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首页> 外文期刊>Spectrochimica acta, Part A. Molecular and biomolecular spectroscopy >Polyether precursors of molecular recognition systems based on the 9,10-anthraquinone moiety
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Polyether precursors of molecular recognition systems based on the 9,10-anthraquinone moiety

机译：基于9,10-蒽醌部分的分子识别系统的聚醚前体

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摘要

A series of novel polyether derivatives of 9,10-anthraquinone (AQ) was synthesized and characterized by means of UV Vis spectroscopy, acid-base titration and complexometric titration. The results were compared with 1-NEt(2)AQ and 1-NHEtAQ - model compounds of alkylaminoanthraquinones. Acetonitrile and methanol were used as solvents for determination of spectroscopic and acid-base properties. Complexometric titrations were carried out exclusively in acetonitrile. Spectral characteristic of these compounds strongly depends on pH. Addition of acid causes the decrease of absorption intensity and in some cases also a shift of the visible range band. The weakest base is the compound (2), and the strongest compound (1), both in methanol and acetonitrile solution. The introduction of an additional substituent in the position 8 of the anthraquinone compound increases its basicity. The presence of metal ions causes changes in intensity of absorption (decrease for compounds (2) and (3) and increase with bathochromic shift for (1) and (4)). For the determination of the coordination properties aluminum (III) ions were chosen. The highest complex stability constant with Al (III) ions is observed for compound (1), and the weakest for compound (3). The elongation of the polyether chain decreases the stability of the complex formed. (C) 2014 Elsevier B.V. All rights reserved.
机译：通过UV Vis光谱，酸碱滴定和复杂滴定合成了9,10-蒽醌（AQ）的一系列新型聚醚衍生物，并表征了酸碱滴定和复杂滴定。将结果与1-NET（2）AQ和1-NHETAQ - 烷基氨基蒽醌的模型化合物进行比较。使用乙腈和甲醇作为溶剂，用于测定光谱和酸碱性质。复杂滴定仅在乙腈中进行。这些化合物的光谱特性强烈取决于pH值。添加酸导致吸收强度的降低，并且在某些情况下也是可见范围带的偏移。最弱的碱是化合物（2），以及甲醇和乙腈溶液中的最强化合物（1）。在蒽醌化合物的位置8中引入额外的取代基增加了其碱度。金属离子的存在会导致吸收强度的变化（化合物（2）和（3）的减少，并随着（1）和（4）的碱基转移而增加。为了确定配位性质，选择铝（III）离子。对于化合物（1），观察到具有Al（III）离子的最高复杂稳定性常数，并且化合物（3）最弱。聚醚链的伸长率降低了形成的复合物的稳定性。 （c）2014 Elsevier B.V.保留所有权利。

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