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In 2013,Caminati and co-workers first investigated the microwave spectrum of the adduct of water with chlorotrifluoroethylene through lp…π interaction.Here we theoretically studied viable structures with tetrafluoroethylene-water and difluorodichloroethylene-water by MO6-2X/aug-cc-pVTZ method.The most stable conformers of C2F4…H2O and C2Cl2F2…H2O are predicted by lp…π interactions,about lower in energy 2 kcal/mol than those stabilized by a hydrogen bond or a halogen bond.The structure C2F4…H2O with rO…C1 = 2.864(A),OC1C2 = 107.7° and the structure C2Cl2F2…H2O with rO…C1 = 2.786(A),OC1C2 = 103.2°,are displayed in the below figure.