The Preparation, Characterization And Properties Of Pyridine Derivative @ SiO₂ Composite Materials

Organic materials containing heterocyclic have received increased interest, especially pyridine ring, mainly because the pyridine compounds contain conjugated system and a various of coordinating models. Therefore,the materials have wide potential applications for chemical sensors, organic light-emitting diodes, solar cells and field effect transistor. Based on surveys, a series of novel heterocyclic pyridine compounds and pyridine derivatives @ SiO2 composite materials were designed, synthesized and fully characterized.The phtotophysical properties were studied systemic. The main results were concluded as follows.1, On the basis of surveying extensive literature, the dissertation elucidated the basic concept, basic theory of two-photon absorption and the development trend of two-photon fluorescence materials, four novel compounds containing carboxylic acid, pyridine and triphenylamine were designed.2, Using the solvent-free or an aqueous phase Aldol condensation and Michael addition, Vismeier, Friedel-Crafts, solvent-free Wittig reactions etc., the compounds L1, L2, L3 and L4 containing pyridine and triphenylamine were synthesized and characterized by IR,1H NMR, MS and Microanlyses (C, H, O, N). It was found further study that L1, L2, L3 possess selected coordinating ability to several metal ions Co2+, Fe3+, Ni2+ and Cu2+.3, Through improvement of synthetical method, L5-L9 were synthesized and characterized by IR,1H NMR, MS, Microanlyses (C, H, O, N, Si), SEM, TEM, XRD, and TGA. Spectral study show that the two-photon absorption cross section for the compounds L5-L9 were enhanced significantly.4, After the ligand L5-L9 thorough hydrolysis by using reverse microemulsion method, dispersed particles of pyridine derivatives @ SiO2 composite microspheres materials were obtained. It was concluded that the morphology of composite materials was significantly effected by the structure of pyridine ligand, the L6 and L7 @ SiO2 nano-composite materials were nanosphere; L5 @ SiO2 composite microspheres was unstable, resulting in pyridine ligand off from the silicon sphere, forming oriented organic nanorods, L8 @ SiO2 composite materials arise fromπ-πstacking interactions of the pyridine,forming nanoribbons; L9 @ SiO2 composite is from the rigid skelecton of terpyridine, forming a porous morphology.