Halogen-halogen interaction in view of many-body approach

- Cyclic tetramer consisting of four H3C-Br molecules is stabilized via halogen bonds.
- Each Br atom plays a dual role of Lewis acid and Lewis base.
- The many-body interaction energy decomposition was used.
- The cooperativity effect due to tetramer formation is meaningless.
- Various BSSE schemes were tested for interaction energy and its components.