Syntheses And Characterization Of New â…¡ B-Group Borophosphates

Due to their potential industrial applications in various aspects, the research on borophosphates has attracted many scientists and become a hot field. In this thesis, by considering the problems and weak points of the related researches, new borophosphate systems containing group IIB elements have been investigated. In the meantime new synthetic methods and the mechanisms of the compound formation have been studied. The various physical properties have also been characterized in consideration of these compounds as potential fluorescent materials. The thesis has contributed in a wide scope to the field of borophosphate researches. The main results obtained are as follows : 1. Successfully synthesized the first Cd containing compound NaCd(H2O)2[BP2O8]0.8H2O, and systematically investigated the whole alkali metal systems which resulted to the syntheses of a series of new compounds, namely ACd(H2O)2[BP2O8]-xH2O(A=Li, K, NH4, (Li,Rb)). Their crystal structures have been characterized by single crystal X-ray diffractions. The fluorescent properties of these compounds excited by UV light showed that all of them are very similar, which indicate the dominant character of the host framework. Although the light output is not strong among these compounds but the first time observation of the fluorescent properties in these systems are significant regarding to their possible modifications by doping with other elements. It is expected new fluorescent materials will be discovered in these systems. 2. Successfully synthesized NaCd(H2O)2[BP208>0.8H2O and NaZn(H2O)2[BP2O8]H2O at ambient temperature and pressure. The reaction and formation procedure of NaZn(H2O)2[BP2Og]H2O wasmonitored by XRD, and the possible reaction mechanism is proposed. The morphology of the products at different reaction temperatures has been characterized with SEM.3. The single crystal of [CH3(CH2)11NH3+][H2PO4-] has been obtained and its crystal structure characterized by X-ray diffraction methods. It is so far the structure with the longest amine chains ever refined in such kind of compounds. The fluorescence of the compound excited by UV light give bright white light emission with moderate decay time. It is a potential white light emission material.