构建了基于分子三维结构计算的原子电负性距离矢量(atomic electronegative space distance vector,AESDV),用以描述各芳香醚类化合物分子中不同等价碳原子的化学微环境,并结合原子自身杂化状态指数(AHSI),建立了^(13)C核磁共振定量结...构建了基于分子三维结构计算的原子电负性距离矢量(atomic electronegative space distance vector,AESDV),用以描述各芳香醚类化合物分子中不同等价碳原子的化学微环境,并结合原子自身杂化状态指数(AHSI),建立了^(13)C核磁共振定量结构波谱关系的多元线性回归模型,复相关系数(R)为0.964,标准误差(SD)为8.673.经留一法交互检验的复相关系数(R_(CV))为0.948,标准误差(SD_(CV))为10.362.随机抽出样本进行外部检验,得到测试集的复相关系数(R_(test1)及R_(test2))分别为0.979和0.939,标准误差(SD_(test1)及SD_(test2))分别为6.400和10.162.研究结果表明,使用该方法所建模型具有良好的预测能力和稳定性.展开更多
将一种反映分子局部微环境描述子——原子电性相互作用矢量(Vector of atomic electronegative in-teraction,VAEI)和原子杂化状态指数(Atomic Hybridation State Index,AHSI)用于对位壬基酚(p-NP)异构体的共60个13C-NMR谱建模模拟,应...将一种反映分子局部微环境描述子——原子电性相互作用矢量(Vector of atomic electronegative in-teraction,VAEI)和原子杂化状态指数(Atomic Hybridation State Index,AHSI)用于对位壬基酚(p-NP)异构体的共60个13C-NMR谱建模模拟,应用多元线性回归方法得到定量结构波谱关系(QSSR)模型的复相关系数(RM1)为0.996,标准误差(SDM1)为4.982.采用留一法交互检验的复相关系数(RCV1)为0.994,标准误差(SDCV1)为5.505.随机抽出两部分样本进行检验,得到测试集的复相关系数(Rest1及Rest2)分别为0.996和0.995,标准误差(SDest1及SDest2)分别为5.005和5.322.研究结果表明,使用VAEI和AHSI所建模型具有良好的预测能力和稳定性.展开更多
应用一种反映分子局部微环境描述子--原子电性相互作用矢量(vector of atomic elec-tronegative interaction,AEIV)和原子杂化状态指数(Atomic Hybridation State Index,AHSI)对饱和脂肪酮类化合物的55种分子中的153个13C NMR谱建模模拟...应用一种反映分子局部微环境描述子--原子电性相互作用矢量(vector of atomic elec-tronegative interaction,AEIV)和原子杂化状态指数(Atomic Hybridation State Index,AHSI)对饱和脂肪酮类化合物的55种分子中的153个13C NMR谱建模模拟,应用多元线性回归方法得到定量结构波谱关系(QSSR)模型的复相关系数RMM=0.997,标准偏差为SDMM=7.155.采用留一法交互检验的结果是RCV=0.993,SDCV=10.195.并随机抽出三部分分子进行检验,得到的相关系数分别是RMM1=0.996,RMM2=0.996,RMM3=0.999.研究结果表明使用AEIV和AHSI所建模型预测能力是相当稳定的.展开更多
Molecular structures of reactants were characterized by molecular electronegativity distance vector (VHMED) considering hydrogen association. A reasonable molecular modeling equation with 4-parameters was achieved f...Molecular structures of reactants were characterized by molecular electronegativity distance vector (VHMED) considering hydrogen association. A reasonable molecular modeling equation with 4-parameters was achieved for quantitative structure-property/activity relationship (QSPR/QSAR) by stepwise multiple regression (SMR) that the variable was introduced item by item in significant level order. A high correlation coefficient (R = 0.980) demonstrates that the model is able to well express a quantitative relation between stereoselectivity and the reactant structures as quantitative structure-reactivity/stereoselectivity relationship (QSRR/QSSR). The multiple correlation coefficient (Rcv= 0.964) was tested through cross-validation with the leave-one-out (LOO) procedure. The above results show that the model possesses high estimation stability and good prediction ability between the amount of both cis and trans isomers in products and reactants.展开更多
基金Youth Foundation of Education Bureau,Sichuan Province(13ZB0003)Natural Science Foundation of Education Bureau,Sichuan Province(15ZB0272)
文摘构建了基于分子三维结构计算的原子电负性距离矢量(atomic electronegative space distance vector,AESDV),用以描述各芳香醚类化合物分子中不同等价碳原子的化学微环境,并结合原子自身杂化状态指数(AHSI),建立了^(13)C核磁共振定量结构波谱关系的多元线性回归模型,复相关系数(R)为0.964,标准误差(SD)为8.673.经留一法交互检验的复相关系数(R_(CV))为0.948,标准误差(SD_(CV))为10.362.随机抽出样本进行外部检验,得到测试集的复相关系数(R_(test1)及R_(test2))分别为0.979和0.939,标准误差(SD_(test1)及SD_(test2))分别为6.400和10.162.研究结果表明,使用该方法所建模型具有良好的预测能力和稳定性.
文摘将一种反映分子局部微环境描述子——原子电性相互作用矢量(Vector of atomic electronegative in-teraction,VAEI)和原子杂化状态指数(Atomic Hybridation State Index,AHSI)用于对位壬基酚(p-NP)异构体的共60个13C-NMR谱建模模拟,应用多元线性回归方法得到定量结构波谱关系(QSSR)模型的复相关系数(RM1)为0.996,标准误差(SDM1)为4.982.采用留一法交互检验的复相关系数(RCV1)为0.994,标准误差(SDCV1)为5.505.随机抽出两部分样本进行检验,得到测试集的复相关系数(Rest1及Rest2)分别为0.996和0.995,标准误差(SDest1及SDest2)分别为5.005和5.322.研究结果表明,使用VAEI和AHSI所建模型具有良好的预测能力和稳定性.
文摘应用一种反映分子局部微环境描述子--原子电性相互作用矢量(vector of atomic elec-tronegative interaction,AEIV)和原子杂化状态指数(Atomic Hybridation State Index,AHSI)对饱和脂肪酮类化合物的55种分子中的153个13C NMR谱建模模拟,应用多元线性回归方法得到定量结构波谱关系(QSSR)模型的复相关系数RMM=0.997,标准偏差为SDMM=7.155.采用留一法交互检验的结果是RCV=0.993,SDCV=10.195.并随机抽出三部分分子进行检验,得到的相关系数分别是RMM1=0.996,RMM2=0.996,RMM3=0.999.研究结果表明使用AEIV和AHSI所建模型预测能力是相当稳定的.
文摘Molecular structures of reactants were characterized by molecular electronegativity distance vector (VHMED) considering hydrogen association. A reasonable molecular modeling equation with 4-parameters was achieved for quantitative structure-property/activity relationship (QSPR/QSAR) by stepwise multiple regression (SMR) that the variable was introduced item by item in significant level order. A high correlation coefficient (R = 0.980) demonstrates that the model is able to well express a quantitative relation between stereoselectivity and the reactant structures as quantitative structure-reactivity/stereoselectivity relationship (QSRR/QSSR). The multiple correlation coefficient (Rcv= 0.964) was tested through cross-validation with the leave-one-out (LOO) procedure. The above results show that the model possesses high estimation stability and good prediction ability between the amount of both cis and trans isomers in products and reactants.