Monolayer Assembly Of Polycyclic Acromatics At Solid-Liquid Interfaces, And Studies On Their Photophysical Behaviors And Sensing Performances

In recent years, monomolecular assemblies on solid surfaces have attracted growing attention due to their potential applications in creation of sensing films. Chemical immobilization of small molecules onto substrate surfaces is one of the important approaches to prepare monomolecular assemblies. Based upon this methodology, a new idea of designing sensing films based on the supramolecular interactions of polycyclic aromatics self-assembled on solid-liquid interfaces was proposed in our laboratory, and a series of novel sensing films, which are sensitive to the purity of water, the presence of nitrite in aqueous phase, nitromethane in methanol, ethanol or water, or the composition of the mixture of water and ethanol, were successfully created.On the bases of the above-mentioned research works and the reviews on self-assembled monolayers on silicon dioxide surfaces and fluorescence sensing films, several sensing films were designed and prepared by changing the sensing element, adjusting the length of spacers, and altering the sub-structures of spacers in this thesis, and these sensing films were proved to be sensitive to the presence of dicarboxylic acids, organic copper (II) salts, and copper (II) salts, respectively. Furthermore, their sensing ability, high sensitivity, ideal reversibility, and long lifetime make them worthwhile to be exploited further.First, the concept of molecular recognition was introduced into the design and preparation of sensing films, two novel photo-induced luminescence films have been prepared by immobilizing pyrene on glass plate surfaces via flexible long spacers, containing ethylenediamine or 1,3-dianinopropane and 3-glycidoxypropyltrimethoxy-silane. During the designing of the films, imino units were intentionally introduced into a spacer. Imino units were chosen due to their character to form hydrogen bond with carboxyhydroxy groups. It was expected that the specific interaction of the imino group with carboxyhydroxy group would result in insertion of dicarboxylic acids into...