シアニン系新規合成試薬を用いる陰イオン界面活性剤の定量 [in Japanese] Determination of anionic surfactants using newly synthesized n-dialkyl-2, 2'-thiacyanine dyes [in Japanese]
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Abstract
水溶液一相系でイオン会合反応を利用する陰イオン界面活性剤直接定量のための陽イオン性染料を新規に合成した．基本骨格はシアニンとし，二つのNに炭素数の異なる<i>n</i> -アルキル鎖を導入した四級塩染料を合成した．アルキル鎖の炭素数4と6のものは新規合成化合物であり，p<i>K</i><sub>a</sub>を求めた．炭素数2と3の市販品と合成した陽イオン試薬を用い，吸光光度法により陰イオン界面活性剤（DBS）との最適反応条件を検討した．3,3'-ジヘキシル-2,2'-チアシアニン（DHT，C6の試薬）を用いて，10<sup>－6</sup> MオーダーのDBSを定量することができ，検出下限は4×10<sup>－7</sup> Mであった．また，疎水性相互作用により，非イオン性界面活性剤，陽イオン界面活性剤とも反応することが分かり，DHTとのイオン会合定数を求めた．<br>
For the spectrophotometric determination of anionic surfactants in aqueous media, cationic dyes with a 2,2'-thiacyanine skeleton were newly synthesized. Carbon numbers of 4 and 6 in the <i>n</i>-dialkyl chain combined at the N position of 2,2'-thiacyanine are new compounds. Fundamental information, such as the p<i>K</i><sub>a</sub> values, was obtained. These two compounds and purchased diethyl- and dipropyl-2,2'-thiacyanine were examined for the spectrophotometric determination of an anionic surfactant, DBS. Of these, 3,3'-dihexyl-2,2'-thiacyanine (DHT) showed the best sensitivity. The calibration graph for DBS with DHT was linear up to 1×10<sup>−5</sup> M, and the detection limit was 4×10<sup>−7</sup> M. By a hydrophobic interaction, even a cationic surfactant, Zephiramine, and a nonionic surfactant, Triton X-100, could react with DHT. The ion-association constants for these surfactants with DHT were obtained.<br>
Journal
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- BUNSEKI KAGAKU
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BUNSEKI KAGAKU 53(9), 919-923, 2004-09-05
The Japan Society for Analytical Chemistry