Alam Tanveer, Tarannum Hina, Ali Shah Raj
K.L.D.A.V. Degree College, Roorkee, 247 667, India.
J Colloid Interface Sci. 2002 Jan 15;245(2):251-6. doi: 10.1006/jcis.2001.7968.
The interaction of aniline and p-anisidine with chromium ferrocyanide has been studied. Maximum uptake of both anilines was observed around pH 7. The adsorption data obtained at neutral pH were found to follow Langmuir adsorption. Anisidine was a better adsorbate because of its higher basicity. In alkaline medium (pH>8) both aniline and anisidine reacted with chromium ferrocyanide to give colored products. Analysis of the products by GC-MS showed benzoquinone and azobenzene as the reaction products of aniline while p-anisidine afforded a dimer. IR analysis of the amine-chromium ferrocyanide adduct suggests that the outer metal ion of chromium ferrocyanide and amino group of amines are responsible for the interaction. A possible reaction mechanism for the product formation in alkaline medium has been proposed. The present study suggests that metal ferrocyanides might have played an important role in the stabilization of organic molecules through their surface activity in the prebiotic condensation reactions.
已对苯胺和对甲氧基苯胺与亚铁氰化铬的相互作用进行了研究。在pH值约为7时观察到两种苯胺的最大吸附量。发现在中性pH值下获得的吸附数据符合朗缪尔吸附。由于对甲氧基苯胺的碱性较高，它是一种更好的吸附质。在碱性介质（pH>8）中，苯胺和对甲氧基苯胺都与亚铁氰化铬反应生成有色产物。通过气相色谱 - 质谱联用仪对产物进行分析表明，苯醌和偶氮苯是苯胺的反应产物，而对甲氧基苯胺生成了二聚体。胺 - 亚铁氰化铬加合物的红外分析表明，亚铁氰化铬的外层金属离子和胺的氨基是相互作用的原因。已提出了在碱性介质中产物形成的可能反应机理。本研究表明，在益生元前缩合反应中，金属亚铁氰化物可能通过其表面活性在有机分子的稳定化过程中发挥了重要作用。
