title: N lone-pair···π interaction: a rotational study of chlorotrifluoroethylene···ammonia.
abstract: The rotational spectra of four isotopologues of the adduct C2F3Cl-NH3 show that NH3 is bound to the partner molecule through a (N)lone-pair···π interaction. Ammonia is located in proximity to the C2 atom (the one linked to two fluorine atoms), with the C2···N distance = 2.987(2) Å. The nuclear hyperfine structure due to the quadrupole coupling effects of (35)Cl/(37)Cl and (14)N nuclei has been fully resolved. The (14)N quadrupole coupling constants allow estimating the effective orientation of NH3 in the complex.
authors.affiliation: Dipartimento di Chimica "G. Ciamician" dell'Università, Via Selmi 2, I-40126 Bologna, Italy. walther.caminati@unibo.it.
authors.forename: Qian
authors.initials: Q
authors.lastname: Gou
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Spada
authors.forename: Yannick
authors.initials: Y
authors.lastname: Geboes
authors.forename: Wouter A
authors.initials: WA
authors.lastname: Herrebout
authors.forename: Sonia
authors.initials: S
authors.lastname: Melandri
authors.forename: Walther
authors.initials: W
authors.lastname: Caminati