| 光谱学与光谱分析 |
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| Derivative Fluorescence Probe Recognition Results of the Light Physical Mechanism of Metal Ions |
| DAI Yu-mei1, HU Xiao-jun2*, LI Fu-jun2, XIE Yu-meng1, ZHAO Yang-yang1, ZHOU Qiao1 |
1. Normal College, Shenyang University, Shenyang 110044, China
2. Key Lab of Regional Environment and Eco-Remediation, Ministry of Education, Shenyang University, Shenyang 110044, China |
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Abstract As people deeply study the electronic spectra of fluorescent compounds and photophysical behavior, enormous progress has been made in the aspect of changes and states of different systems in the use of fluorescent molecules as probes. PTCDA is a kind of typical fluorescent molecular probe that is highly sensitive and selective in water environment. This paper makes a research on the physical mechanism of light of PTCDA by TDF (Density Functional Theory), calculates the optimal configuration the charge population and excitation spectra of PTCDA molecules under ideal condition and acquires PTCDA fluorescence emission spectra then analyses that PTCDA is a kind of quenching and dual colorimetric signal probe response. Its optical signal response mechanism belongs to ICT( Intramolecular Charge Transfer) mechanism. According to the results, this perylene derivatives is fitted with Cu2+ excited state absorption spectra. Before and after the combination with Cu2+, the peak shape of absorption spectrum is similar. When copper is added, the overall absorption peak position occurred redshift, quenching discoloration happens. By comparing with experimental values, the calculated molecular configuration is reasonable and effective and the peak of excitation spectra is realistic. Analysis shows that: PTCDA molecules divalent copper ions have better fluorescence detection activity, the optical signal response mechanisms are intramolecular charge transfer (ICT) mechanisms. When a molecule receives divalent copper ions, the absorption spectrum peak position redshifts, intramolecular charge transfer direction and intensity changes. There occur both quenching signal and discoloration signal. It is a kind of fluorescent probe material with double quenching and discoloration fluorescent signal, which has great potential for development. This paper makes an early-stage exploration of the physical mechanism of light response mechanism analysis in molecular fluorescent probe field and can be a systematically valuable theoretical reference for this field.
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Received: 2013-12-15
Accepted: 2014-03-24
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Corresponding Authors:
HU Xiao-jun
E-mail: hu-xj@mail.tsinghua.edu.cn
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