当前位置: X-MOL 学术J. Phys. Chem. Solids › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
The Au25(SR)18 cluster carrying icosahedral dodecaborate and glutathione ligands: A spectroscopic view
Journal of Physics and Chemistry of Solids ( IF 4 ) Pub Date : 2021-03-01 , DOI: 10.1016/j.jpcs.2020.109838
Eva Valušová , Mária Kaňuchová , Tomáš Baše , Viktor Víglaský , Marián Antalík

Abstract The functionality of Au25(S-glutathione)18 clusters change when some of the ligands in the cluster shell are replaced for other species. In this study we report on the synthesis and characterisation of a new cluster in which undecahydro-closo-dodecaborate thiolates are introduced as constituents of the shell surrounding the gold core. This is the first reported example in which the Au13 core of the Au25(S-glutathione)18 cluster is covered with an Au–S–B linkage instead of an Au–S–C on the dimeric shell units using a ligand exchange reaction. The spectra of the new cluster species clearly indicate a successful ligand exchange while retaining the gold core with undisrupted semirings containing both thiolate species. The resulting clusters were identified as Au25 [(S-glutathione)18-x (S-closo-borate)x-)] (x = 3, 4). Despite the achiral character of the closo-borate thiolates entering the semiring, increased chirality traces were observed in the high-energy region. Circular dichroism (CD) responses are ligand dependent and provide a fingerprint characteristic of the ligands present in the cluster. The next generation of such surface functionalized clusters provides unique base for computational and application studies.

中文翻译:

带有二十面体十二硼酸盐和谷胱甘肽配体的 Au25(SR)18 簇:光谱视图

摘要 Au25(S-谷胱甘肽)18 簇的功能在簇壳中的一些配体被其他物种替换时发生变化。在这项研究中,我们报告了一个新簇的合成和表征,其中引入了十一氢-氯-十二硼酸盐硫醇盐作为金核周围壳的成分。这是第一个报道的例子,其中使用配体交换反应,Au25(S-谷胱甘肽)18 簇的 Au13 核心被 Au-S-B 键覆盖,而不是二聚体壳单元上的 Au-S-C。新簇种类的光谱清楚地表明配体交换成功,同时保留了含有两种硫醇种类的不间断半环的金核。所得簇被鉴定为 Au25 [(S-谷胱甘肽)18-x (S-closo-borate)x-)] (x = 3, 4)。尽管进入半环的 closo-borate thiolates 具有非手性特征,但在高能区域观察到增加的手性痕迹。圆二色性 (CD) 响应依赖于配体,并提供簇中存在的配体的指纹特征。下一代这种表面功能化簇为计算和应用研究提供了独特的基础。
更新日期:2021-03-01
down
wechat
bug