INTERCALATION IN NOVEL ORGANOGELS WITH A STACKED PHENOL MICROSTRUCTURE
INTERCALATION IN NOVEL ORGANOGELS WITH A STACKED PHENOL MICROSTRUCTURE
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DOI：
10.1021/ja00100a008
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发表时间：
1994-10-19
影响因子：
15
通讯作者：
MCPHERSON, GL
中科院分区：
文献类型：
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作者：
TATA, M;JOHN, VT;MCPHERSON, GL
在非极性溶剂中，双尾阴离子表面活性剂二(2-乙基己基)琥珀酸磺酸钠(AOT)在加入合适的酚类物质后，形成一类有机凝胶。这种凝胶是新颖的，因为极少量的低分子溶质足以引起凝胶。酚和AOT的头基之间的氢键作用形成了这种凝胶的基础。凝胶-液体转变的定义很明确，当凝胶升温或吸收微量水分时，转变发生在非常窄的温度范围内。有证据表明，这些凝胶的潜在分子结构由堆积的、运动受限的苯酚分子链组成，表面活性物质被吸附在外部。我们在这份报告中提供了进一步的支持证据，并表明这些凝胶可以掺入大量的第二种物种，导致形成混合凝胶。核磁共振证据表明，这些掺杂剂中的一些通过插入芳香链的运动受限区域而堆积到凝胶基质中。考察了决定掺杂剂是否被嵌入的因素，如分子形状和质子给体强度(酸度)。
In nonpolar solvents, dry reversed micelles of the twin-tailed anionic surfactant sodium bis(2-ethylhexyl) sulfosuccinate (AOT) transform into a class of organogels upon the addition of suitable phenols. The gels are novel in that very small quantities of these low molecular weight solutes are sufficient to cause gelation. Hydrogen-bonding interactions between phenols and the head group of AOT form the basis for such gels. The gel-liquid transition is sharply defined and occurs over a very narrow temperature range when the gel is warmed or when trace amounts of moisture are absorbed. Evidence suggests that the underlying molecular architecture of these gels consists of strands of stacked and motionally restricted phenol molecules, with the surfactant adsorbed externally. We present further supporting evidence in this report and show that these gels can be doped with substantial quantities of a second species, leading to the formation of mixed gels. NMR evidence indicates that some of these dopants stack into the gel matrix by ''intercalation'' into the motionally restricted region of the aromatic strand. Factors such as the molecular shape and proton donor strength (acidity) that determine whether or not a dopant is intercalated are examined.