A new series of azo were derived from 2,5-di（p-amino phenyl）-3,6-diphenyl pyrazine in the presence of benzoic acid, salicylic acid, p-amino salicylic acid, p-methoxy phenol and pmethyl phenol. The structures of the ...A new series of azo were derived from 2,5-di（p-amino phenyl）-3,6-diphenyl pyrazine in the presence of benzoic acid, salicylic acid, p-amino salicylic acid, p-methoxy phenol and pmethyl phenol. The structures of the synthesized compounds were determined on the basis of their FTIR, UV （ultraviolet）, elemental analysis and H-NMR （H-nuclear magnetic resonance） spectral date. The purity of synthesized compounds was checked by performing TLC （thin layer chromatography）. The antibacterial activity was evaluated in DMSO （dimethyl sulfoxide）.展开更多
Reman spectroscopy is used as a tool to monitor the reaction between N,N'-di(pmethyl)monothioxamides and 1,3-diamine trimethylene and to detect the reaction intermediate. By observing changes of 1024 cm^(-1) C=S b...Reman spectroscopy is used as a tool to monitor the reaction between N,N'-di(pmethyl)monothioxamides and 1,3-diamine trimethylene and to detect the reaction intermediate. By observing changes of 1024 cm^(-1) C=S band and appearance of a new bend at around 1720 cm^(-1), the reaction mechanism is discussed.展开更多
在锶(钡) 二溴对甲偶氮甲磺显色体系中,应用 Kohonen神经网络优选波长,用遗传算法优化确定BP神经网络结构和参数,得到优化结构的网络,即 KNN GA BP ANN(29 3 3 2),学习速率η=0.233 3,动量因子α=0.974 7。用优化了的神经网络解析锶、...在锶(钡) 二溴对甲偶氮甲磺显色体系中,应用 Kohonen神经网络优选波长,用遗传算法优化确定BP神经网络结构和参数,得到优化结构的网络,即 KNN GA BP ANN(29 3 3 2),学习速率η=0.233 3,动量因子α=0.974 7。用优化了的神经网络解析锶、钡配合物的混合吸收光谱,不经分离光度法同时测定锶和钡。将BP ANN 、KNN BP ANN与KNN GA BP ANN三种神经网络方法的分析结果进行比较,表明 KNN GA BP ANN最优。锶和钡的配合物的表观摩尔吸光系数分别为εSr635=6.9×104L·mol-1·cm-1,εBa634=8.0×104L·mol-1·cm-1。展开更多
文摘A new series of azo were derived from 2,5-di（p-amino phenyl）-3,6-diphenyl pyrazine in the presence of benzoic acid, salicylic acid, p-amino salicylic acid, p-methoxy phenol and pmethyl phenol. The structures of the synthesized compounds were determined on the basis of their FTIR, UV （ultraviolet）, elemental analysis and H-NMR （H-nuclear magnetic resonance） spectral date. The purity of synthesized compounds was checked by performing TLC （thin layer chromatography）. The antibacterial activity was evaluated in DMSO （dimethyl sulfoxide）.
文摘Reman spectroscopy is used as a tool to monitor the reaction between N,N'-di(pmethyl)monothioxamides and 1,3-diamine trimethylene and to detect the reaction intermediate. By observing changes of 1024 cm^(-1) C=S band and appearance of a new bend at around 1720 cm^(-1), the reaction mechanism is discussed.
文摘在锶(钡) 二溴对甲偶氮甲磺显色体系中,应用 Kohonen神经网络优选波长,用遗传算法优化确定BP神经网络结构和参数,得到优化结构的网络,即 KNN GA BP ANN(29 3 3 2),学习速率η=0.233 3,动量因子α=0.974 7。用优化了的神经网络解析锶、钡配合物的混合吸收光谱,不经分离光度法同时测定锶和钡。将BP ANN 、KNN BP ANN与KNN GA BP ANN三种神经网络方法的分析结果进行比较,表明 KNN GA BP ANN最优。锶和钡的配合物的表观摩尔吸光系数分别为εSr635=6.9×104L·mol-1·cm-1,εBa634=8.0×104L·mol-1·cm-1。
