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首页> 外文期刊>Journal of liquid chromatography and related technologies >Estimation of hydrophobicity using quasi-molecular volume of quaternary ammonium ions
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Estimation of hydrophobicity using quasi-molecular volume of quaternary ammonium ions

机译：使用季铵离子的准分子体积估算疏水性

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When the Cu(II), Co(III), Ni(II), and Fe(II)chelates with 2-(5-Nitro-2-pyridyl-5-[N-propyl-N-sulphopropyl]amino)phenol (Nitro-PAPS)were separated on octadecylsilane(ODS)stationary phase(Kaseisorb ODS Super and Kaseisorb LC ODS-300-5)by the additiojn of several quaternary ammonium salts(Q~+Br)individually to the aqueous ACN mobile phase, a correlation of these hydrophobic cation's character with the retention of the chelates was examined. The degree of the variation of the stationary phase due to the adsorption of quaternary ammonium ion (Q~+)is measured by using a series of elution time of a solute, which was obtaiend by its successive injection. When the alkyl group of Q~+ is larger, he period for attaining the equilibrium becomes longer. As a concentration of Q~+ is higher, the period becomes longer. The estimation of quasi-molecular volume is proposed. The estimation volume provides its first order relationship with log K' of the metal chelates, regardless of the difference of tis charged position in the structure. The degree of the slope of the first order relationship corresponds to the number of Q~+ associated with metal/Nitro-PAPS chelate. The elution order corresponds to the total number of Q~+ and Nitro-PAPS being associated with metal ions.
机译：当Cu（II），Co（III），Ni（II）和Fe（II）与2-（5-硝基-2-吡啶基-5--5- [N-丙基-N-磺丙基]氨基）苯酚螯合时（在八烷基硅烷（ODS）固定相（Kaseisorb ODS Super和Kaseisorb LC ODS-300-5）上分别通过将几种季铵盐（Q〜+ Br）加到ACN水溶液的流动相中分离出Nitro-PAPS）这些疏水性阳离子的特征与螯合物的保留率进行了研究。通过使用一系列溶质的洗脱时间来测量由于季铵离子（Q〜+）吸附而引起的固定相变化的程度，该溶质的洗脱时间可以通过连续注入来确定。当Q〜+的烷基较大时，达到平衡的时间变长。当Q〜+浓度越高，周期越长。提出了准分子体积的估计。估计量提供与金属螯合物的log K'的一阶关系，而与结构中带电位置的差异无关。一阶关系的斜度对应于与金属/ Nitro-PAPS螯合物相关的Q +的数量。洗脱顺序对应于Q〜+和Nitro-PAPS与金属离子缔合的总数。

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