Exceptional Blueshifted and Enhanced Aggregation‐Induced Emission of Conjugated Asymmetric Triazines and Their Applications in Superamplified Detection of Explosives

A novel conjugated asymmetric donor–acceptor (CADA) strategy for preventing the redshift in photoluminescence, as well as preserving the merits of donor–acceptor architectures, was proposed and demonstrated for two triazine derivatives, which showed highly efficient, narrow, and blueshifted ultraviolet light emission in solid films along with special aggregation‐induced emission behavior. A mechanism of aggregation‐induced locally excited‐state emission by suppressing the twisted intramolecular charge‐transfer emission for the spectacular optoelectronic phenomena of these CADA molecules was suggested on the basis of both experimental measurements and theoretical calculations. By taking advantage of this special CADA architecture, fluorescent probes based on aggregates of conjugated asymmetric triazines in THF/water for the detection of explosives show superamplified detection of picric acid with high quenching constants (>1.0×10⁷ M ^?1) and a low detection limit of 15 ppb.     

地方文献与州市本科高校图书馆的特色化建设

地方文献特色化建设内容可以分为物质文化形态的地方文献资源、行为文化形态的地方文献建设和观念文化形态的地方文献理论.地方文献特色化发展的基本思路就是以文化层次结构理论审视地方文献系统,以组织形象设计理论指导地方文献建设,以地方文献的形象展示为落脚点推进学科建设和特色发展;其主要措施就是全面加强图书馆的馆藏资源建设、行为规范建设、文献理论建设和组织形象建设.     

1,3-二羟基呫吨酮类化合物的简洁合成及清除亚硝酸根作用研究

以间苯三酚为起始原料,在伊顿试剂的催化作用下,与不同取代水杨酸反应合成1,3-二羟基呫吨酮类化合物3a~3l 12个,收率63%~87%,并探讨了反应机理及结构-反应活性关系.利用紫外分光光度法测定了所合成化合物对亚硝酸盐的清除作用,结果表明,在37℃、pH 3及反应时间为30 min条件下,1,3-呫吨酮类化合物对亚硝酸根均有较好的清除作用,其中化合物3f和3b的清除作用最强,清除率达34%.同时对1,3-二羟基呫吨酮类化合物清除亚硝酸盐的作用机制及构效关系进行了探讨.     

The removal of H2S derived from livestock farm on activated carbon modified by combinatory method of high-pressure hydrothermal method and impregnation method

H₂S is considered as the main gas pollutant from livestock farm and activated carbon (AC) is widely used as adsorbent for H₂S. This paper focuses on the influence of modification conditions and operation conditions on the H₂S adsorption performance on AC samples. The H₂S adsorption performance on modified AC (MAC) samples by single and combinatory method has been investigated. It is concluded that the MAC by combinatory method of high-pressure hydrothermal method followed by alkaline solution impregnation method could promote the H₂S adsorption performance remarkably. The H₂S adsorption performance differs with different operation conditions. Meanwhile the samples of fresh AC and exhausted AC have been characterized using BET, FTIR, TPD and Boehm titration method. The experimental results are confirmed that the characteristics of AC have significant influence on the adsorption ability for H₂S.