Synthesis of Solid-state Metal Phosphate Catalysts Having Chiral Structure

点击翻译按钮获取中文摘要

Various structural materials of cyclohexaphosphate with metal ions and cations of organic amines were synthesized with the intention of exploring chiral solid catalysts for asymmetric organic syntheses. All the synthesized crystal materials were characterized structurally. The organic cations of aliphatic amines are very important for forming structures because the monomeric cyclohexaphosphate anions neutralized with the organic cations were linked together through hydrogen bondings between the organic cations, thus forming two-dimensional network in the structures. When metal canons are present in the system, the metal cations play a role to connect cyclohexaphosphate anions, and then a infinite chain of metal cation-cyclohexaphosphate is formed, of which positive change is neutralized with again the organic cations which allows the formation of three-dimensional networks.In the case of [Cu(bpy)_2] [Cu(bpy)] [Cu(bpy)(py)]P_6O_<18->10H_20, the structural analysis proved that the hexametaphosphaste complex was crystallized through a self-assembling with discrete molecules. Three different Cu^2^- existed by coordinating with oxygens of the hexametaphosphate anion in different manners. The number of coordinated oxygens is one for [Cu(bpy)_2]^<2+>, three for (Cu(bpy)]^<2+>, and two for [Cu(bpy)(py)]^<2+>. All the coordinated oxygens belong to different P0_4 tetrahedra each other. Therefore an asymmetric center appeared on this complex. A pair of those enantiomer existed in an unit cell, thus the crystal was racemate. Further works are undertaken now to synthesize chiral phosphate complexes.