离子(甚至是三价Fe 3+和Al 3+)的存在下,它也可以在复杂环境中选择性地检测Cu 2+,检测限低至0.98 μM。Cu ~(2+)的加标回收率为97.75%~ 100.8%,相对标准偏差≤ 4.8%。分别对组装机理、解聚效应、选择性检测和光学稳定性进行了研究。
In this work, a method of assembly-induced charge transfer for changing the polarity of molecules was proposed to achieve highly selective Cu2+detection. The colorimetric molecule Erie Garnet (EG) is assembled to the surface of single lay RGO (reduced graphene oxide) through simple molecular assembly. Theoretical calculations and experimental results show that through assembly-induced charge transfer, the polarity of the EG molecule is significantly altered, and the dipole moment increases from 3.579D to 29.552D. This change in polarity improves the chelating properties of EG, even in the presence of certain interfering ions (even trivalent Fe3+and Al3+), it can selectively sense Cu2+in complex environments with a detection limit as low as 0.98 μM. The recovery rate and relative standard deviation of Cu2+are 97.75 % ∼ 100.8 % and ≤4.8 %, respectively. The mechanism of assembly, deaggregation effect, selective detection and optical stability were investigated in detail, respectively.
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