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| | An average valence (δ) of atom i in a molecule is defined as δai = (δai + Enyδoy)/(1 + Eng) . A novel topological index, which is an average valence connectivity index (mK) based on the adjacency matrix and δai , is derived in this paper. lK among mK has good structural selectivity, and high correlativity for the hydrophobicity parameters (logP ) of 56 alcohols. The correlation coefficient between lK and logP for 60 aliphatic alcohols is equal to 0.9948. The calcula... | | 分子中原子i的均价(δ_i~a)定义为δ_i~a=(δ_1~v+∑n_(ij)δ_(ij)~v)/(1+∑n_(ij))。在分子图的邻接矩阵基础上建构均价连接性指数(~mK)。其中~lK对醇类化合物呈现良好的结构选择性,并与56个醇类化合物的疏水性参数(logP)具有较好的相关性。与60中脂肪醇的logP的线性相关系数为0.9948。这两项均优于相应的文献方法。 | | 文摘来源 | | A characteristic value of atom i is defined as A_i=(δ_i~v+∑n_(ij)δ_(ij)~v)/(1+∑n_(ij)) . Based on the adjacency matrix, an average valence connectivity index is set up by A_i as ()~mL=(∑(A_i·A_j·A_k…))~(-0.5). The first topological index ()~1L among ()~mL is defined as ~1L=∑(A_i·A_j)~(-0.5). Then ()~1L of aliphatic alcohols were calculated. ()~1L has good structural selectivity. ()~1L and orientating group parameter (β) have high correlativity with the gas chromatographic ret... | | 在分子图的邻接矩阵基础上 ,构建了一个化合物均价连接性指数 mL ,mL =∑ (Ai·Aj·Ak… ) -0 5,其中一阶指数1L及定位基参数 β与 2 5种脂肪醇在 6种固定相 (SE 30 ,OV 3,OV 7,OV 11,OV 17和OV 2 5 )上的气相色谱保留指数I显著相关 ,相关系数均大于 0 .98。所建定量结构 保留关系 (QSRR)模型具有良好的稳定性和预测能力 ,较好地揭示了脂肪醇在不同固定相上气相色谱保留指数的变化规律。 | | 文摘来源 | |   |
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