Rotational Spectroscopy Meets Quantum Chemistry for Analyzing Substituent Effects on Non-Covalent Interactions: The Case of the Trifluoroacetophenone-Water Complex.

Rotational Spectroscopy Meets Quantum Chemistry for Analyzing Substituent Effects on Non-Covalent Interactions: The Case of the Trifluoroacetophenone-Water Complex.
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旋转光谱与量子化学相结合,分析取代基对非共价相互作用的影响:以三氟苯乙酮-水络合物为例

DOI:
10.3390/molecules25214899
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发表时间:
2020-10-23
期刊:
Molecules (Basel, Switzerland)
影响因子:
--
通讯作者:
Barone V
Barone V
中科院分区:
其他
文献类型:
--
作者:
Lei J;Alessandrini S;Chen J;Zheng Y;Spada L;Gou Q;Puzzarini C;Barone V

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由2,2,2-三氟苯乙酮和水形成的1:1络合物的最稳定的异构体的特征在于结合超声膨胀中的旋转光谱和最先进的量子化学计算。在观察到的异构体中,水扮演质子供体和受体的双重角色,从而与2,2,2-三氟苯乙酮形成七元环。用平衡结构的半实验方法确定了一个典型的O-H···O氢键和一个弱的C-H···O氢键的精确分子间参数。此外,通过不同的键分析,揭示了已建立的非共价相互作用的性质。与苯乙酮与水形成的类似络合物的比较指出了氟原子在调节非共价相互作用中所起的显着作用。
The most stable isomer of the 1:1 complex formed by 2,2,2-trifluoroacetophenone and water has been characterized by combining rotational spectroscopy in supersonic expansion and state-of-the-art quantum-chemical computations. In the observed isomer, water plays the double role of proton donor and acceptor, thus forming a seven-membered ring with 2,2,2-trifluoroacetophenone. Accurate intermolecular parameters featuring one classical O-H···O hydrogen bond and one weak C-H···O hydrogen bond have been determined by means of a semi-experimental approach for equilibrium structure. Furthermore, insights on the nature of the established non-covalent interactions have been unveiled by means of different bond analyses. The comparison with the analogous complex formed by acetophenone with water points out the remarkable role played by fluorine atoms in tuning non-covalent interactions.
DOI: 10.1063/1.1136443
发表时间: 1981-01-01
影响因子: 1.6
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