Oxochloroselenate(IV) with Incorporated {Cl2}: The Case of Strong Cl···Cl Halogen Bonding.

Reaction of SeO 2 , tetramethylammonium (TMA) chloride, aqueous HCl and Cl 2 yields in oxochloroselenate with incorporated Cl 2 units, TMA 3 {[Se 2 O 2 Cl 7 ](Cl 2 )} ( 1 ). The main feature of 1 is the strong (up to 3.5 kcal/mol, according to DFT calculations) Cl···Cl bonding, which is also detected by Raman spectroscopy.

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