Rotational spectra of several difluoromethane-water adducts have been observed using two broadband chirped-pulse Fourier-transform microwave (CP-FTMW) spectrometers. The experimental structures of (CH2 F2 )⋅⋅⋅(H2 O)2 , (CH2 F2 )2 ⋅⋅⋅(H2 O), (CH2 F2 )⋅⋅⋅(H2 O)3 , and (CH2 F2 )2 ⋅⋅⋅(H2 O)2 were unambiguously identified with the aid of 18 isotopic substituted species. A subtle competition between hydrogen, halogen, and carbon bonds is observed and a detailed analysis was performed on the complex network of non-covalent interactions which stabilize each cluster. The study shows that the combination of stabilizing contact networks is able to reinforce the interaction strength through a cooperative effect, which can lead to large stable oligomers.
Keywords: difluoromethane; molecular clusters; non-covalent interactions; quantum-chemical calculations; rotational spectroscopy.
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