Matrix-Isolation IR Spectra of Halogen-P and Halogen-pi Complexes of Phosphines and Iodotrifluoroethylene (C2F3I)

Abstract

The C=C stretching mode of iodotrifluoroethylene (ITFE) serves as marker for halogen bonding (XB)-interactions in complexes with phosphines. The formation of a C-I•••P XB-complexes becomes evident from a strong red-shift of this marker band. The formation of C-I•••pi bound clusters, which were kinetically trapped in the cryogenic environment, were confirmed by a slightly smaller redshift of the marker band.