Study of the Halogen Bonding between Pyridine and Perfluoroalkyl Iodide in Solution Phase Using the Combination of FTIR and ¹⁹F NMR

Table 1

The magnitudes of the frequency blue shift in the ring breathing vibration of pyridine on the formation of halogen bonding with iso-C₃F₇I/1-C₃F₇I in various solvents (the concentrations of pyridine and perfluoroalkyl iodide are 0.2 M in all the solutions).

Solvent	Iso-C3F7I	1-C3F7I
Cyclohexane	8 ± 1 cm^−1	6 ± 1 cm^−1
Hexane	8 ± 1 cm^−1	6 ± 1 cm^−1
Chloroform	5 ± 1 cm^−1	4 ± 1 cm^−1
Acetone	9 ± 1 cm^−1	7 ± 1 cm^−1
Acetonitrile	9 ± 1 cm^−1	6 ± 1 cm^−1