Banasz Radosław, Kubicki Maciej, Wałęsa-Chorab Monika
Faculty of Chemistry, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland.
Dalton Trans. 2020 Nov 3;49(42):15041-15053. doi: 10.1039/d0dt03232h.
Transmissive-to-colored electrochromism has been achieved by combination of MLCT of transition metal complexes with the electrochromic properties of ligand molecules. The color transitions were from yellow to dark brown for the Fe(ii) complex, yellow to orange to bluish-green for the Co(ii) complex and yellow to green for the Zn(ii) complex. By using a metal ion-ligand coordination approach, the self-assembly of hydrazone-based ligands containing a triphenylamine group with appropriate metal salts (FeCl2, Co(ClO4)2 and Zn(BF4)2) produced novel complexes of the general formula [ML2]X2. The isolated complexes were characterized by spectroscopic methods, and the Co(ii) complex also by X-ray diffraction analysis. Thin films of the complexes have been obtained by a spray-coating method and they were used in the construction of electrochromic devices, which showed good electrochromic stability, a high color contrast of 47.5% for Fe(ii), 37.2% for Co(ii) and 33.7% for Zn(ii) complexes and fast coloring and bleaching times.
通过将过渡金属配合物的金属-配体间电荷转移（MLCT）与配体分子的电致变色特性相结合，实现了向色性电致变色。对于Fe（II）配合物，颜色从黄色转变为深棕色；对于Co（II）配合物，颜色从黄色转变为橙色再到蓝绿色；对于Zn（II）配合物，颜色从黄色转变为绿色。通过金属离子-配体配位方法，含有三苯胺基团的腙基配体与适当的金属盐（FeCl2、Co(ClO4)2和Zn(BF4)2）自组装生成通式为[ML2]X2的新型配合物。通过光谱方法对分离得到的配合物进行了表征，Co（II）配合物还通过X射线衍射分析进行了表征。通过喷涂法获得了配合物薄膜，并将其用于构建电致变色器件，该器件表现出良好的电致变色稳定性，Fe（II）配合物的高颜色对比度为47.5%，Co（II）配合物为37.2%，Zn（II）配合物为33.7%，且着色和褪色时间快。
