Study of the correlations of the MLCT Vis absorption maxima of 4-pentacyanoferrate- 4′-arylsubstituted bispyridinium complexes with the Hammett substituent parameters and the solvent polarity parameters<i>E</i><sub><i>T</i></sub><sup><i>N</i></sup>and AN
作者:Raffaello Papadakis、Athanase Tsolomitis
DOI:10.1002/poc.1514
日期:2009.5
substituted bispyridinium salts have been synthesized using 2,4‐dinitrophenyl‐ bispyridinium chloride as the starting material, which was arenamine exchanged via the Zincke reaction. These aromatic heterocyclic salts were used as ligands, acting as Lewis bases to form a series of 4‐pentacyanoferrate‐4′‐aryl substituted bispyridinium complex salts in high yields. The complex salts were characterized using
在这项工作中,使用2,4-二硝基苯基-双吡啶鎓氯化物作为起始原料合成了六种新的4-芳基取代的双吡啶鎓盐,该芳烃是通过Zincke反应交换的芳胺。这些芳族杂环盐用作配体,充当路易斯碱,以高收率形成一系列4-戊酰基高铁酸酯-4'-芳基取代的双吡啶络合物盐。使用几种光谱技术(包括1 H和13 C NMR光谱,UV-Vis和FTIR分光光度法)对络合盐进行了表征。这些材料具有许多有趣的电子和光学特性。在此,我们主要集中于这些材料的电子吸收。这些材料的可见金属-配体电荷转移(MLCT)谱带指定为dπ(Fe II)→ π *(L)被证明受(配合物苯环的)取代基变化的影响,但主要受溶剂极性变化的影响。很小的溶剂极性变化(例如,水到甲醇)引起的带隙甚至达到4000 cm -1。在四种质子传递溶剂(水,2,2,2-三氟乙醇,乙二醇和甲醇)中研究了Vis吸收光谱。然后该取代基的效果,使用的哈米特方程,其具有