液晶叶绿素铂电极的光感电位

将不同含量的液晶物质4-甲氧基苄叉4′-正丁基苯胺(MBBA)分别加到叶绿素a(Chla)的异辛烷溶液中, 将这些溶液分别涂在铂板上形成液晶叶绿素铂电极, 测求其光感电位ΔE的变亿; 另一方面将这些溶液分别涂在玻璃板上, 形成液晶叶绿素涂层的玻璃板, 测求其导数光谱特性谱峰(743 nm)相对高度h/h_T的变化。发现随着MBBA量的增加, ΔE与h/h_T两种数值均有极大信出现。另外用石油醚溶剂、异辛烷-石油醚(1:9V/V)溶剂代替异辛烷溶剂, 进行同样实验, 发现也都有这两种极大值出现, 而且这三种溶剂体系的六个极大值都发生在MBBA浓度为0.001±0.0005 mol L~(-1)范围内。本文根据导数光谱原理, 子结构以及液晶物质特性, 对以上实验的变化规律作了理论说明。

PHOTO-INDUCED POTENTIAL OF THE LIQUID CRYSTAL CHLOROPHYLL PLATINUM ELECTRODE

Various amounts of a liquid crystal such as 4-methoxybenzylidene-4'-n-butylaniline (MBBA) were added respectively into chlorophyll a (Chla)-isooctane solutions of the same concentration. These solutions were coated respectively on to platinum plates to form liquid crystal-chlorophyll platinum electrodes for determining the different photo-induced potential ΔE. On the other hand, these solutions were coated respectively on to glass plates to form the glass plates with the liquid crystal-chlorophyll layer for determining the different height of 743 nm characteristic peak of derivative spectrum h/h_T. It was found that both of ΔE and h/h_T apear the maximum values with the increase in quantity of MBBA. The same result can be found by substituting iso-octane by the petroleum ether and the isooctane-petroleum ether (1:9V/V). The MBBA molar concentration range in which all of the six maximum values from above three solvent systems occur is 0.001±0.0005. The regularity of the experimental results was theoretically elucidated by the principle of derivative spectrum, the molecular structure and the characteristics of liquid crystal.