Phosphonioalkylthiosulfate zwitterions—new masked thiol ligands for the formation of cationic functionalised gold nanoparticles
作者:Yon Ju-Nam、Neil Bricklebank、David W. Allen、Philip H. E. Gardiner、Mark E. Light、Michael B. Hursthouse
DOI:10.1039/b610480k
日期:——
We report the synthesis and structural characterisation of a new family of stable phosphonioalkylthiosulfate zwitterions, R3P+(CH2)nS2O3â (R = Ph or Bu, n = 3,4,6, 8 or 10) which behave as cationic masked thiolate ligands with applications in the functionalisation of gold nanoparticles, having potential as new diagnostic biorecognition systems. The ligands were prepared by treatment of Ï-bromoalkylphosphonium salts with sodium thiosulfate. The crystal and molecular structures of the zwitterions (R = Ph, n = 3) and (R = Bu, n = 3) were determined. A series of phosphonioalkanethiolate-capped gold nanoparticles dispersed in water was prepared by borohydride reduction of potassium tetrachloroaurate in the presence of the zwitterions in a dichloromethaneâwater system. UV-visible spectroscopy and scanning transmission electron-microscopy indicated that capped nanoparticles of ca. 5 nm diameter were present.
我们报道了一类新型稳定的膦氧烷基硫代硫酸酯两性离子R3P+(CH2)nS2O3â的合成与结构表征,其中R为苯基或丁基,n为3、4、6、8或10,这些化合物作为阳离子型掩蔽硫醇盐配体,用于功能化金纳米粒子,具有作为新型生物诊断识别系统的潜力。这些配体是通过用硫代硫酸钠处理Ï-溴代烷基磷盐来制备的。我们对(R=苯基,n=3)和(R=丁基,n=3)两性离子的晶体和分子结构进行了测定。通过在二氯甲烷-水体系中,在两性离子存在下用硼氢化钠还原四氯金酸钾,制备了一系列分散于水的膦氧烷基硫醇盐包覆的金纳米粒子。紫外-可见光谱和扫描透射电子显微镜表明存在直径约为5纳米的包覆纳米粒子。