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在冷和矩阵中的SH···SH结合乙乙醇集群:一项IR光谱研究
Ankita Kothari1, Biman Bandyopadhyay1
1Department of Chemistry, Malaviya National Institute of Technology Jaipur, Jaipur, India.
概括
这项研究使用矩阵隔离光谱学和计算方法研究了乙乙醇 (EtSH) 的二元和三元结构. 我们确定了多个稳定对应物,揭示了键强度和稳定性之间的关系,EtSH集群显示了显著的分散相互作用.
科学领域:
- 物理化学 物理化学
- 频谱学是一种光谱学.
- 计算化学的计算化学
背景情况:
- 键在分子相互作用和材料特性中起着至关重要的作用.
- 了解小分子的结构性行为对于各种化学和生物过程至关重要.
研究的目的:
- 为了实验性地表征S−H···S联乙乙醇 (EtSH) 的二聚体和三聚体对应物.
- 阐明EtSH集群中分子构造,键强度和稳定性之间的关系.
- 将EtSH集群中的相互作用动态与硫化 (H2S) 集群中的相互作用动态进行比较.
主要方法:
- 在和矩阵中进行矩阵隔离光谱学.
- 对S−H拉伸频率 () 区域进行分析.
- 量子化学计算 (ωB97X-D/aug-cc-pV(D + d) Z) 用于结构分析和频率预测.
主要成果:
- 在两种矩阵中观察到EtSH二分体和三分体的20多个光谱带,具有显著的光谱转移.
- 计算预测了24个二次体和45个三次体的合体;16个二次体和9个三次体被实验确定.
- 大多数稳定的适配体表现出较弱,较长的S−H···S键,而较不稳定的则表现出较强,较短的键.
- 与H2S集群相比,EtSH集群显示出分散相互作用的贡献更大.
结论:
- EtSH二分体和三分体的结构格局复杂,相对稳定性显示微小的变化.
- 观察到的光谱变化与计算的频率相关,验证了理论模型.
- 分散力在稳定乙乙醇集群中起着重要作用,使其与更简单的硫化集群区别开来.
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