静电势方法研究分子间的电子转移 Ⅱ.在光电转移模拟体系中的应用

Studies on Intermolecular Electron Transfer Using Electrostatic Potential Approach Ⅱ. Application to Photoelectric Conversion Simulating Systems

用从头算和静电势方法研究了光电转换模拟体系C_6H_7N+C_6H_8N^+中的分子间电荷转移。通过计算分子间的静电势分布,确定了电子在分子间运动所需穿透势垒的特性,对电子穿透几率及穿透弛豫时间等参数作了理论预测并研究了外接基团的影响。在分子间距d=0.35nm时,穿透几率P=2.94×10^(-4),穿透弛豫时间τ=3.4×10^(-10)s,在此情况下,由模型分子组成的截面积为10×1mm^2的多层分子膜,在光照条件下可能产生的理论光电流为0.28A。

An investigation of electron transfer has been made on photoeleetric conversion simulating system, C_6H_7N+C_6H_8N^+, by using electrostatic potential approach based on ab initio calculations proposed by the authors. Characteristics of intermolocular barriers tunnelled through by electrons, is determined according to distribution of electrostatic potential in intermolecu]ar region, which is first given by using SCF-MO wavcfuno-irons. Electronic penetration probability and penetration relaxation time at various intermolecular separations are presented. Substituting groups' effect on barrier height is also discussed. Typical kinetic parameters consist in: penetration probability P=2,94×10^(-4) and relaxation time τ=3.4×10^(-10)s, at an intermolecular separation d=0.35nm. In this case, theoretically allowed photoelectric current produced by one membranoe of multilayer modelling molecules with an intersection of 10×1rmm^2, would be 0.28 A.