| Supramolecular chemistry is a new-developed chemistry, which is a new stage of chemical development. It has rapidly developed with the development of crown ether and the cave-like ligands of macrocyclic ligand and with the research of molecular self-assembly. It based on weak intermolecular interactions, molecular aggregates is the object of research of supramolecular chemistry. Such weak intermolecular interactions is not the traditional covalent bond strength, but is non-covalent intermolecular forces, including van der Waals force, hydrogen bonding force, ionic strength, cation-πandπ-πstacking force as well as the hydrophobic-lipophilic interactions and so on. Under normal conitions, it is the synergy and addition of several forces, what's more, it has a certain direction and selectivity. The binding force of its total strength is more than covalent bond strength. It is beacuse such a weak intermolecular coordinating interaction (collaboration, direction and selectivity), that determine the identification and assembly of molecules, furthermore, It form a variety of the new super-molecular system with such special features.This paper firstly describes the overall concept, development of supramolecular chemistry, the types and composition of supramolecular systems, then secondly, highlight the most important supramolecular material–Cyclodextrins, and introduce the applications of Cyclodextrins in analytical chemistry.On this basis, the authors attempted to study super-molecular interaction of the ethanol system and cyclodextrin supramolecular system. The full text consists of five chapters.The first chapter describes the applications of supramolecular chemistry in analytical chemistry.The second chapter study on extraction spectrophotometric determination of molybdenum in aqueous two—phase system of ethanol and ammonium sulfate, The chromogenic reaction of molybdenum(Ⅵ) with salicylfluorone to form a stable red complex (1:2) in the presence of acetic acid sodium acetate buffer solution at pH 3.0, However, the absorbance of molybdenum in the aqueous phase is not high. Based on this, the text study the formation conditions of aqueous two-phase and the nature of the extraction of molybdenum with the water-soluble organic solvent- ethanol under the action of inorganic salts. The experiment adopt aqueous two—phase system of ethanol and ammonium sulfate to increase the concentration of ethanol, using the sensitization effect of ethanol to increase the absorbance of the system, a new method for determination of molybdenum has been developed, the method has been applied in the determination of molybdenum in food sample with satisfactory results. And discussed the mechanism of sensitizztion effect of ethanol.The third chapter study Supermolecule Interaction in cadion-silver ion colour reaction system and its application, In pH=9.50 borax-sodium hydroxide buffer solution and tween-80 medium, cadion can react with silver (I) to form a stable red complex. This method can be used to determine the concentration of silver, but the sensitivity is not high. Based on this, this article increased the determination of silver absorbance and sensitivity by adding a certain amount of ethanol, a new method has been developed for the determination of silver. It has been applied in determination of silver in water samples with satisfactory results. Meanwhile, the text discussed the mechanism of sensitization effect of ethanol.The fourth chapter study the determination ofβ-Cyclodextrin by cadion fading spectrophotometry.The effect of the fading reaction of cadion withβ-Cyclodextrin is in the presence of cetyltrimethylammonium bromide(CTMAB). and in a medium of borax-sodium hydroxide buffer solution. A new spectrophotometric method for the determination ofβ-Cyclodextrin has been developed. The host:guest ratio of inclusion complex between cadion andβ-Cyclodextrin is 1:2.The fifth chapter study the determination ofβ-Cyclodextrin by neutral red fading spectrophotometry. The effect of the fading reaction of cadion withβ-Cyclodextrin is in the presence of cetyltrimethylammonium bromide(SDS), and acetic acid sodium acetate buffer solution at pH 6.0. A new spectrophotometric method for the determination ofβ-Cyclodextrin has been developed. The host:guest ratio of inclusion complex between cadion andβ-Cyclodextrin is 1:1. |
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