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An ultrastable thiolate/diglyme ligated cluster: Au20(PET)15(DG)2
Nanoscale ( IF 5.8 ) Pub Date : 2022-06-17 , DOI: 10.1039/d2nr02426h Ian D Anderson 1 , Yuchen Wang 2 , Christine M Aikens 2 , Christopher J Ackerson 1
Nanoscale ( IF 5.8 ) Pub Date : 2022-06-17 , DOI: 10.1039/d2nr02426h Ian D Anderson 1 , Yuchen Wang 2 , Christine M Aikens 2 , Christopher J Ackerson 1
Affiliation
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The synthesis and characterization of an Au20(PET)15(DG)2 (PET = phenylethane thiol; DG = diglyme) cluster is reported. Mass spectrometry reveals this as the first diglyme ligated cluster where diglyme ligands survive ionization into the gas phase. Thermal analysis shows the cluster degrades at 156 °C, whereas the similar Au20(PET)16 cluster degrades at 125 °C, representing markedly increased thermal stability. A combination of NMR spectroscopy and computational modeling suggests that the diglyme molecules bind in a tridentate manner for this cluster, resulting in a binding energy of 35.2 kcal mol−1 for diglyme, which is comparable to the value of ∼40 kcal mol−1 for thiolates. IR and optical spectroscopies show no evidence of assembly of this cluster, in contrast to Au20(PET)15(DG), which readily assembles into dimeric species, which is consistent with a tridentate binding motif. Evidence for stacking among Au-bound and non-bound diglyme molecules is inferred from thermal and mass analysis.
中文翻译：
超稳定的硫醇盐/二甘醇二甲醚连接簇：Au20(PET)15(DG)2
报道了 Au 20 (PET) 15 (DG) 2 (PET = 苯硫醇; DG = 二甘醇二甲醚) 簇的合成和表征。质谱法显示这是第一个二甘醇二甲醚连接簇，其中二甘醇二甲醚配体在电离后进入气相。热分析表明簇在 156 °C 时降解，而类似的 Au 20 (PET) 16簇在 125 °C 时降解，表明热稳定性显着提高。NMR光谱和计算模型的结合表明，二甘醇二甲醚分子以三齿方式结合该簇，导致二甘醇二甲醚的结合能为35.2 kcal mol -1，与~40 kcal mol -1的值相当对于硫醇盐。IR 和光学光谱没有显示该簇组装的证据，相比之下，Au 20 (PET) 15 (DG) 很容易组装成二聚体，这与三齿结合基序一致。从热分析和质量分析中推断出结合 Au 和未结合二甘醇二甲醚分子之间堆叠的证据。
更新日期：2022-06-20
中文翻译：
超稳定的硫醇盐/二甘醇二甲醚连接簇：Au20(PET)15(DG)2
报道了 Au 20 (PET) 15 (DG) 2 (PET = 苯硫醇; DG = 二甘醇二甲醚) 簇的合成和表征。质谱法显示这是第一个二甘醇二甲醚连接簇，其中二甘醇二甲醚配体在电离后进入气相。热分析表明簇在 156 °C 时降解，而类似的 Au 20 (PET) 16簇在 125 °C 时降解，表明热稳定性显着提高。NMR光谱和计算模型的结合表明，二甘醇二甲醚分子以三齿方式结合该簇，导致二甘醇二甲醚的结合能为35.2 kcal mol -1，与~40 kcal mol -1的值相当对于硫醇盐。IR 和光学光谱没有显示该簇组装的证据，相比之下，Au 20 (PET) 15 (DG) 很容易组装成二聚体，这与三齿结合基序一致。从热分析和质量分析中推断出结合 Au 和未结合二甘醇二甲醚分子之间堆叠的证据。
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