论文部分内容阅读
芳香环或杂环通过NN双键连接形成的化合物如偶氮苯、偶氮吡咯等具有π共轭结构,此类分子有顺反两种构型,他们可以在光照条件下相互转换。分子构型转变会影响电子的共轭程度及其离域特性,因此含环结构的偶氮共轭分子具有光调制特性。反式偶氮苯分子为平面结构,顺式构型分子两个苯环有一定角度的扭转分子不在同一平面,实验和理论计算结果表明偶氮苯分子的键长、键角等受溶剂和取代基影响;光照可以实现偶氮苯分子的导电性改变,目前认为其导电性改变的原因主要是光致顺反异构而改变分子尺寸而引起。通过氮氮双键连接的杂环共轭分子能显著地降低分子的能隙,并使共轭化合物在更宽的波长范围内有强吸收,能提高太阳能光伏电池的转换效率,是理想的有机光伏材料。文章还对偶氮共轭聚合物的合成方法做了介绍,分析了含偶氮结构的共轭聚合物的光相应研究现状及其未来发展趋势。
Aromatic rings or heterocycles are connected by NN double bonds to form compounds such as azobenzene, azo-pyrrole and the like, which have π-conjugated structures. Such molecules have both cis and trans configuration, and they can convert to each other under illumination. Molecular configuration changes affect the degree of conjugation of the electrons and their delocalization properties, so the azo-conjugated molecules with ring structures have light modulation properties. The trans-azobenzene molecules are planar structures. The twisted molecules with a certain angle between the two benzene rings of the cis-configuration molecules are not in the same plane. The experimental and theoretical calculations show that the bond lengths and bond angles of the azobenzene molecules are controlled by solvents and substitutions Based effects; light can be achieved azobenzene molecular conductivity changes, the current view that the main reasons for the change of light-induced cis-trans isomerization and change caused by the molecular size. Heterocyclic conjugated molecules linked by a nitrogen-nitrogen double bond can significantly reduce the energy gap of the molecule and make the conjugated compound have a strong absorption in a wider wavelength range, which can improve the conversion efficiency of the solar photovoltaic cell and is an ideal organic Photovoltaic materials. The article also introduced the synthesis of azo-conjugated polymers and analyzed the light-related research status and future trends of azo-containing conjugated polymers.