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LiXi Zeng YuJian He ZhiFeng Dai Jian Wang CaiQi Wang YongGang Yang 《中国科学B辑(英文版)》2009,52(8):1227-1234
Supramolecular chirality and molecular self-assembly are important and interesting phenomena in living and non-living systems.In this work,supramolecular chirality of achiral pseudoisocyanine(PIC) J-aggregates was successfully induced by D-,L-phenylalanine(Phe) and other amino acids in NaCl solution.The chiral J-aggregates showed a characteristic,induced circular dichroism(ICD) in the visible region of J-band chromophore which depends on the absolute configuration,concentration and side groups of α-amino ac... 相似文献
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D-,L-苯丙氨酸诱导非手性菁染料的手性组装 总被引:1,自引:0,他引:1
超分子手性与分子自组装是生命体中非常重要和有趣的现象.报道了D,L-苯丙氨酸等氨基酸在氯化钠溶液中通过非共价键相互作用诱导非手性菁染料(Pseudoisocyanine,PIC)J-聚集体超分子手性的形成.实验结果表明,诱导的手性菁染料PIC聚集体发色团在π-π^*跃迁区域产生了特征的镜像圆二色性,其圆二色信号和强度强烈地依赖于氨基酸的绝对构型、浓度、侧链基团和溶液温度.原子力显微镜照片清楚地表明,^聚集体由相互交联的纳米纤维组成,诱导的圆二色性可能来源于纤维状聚集体的宏观螺旋排列. 相似文献
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In this essay, some discussions and comments about the paper entitled “Can the decay rate of 32P be changed by mechanic motion?” (Ding et al., Science in China Series B: Chemistry (Chinese version), 2008, 38(11):1035–1037)
are given. It was strongly suggested that its experimental methods, data calculations and conclusion should be reconsidered.
After the data were recalculated, the new results supported that the chiral mechanic motion could induce the changes of radioactive
half life.
Supported by the National Natural Science Foundation of China (Grant Nos. 20571085, and 20877099), Fund of the President of
Chinese Academy of Sciences (Grant No. 0521021T04), 2005/2006 USA Li’s Foundation Merit Prize Fund, Fund of Graduate University
of Chinese Academy of Sciences (Grant No. 065101HM03), and Fund of the Key Laboratory of Nuclear Analysis of the Institute
of High Energy Physics of Chinese Academy of Sciences (Grant No. K129) 相似文献
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Jun bo Zhong Jian zhang LiXi yang He Jun ZengYan Lu Wei HuKun Lin 《Current Applied Physics》2012,12(3):998-1001
ZnO and Pd-doped ZnO photocatalysts with different molar ratio of Pd/Zn (1/100, 2/100, 3/100 and 4/100) were prepared by a sol-gel method. The photocatalysts prepared were characterized by BET surface area, X-ray diffraction (XRD), UV/vis diffuse reflectance (DRS) and surface photovoltage spectroscopy (SPS), respectively. The results show that doping Pd into ZnO decreases the BET surface area. The XRD spectra of the Pd-doped ZnO catalysts calcined at 773 K show only the characteristic peaks of wurtzite-type. Doping Pd into ZnO increases the absorbance of ZnO in visible region and enhances the photoinduced charge separation rate. The photocatalytic activity of Pd-doped ZnO photocatalysts for decolorization of methyl orange (MO) solution was evaluated, of all the photocatalysts prepared, the Pd-doped ZnO with 3/100 possesses the best photocatalytic activity. The results of further experiments show that increased adsorption ability of light and high separation rate of photoinduced charge carriers all play an important role in promotion of photocatalytic activity of Pd-doped ZnO nanostructure. 相似文献
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