Structural evolution of glutathionate-protected gold clusters studied by means of 197Au Mossbauer Spectroscopy
Structural evolution of glutathionate-protected gold clusters studied by means of 197Au Mossbauer Spectroscopy
复制标题
通过 197Au 穆斯堡尔光谱研究谷胱甘肽保护的金簇的结构演化
DOI：
10.1007/s10751-012-0708-2
复制
发表时间：
2013
影响因子：
--
通讯作者：
Norimichi Kojima
中科院分区：
文献类型：
--
作者：
Hajime Kamebuchi;Masashi Okubo;Atsushi Okazawa;Masaya Enomoto;Jun Harada;Keiichiro Ogawa;Goro Maruta;Sadamu Takeda;Norimichi Kojima;Cyrille Train;Michel Verdaguer;Norimichi Kojima
对一系列谷胱甘肽保护的金团簇Aun（SG）m（n = 10 − ~55）的197 Au穆斯堡尔谱进行了重新分析，以了解其结构演化行为.通过假设Au 25（SG）18中三个位点的个别异构体位移和四极分裂，成功地确定了由不同数目（0、1和2）的GS配体配位的金原子的数目（Tsukuda等人，Chem Lett 40：1292，2011）。分析表明，在n = 10 − ~55范围内，Aun（SG）的结构发生了剧烈的演化.在Au_（10）（SG）_（10）中，所有的金原子都与GS配体成键，形成-Au-S（G）-环状结构。Au_（10）（SG）_（10）具有索烃结构。在n = 25时，出现没有GS连接的单个Au原子，这与由六个斯台普斯-S（G）-[Au-S（G）-]2保护的二十面体Au 13核心的形成一致。在n = 39时，Au_（39）（SG）_（24）与Au_（38）（SC_2 H_4Ph）_（24）具有相似的结构，都是面稠合的双二十面体Au_（23）核。
197Au Mössbauer spectra of a series of glutathionate-protected gold clusters, Aun(SG)m, withn= 10 − ~55, were re-analyzed to understand the structure evolution behavior. The numbers of gold atoms coordinated by different numbers (0, 1, and 2) of the GS ligands were successfully determined by assuming individual isomer shifts and quadrupole splittings for the three sites in Au25(SG)18(Tsukuda et al., Chem Lett 40:1292, 2011). The analysis revealed the drastic structural evolution of Aun(SG)min the range ofn= 10 − ~55. In Au10(SG)10, all the gold atoms are bonded to GS ligands, indicating –Au–S(G)– cyclic structures. A catenane structure was proposed for Au10(SG)10. Atn= 25, a single Au atom without the GS ligation appeared, consistent with the formation of an icosahedral Au13core protected by six staples, –S(G)–[Au–S(G)–]2. Atn= 39, it is considered that Au39(SG)24has a similar structure to that of Au38(SC2H4Ph)24with face-fused bi-icosahedral Au23core.