Hybrid Inorganic-Organic Materials Carrying Tertiary Amine and Thiourea Residues Tethered on Mesoporous Silica Nanoparticles: Synthesis, Characterization, and Co-Operative Catalysis
作者:Alessandra Puglisi、Rita Annunziata、Maurizio Benaglia、Franco Cozzi、Antonella Gervasini、Vittorio Bertacche、Maria Chiara Sala
DOI:10.1002/adsc.200800635
日期:2009.1
2-nitrostyrene, a reaction that under solvent-free conditions occurred in quantitative yield. By carrying out several experiments with the bifunctional catalysts featuring different molar ratios of active sites, and with different combinations of monofunctional supported and non-supported catalyst, the co-operativity of the tertiary amine and thiourea residues in catalyzing the reaction was demonstrated. The
通过共缩聚法合成了具有不同负载量的叔胺和硫脲残基(残基比率分别为53 / 47、68 / 32和22/78)的介孔二氧化硅纳米粒子,并通过CP MAS NMR,粉末XRD,SEM对其进行了全面表征,BET,BJH和FT-IR技术。在将乙酰丙酮共轭添加到2-硝基苯乙烯中时,将这些材料作为双功能催化剂进行了测试,该反应在无溶剂条件下以定量收率进行。通过使用具有不同活性位摩尔比的双功能催化剂,以及单官能负载型和非负载型催化剂的不同组合进行几个实验,证明了叔胺和硫脲残基在催化反应中的协同作用。双功能催化剂的用途扩展到向活化的亚胺中添加乙酰丙酮。证明了总共三个反应循环的催化剂再循环,没有显着降低活性。