Structures and hydrogen bonding of 1,7-dioxaspiro[5.5]undecane and its hydrates
文献情報
Yugao Xu, Wenqin Li, Jiaqi Zhang, Tao Lu, Yan Jin, Gang Feng
The conformations of 1,7DSU and its stepwise solvation by up to 5 water molecules were explored using supersonic-jet Fourier transform microwave spectroscopy with the supplement of theoretical calculations. Experimentally, the rotational spectra of the most stable structures of the monomer, monohydrate and dihydrate were observed and assigned. The characteristics of the stability and intermolecular interaction topologies of the 1,7DSU monomer and its hydrated clusters were obtained by CREST conformational sampling followed by B3LYP-D3(BJ)/def2-TZVP geometrical optimizations and MP2/aug-cc-pVTZ single-point energy calculations. The first water molecule links to the 1,7DSU monomer through an OwH⋯O hydrogen bond. The water molecules tend to aggregate with each other and form cyclic structures for the n = 2–5 clusters. The interactions between water and the 1,7DSU monomer as well as those between water and water were revealed. The analyses of non-covalent interactions and the natural bond orbital suggest that the OwH⋯O1,7DSU, OwH⋯Ow, and CH⋯Ow hydrogen bonds play a prominent role in structural stability.
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