Halide adducts of 1,3,5-trinitrobenzene: Vibrational signatures and role of anion-π interactions

- Fluoride and chloride complexes with 1,3,5-trinitrobenzene (TNB) are obtained.
- TNB-F− conforms to a strongly covalent σ-complex structure.
- TNB-Cl− displays an off-center binding of chlorine, described as weakly covalent.
- Also TNB-I− and TNB-Br− present IR features consistent with a weak σ-binding motif.