直链共轭多烯电子的极化率随碳链增长变化规律的研究

本文采用引入外电场微扰的量子化学方法计算了直链共轭多烯H(-CH=CH-)~nH(n=1, 2, …, 15)电子的极化率。取乙烯电子的极化率α(1)为参照值, 首次运用关系式α(n)=α(n).α(1).n分析了系列多烯σ, π和全价电子的极化率随n增大的变化规律, 结果表明, 随着n的增大, α^σ(n)始终接近于1, 即有α^σ(n)=α^σ(1)n; 而α^π(n)开始增大明显, 然后增幅逐渐降低, 当n达某一值n~0后趋于一极限, 即有: nα^π(n-1), 当n≥n~0后, α^π(n)=α^π(n~0).α^π(1).n; 合价电子情况同π电子, 文中用电子分布重心的位移图象描述了这一结论。

Study on varying rule of the electron polarizability of straight-chain polyene with increasing of carbon-chain lenth

The quantum chem. method introduced within external elec. perturbation field approach is used to calculate the electron polarizability of straight-chain polyene H(CH:CH)nH (n = 1-15). The varying rule of electron polarizability of s, p and total electron system of polyenes with the increasing of of carbon-chain length was discussed.o