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Reaction of SeO2, tetramethylammonium (TMA) chloride, aqueous HCl and Cl2 yields oxochloroselenate with incorporated Cl2 units, TMA3{[Se2O2Cl7](Cl2)}. The main feature of this compound is the strong (up to 3.5 kcal mol−1, according to DFT calculations) Cl⋅⋅⋅Cl bonding, which is also detected by Raman spectroscopy.