The first two examples of halogen bonding with a sigma hole-donating fluorine in the C sp3 –F⋯O sp3 interaction from polyfluorinated trans -dihalo-palladium( ii ) di-substituted pyridine complexes

The first two examples of halogen bonding in the C sp3 –F⋯O sp3 interaction have been both experimentally and theoretically proved for trans -[PdX 2 (3-HCF 2 CF 2 CH 2 OCH 2 py) 2 ] complexes where X = Cl and Br. Both metal complexes with a C sp3 –F⋯O sp3 halogen bond have a σ hole donating fluorine.