Structure-property relationships in conjugated donor–acceptor systems functionalized with tetrathiafulvalene
作者:Chunyang Jia、Jiaqiang Zhang、Ligong Zhang、Xiaojun Yao
DOI:10.1039/c1nj20384c
日期:——
The properties of two donorâacceptor compounds tetrathiafulvalene-acenaphtho[1,2-b] quinoxaline (1) and tetrathiafulvalene-3-nitro-acenaphtho[1,2-b]quinoxaline (2) have been investigated by solution-state studies (electrochemistry, absorption, self-assembly) and theoretical calculations (DFT, TD-DFT). The electrochemical studies indicate the nitro-substituted effect on their redox properties is negligible. Both compounds show effective intramolecular charge transfer (ICT) transitions in the UV-Visible range in solution. Compared with compound 1, compound 2 has a bathochromic shift in the absorption spectra, the λmaxâICT has been extended from 20â800 cmâ1 to 19â700 cmâ1 (480 nm to 507 nm). In addition, when the nitro group is employed, the self-assembly characteristics of the two compounds are substantially changed from ribbon-like nanostructures to root-like nanostructures. Density functional theory (DFT) calculations provide insights into their molecular geometries, electronic structures, and physico-chemical properties.
通过溶液状态研究(电化学、吸收、自组装)和理论计算(DFT、TD-DFT),研究了四硫富戊烯-苊并[1,2-b]喹喔啉(1)和四硫富戊烯-3-硝基-苊并[1,2-b]喹喔啉(2)这两种供体-受体化合物的性质。电化学研究表明,硝基取代对其氧化还原特性的影响可以忽略不计。这两种化合物在溶液的紫外-可见光范围内都显示出有效的分子内电荷转移(ICT)转变。与化合物 1 相比,化合物 2 的吸收光谱发生了浴色偏移,δ "maxâICT 从 20â800 cmâ1 扩展到 19â700 cmâ1 (480 纳米到 507 纳米)。此外,当使用硝基时,这两种化合物的自组装特性发生了很大变化,从带状纳米结构变成了根状纳米结构。密度泛函理论(DFT)计算深入揭示了这两种化合物的分子几何结构、电子结构和物理化学性质。