在侧面和端面Cu2(S2) 内核中的光谱和粘合:与过氧化物类似物进行比较
Peng Chen1, Kiyoshi Fujisawa, Matthew E Helton
1Contribution from the Department of Chemistry, Stanford University, Stanford, California 94305, USA.
Journal of the American Chemical Society
|June 6, 2003
概括
这项研究表明,与铜氧化物对应物相比,在铜氧化物复合物中,铜氧化物键更强,硫键更弱. 这些发现对于理解化学中的金属硫相互作用至关重要.
科学领域:
- 无机化学 无机化学 有机化学
- 生物有机化学 生物有机化学
- 频谱学是一种光谱学.
- 计算化学计算化学
背景情况:
- 铜二硫化物复合物在结构和电子上与铜氧化物复合物相似,为金属-连接体结合提供了洞察力.
- 了解金属-硫和金属-氧键的性质对于各种化学和生物过程至关重要.
研究的目的:
- 为了研究二硫化联体和Cu (II) 离子在侧面和端端桥接复合体之间的结合相互作用.
- 用光谱和计算方法将这些相互作用与类似过氧化物复合物的相互作用进行比较.
- 阐明控制金属-连接体和连接体-连接体键的相对强度的电子因素.
主要方法:
- 用密度函数计算来建模复合体的电子结构.
- 共振拉曼光谱被用来探测振动频率和结合特征.
- 紫外线-Vis吸收光谱提供了有关电子转换的信息.
主要成果:
- 与过氧化物类似物相比,二硫化物复合物表现出较弱的S-S键和更强的Cu-S键.
- 侧向桥梁复合体在它们的基本状态中显示出比端向桥梁复合体更大的协同性,这是由于增强的西格玛-捐赠者相互作用.
- 在侧面复合体中发现了连接物西格玛背接,显著削弱了S-S/O-O键.
结论:
- 铜二硫化物复合物的电子结构和结合与它们的过氧化物对应物有很大不同,特别是在共价度和联-联结合强度方面.
- 侧面协调导致更强的金属连接体键和较弱的二硫化物键,由于增加了西格玛捐赠和背接.
- 这些发现提供了有关催化和生物活动的金属硫系统的反应性和性能的基本见解.
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