Halogen-Halogen Links and Internal Dynamics in Adducts of Freons.
The pulsed jet Fourier transform microwave spectrum of the 1:1 complex between CF3Cl and CH3F shows that the two moieties are linked by a Cl···F halogen bond (RCl···F = 2.995 Å). The two symmetric tops CF3 and CH3 undergo free or almost free internal rotations, which alter the "rigid" value of the rotational constant A by almost 1 order of magnitude.
†Dipartimento di Chimica, "G. Ciamician" dell'Università, Via Selmi 2, I-40126 Bologna, Italy.
Qian
Q
Gou
†Dipartimento di Chimica, "G. Ciamician" dell'Università, Via Selmi 2, I-40126 Bologna, Italy.
Lorenzo
L
Spada
‡Departamento de Quı́mica Fı́sica, Facultad de Ciencia y Tecnologı́a, Universidad del Paı́s Vasco (UPV-EHU), Apartado 644, E-48940 Bilbao, Spain.
Emilio J
EJ
Cocinero
†Dipartimento di Chimica, "G. Ciamician" dell'Università, Via Selmi 2, I-40126 Bologna, Italy.
Walther
W
Caminati
freons; halogen bond; large-amplitude motions; microwave spectroscopy; supersonic expansions