The C-F small middle dot small middle dot small middle dotH-C "Anti-Hydrogen Bond" in the Gas Phase: Microwave Structure of the Difluoromethane Dimer.
A shortening of the C-H bond lengths and a blue shift of the C-H stretching frequencies for the C-F small middle dot small middle dot small middle dotH-C groups indicates that anti-hydrogen bonds are present the difluoromethane dimer. The most stable conformer has three such interactions (shown schematically).
Caminati
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Dipartimento di Chimica "G. Ciamician" dell'Università, Via Selmi 2, I-40126 Bologna (Italy).
Melandri
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Moreschini
P
Favero
PG