Abstract
In this research, 18 compounds were synthesized by employing organic amine as template under hydrothermal conditions. They were classified into three systems: System A put emphasis on reduction of energy consumption and chemical recycling of waste PET. Reactions with the use of microwave as an energy source largely cut down the reaction time to 1% as compared to conventional heating time and successfully yielded three single-phased products of A1, A2 and A3. The compounds A2,A3 and A5 displayed 3D structures “seemingly the same “ but they are not exactly identical due to the common organic linkers of BDC moiety adopting different orientations with respect to the same inorganic framework. The results should overturn our conventional cognition on scaling up product by microwave synthesis. On the other hand, scraps of waste PET bottle were successfully employed in two reactions as potent reagents to produce new compound A5 and high-valued phosphor materials A6 with potential application to white-light LEDs, providing a brand new perspective to chemical recovery of waste PET. System B contains six layered zinc phosphates encapsulating organic supra molecules as guest species. Bearing intricate hydrogen-bonding patterns within each layer, the pseudo-neutral (H3tren)2[Zn3(PO4)4] sheets are highly adaptable to varied achiral organic monomers, making them transformed into different chiral supramolecular chains. As a result, the entire structures of B1-B4 were turned into chiral as well. Depending on the molecular size of guest monomers, the layer gap was able to pop up the most to 2.01 nm (B4). Furthermore, the zinc center could be doped with homo-valence transition metal ions. Incorporation of Co2+ ions into layers exerted strong influence on supramolecular guests’ arrangements while doping of Mn2+ ions created novel photoluminescence property-the inter-layer supramolecular guest became a good sensitizer for the emission of bright orange- (from B1-Mn) or pink- (from B4-Mn) light under UV excitation. System C involved the use of bola-type surfactant, the long chain amine-DADD, as organic template. In the synthesis additional bulky organic acid-BPDA was included together with (metal) phosphate to generate six layered materials. The compound of C3 is highly interesting as it not only was observed ultra-large inter layer gap of 2.2nm but also revealed intriguing green afterglow property. In the three systems, every structure was well-characterized and extended to the discussion on their syntheses, thermal properties, self-assembly of supramolecular guests and the mechanisms of luminescence. The study generated significant results with substantial novelty and made conceptual breakthroughs to the field of organic/inorganic hybrid metal phosphate materials.