一维链状炔银的合成及其纳米粒子的催化活性

Reduction method preparation of silver nanoparticles on the catalytic reduction of nitro phenol

通过常规反应方法成功设计合成出新型一维链状炔银化合物Ag12(CF3COO)4(C≡CtBu)6(CH3O)2]n(1),并利用硼氢化钠使其还原制备出尺寸均一的银纳米粒子。利用X射线单晶衍射、红外光谱、元素分析及扫描电镜等方法对化合物的结构及其纳米粒子形貌进行了表征。结构分析结果表明,炔银聚合物的单元结构中包含12个通过Ag…Ag相互作用形成的银离子簇(简写成Ag12),6个[C≡CtBu]6-和4个[CF3COO]4-阴离子通过Ag-C或Ag-O相互作用包裹在Ag12簇的表面;这些簇集单元结构之间又利用Ag…Ag或Ag…O相互作用连接形成一维链状结构。在硼氢化钠还原剂的作用下,化合物1可以进一步形成40nm左右的银纳米粒子。催化性质研究表明,该类银纳米粒子可高效地将对硝基苯酚还原成对氨基苯酚。

Through conventional reaction method,a new alkynyl-silver compound of [Ag12（ CF3COO）4（ C≡CtBu）6（ CH3O）2]n（ 1） with 1D chain structure has been synthesized. The structure and topology of 1were characterized by X-ray single crystal diffraction,FTIR spectrum,elemental analysis and scanning electron microscope. The structural analysis indicates that the subunit of complex 1 contains a 12-core alkynyl-silver cluster constructed by Ag…Ag interactions,six [C≡C^tBu〗6-and four [CF3COO]4-organic anions fixed on the surface of alkynyl-silver（ I） cluster. The subunits further form 1D chain structure by different Ag···Ag interactions. The size of silver nanoparticles obtained by reduction of 1 by Na BH4 is about 40 nm. Catalytic property investigation shows that the silver nanoparticles obtained from 1 precursor can effectively catalyze the reduction of 4-nitrophenol into 4-aminophenol.