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- 저자 : Shi Chunyan (검색결과 3 건)
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Shi, Xueliang,Lee, Sangsu,Son, Minjung,Zheng, Bin,Chang, Jingjing,Jing, Linzhi,Huang, Kuo-Wei,Kim, Dongho,Chi, Chunyan The Royal Society of Chemistry 2015 Chemical communications Vol.51 No.67
<P>A pro-aromatic bisphenaleno-thieno[3,2-b]thiophene (BPT-TIPS) was synthesized and compared with an anti-aromatic bisindeno-thieno[3,2-b]thiophene (S2-TIPS). BPT-TIPS showed larger diradical character, stronger absorption, longer excited state lifetime and better redox amphotericity than S2-TIPS.</P>
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Shi, Xueliang,Quintero, Estefaní,a,Lee, Sangsu,Jing, Linzhi,Herng, Tun Seng,Zheng, Bin,Huang, Kuo-Wei,Ló,pez Navarrete, Juan T.,Ding, Jun,Kim, Dongho,Casado, Juan,Chi, Chunyan Royal Society of Chemistry 2016 Chemical Science Vol.7 No.5
<▼1><P>Pro-aromatic <B>Th<I>n</I>-TIPS</B> exhibits distinctly different physical properties from anti-aromatic <B>S<I>n</I>-TIPS</B>.</P></▼1><▼2><P>Open-shell singlet diradicaloids have recently received much attention due to their unique optical, electronic and magnetic properties and promising applications in materials science. Among various diradicaloids, quinoidal π-conjugated molecules have become the prevailing design. However, the need for a fundamental understanding on how the fusion mode and pro-aromaticity/anti-aromaticity affect their diradical character and physical properties remains unaddressed. In this work, a series of pro-aromatic benzo-thia-fused [<I>n</I>]thienoacenequinodimethanes (<B>Th<I>n</I>-TIPS</B> (<I>n</I> = 1–3) and <B>BDTh-TIPS</B>) were synthesized and compared with the previously reported anti-aromatic bisindeno-[<I>n</I>]thienoacenes (<B>S<I>n</I>-TIPS</B>, <I>n</I> = 1–4). The ground-state geometric and electronic structures of these new quinoidal molecules were systematically investigated by X-ray crystallographic analysis, variable temperature NMR, ESR, SQUID, Raman, and electronic absorption spectroscopy, assisted by DFT calculations. It was found that the diradical character index (<I>y</I><SUB>0</SUB>) increased from nearly zero for <B>Th1-TIPS</B> to 2.4% for <B>Th2-TIPS</B>, 18.2% for <B>Th3-TIPS</B>, and 38.2% for <B>BDTh-TIPS</B>, due to the enhanced aromatic stabilization. Consequently, with the extension of molecular size, the one-photon absorption spectra are gradually red-shifted, the two-photon absorption (TPA) cross section values increase, and the singlet excited state lifetimes decrease. By comparison with the corresponding anti-aromatic analogues <B>S<I>n</I>-TIPS</B> (<I>n</I> = 1–3), the pro-aromatic <B>Th<I>n</I>-TIPS</B> (<I>n</I> = 1–3) exhibit larger diradical character, longer singlet excited state lifetime and larger TPA cross section value. At the same time, they display distinctively different electronic absorption spectra and improved electrochemical amphotericity. Spectroelectrochemical studies revealed a good linear relationship between the optical energy gaps and the molecular length in the neutral, radical cationic and dicationic forms. Our research work discloses a significant difference between the pro-aromatic and anti-aromatic quinoidal compounds and provides guidance for the design of new diradicaloids with desirable properties.</P></▼2>
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Wang Xiaoling,Shi Chunyan,Pan Wenbo,Lu Hai,Zhang Xiaoyu 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.7
Anaerobic/anoxia sequencing batch reactor (A/ASBR) system was used to analyze the quantity and composition of each branch of phosphorus accumulating organisms (PAOs) in activated sludge under different nitrate-nitrogen (NO 3 − -N) concentrations by using real-time quantitative polymerase chain reaction (PCR) technology. The study determined whether NO 3 − -N and its concentration change were the main driving factors for the variation of the quantity and composition of each branch of PAOs. The results show that with the increase of NO 3 − -N concentration from 10 mg/L to 40 mg/L, the number of bacterial 16S rRNA genes in the A/ASBR reactor changed slightly at 6.81×1011–7.53×1011 copies/g dry sludge. The number of PAO genes (Acc 16S rRNA) increased from 1.98×1011 to 3.53×1011 copies/g dry sludge, and the total number of ppk1 genes increased from 1.25×1011 to 3.59×1011 copies/g dry sludge. Additionally, the number of polyphosphate kinase (ppk) genes in Accumulibacter branch IA, IIC and IID was high, and the changes were positively related to the concentration of NO 3 − -N, while the number of branches in IIA, IIB and IIF was very low. The dosing concentration of NO 3 − -N was the main driving factor for the change of PAOs and their branch number and composition in the A/ASBR reactor.
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