Fig. 3

Number of halogen bond interactions observed in bond angle regions. a, d, g Represent the number of interactions of C–Cl···O at angles 165°–180°, 150°–165°, 135°–150° respectively. b, e, h Represent the number of interactions of C–Br···O at angles 165°–180°, 150°–165°, 135°–150° respectively. c, f, i Represent the number of interactions of C–l···O at angles 165°–180°, 150°–165°, 135°–150° respectively