title: Interaction between freons and amines: the C-H···N weak hydrogen bond in quinuclidine-trifluoromethane.
abstract: The 1:1 complex between quinuclidine and trifluoromethane has been investigated using pulsed jet Fourier transform microwave spectroscopy. The two constituting molecules are held together through a weak C-H···N hydrogen bond, with a H···N length of 2.070(1) Å. The C3 symmetric axes of the two moieties are collinear, making the overall molecular system a symmetric top. The HCF3 subunit is freely rotating with respect to the amine moiety. Transitions for the ground (m = 0) and for the first excited (|m| = 1) torsional states, with K up to 2, have been measured, all of them showing the (14)N nuclear quadrupole hyperfine structure. The dissociation energy of the complex has been estimated to be 10.2 kJ mol(-1).
authors.affiliation: Dipartimento di Chimica "G. Ciamician" dell'Università , Via Selmi 2, I-40126 Bologna, Italy.
authors.forename: Qian
authors.initials: Q
authors.lastname: Gou
authors.forename: Gang
authors.initials: G
authors.lastname: Feng
authors.forename: Luca
authors.initials: L
authors.lastname: Evangelisti
authors.forename: Walther
authors.initials: W
authors.lastname: Caminati