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

Abstract

Reaction of SeO₂ , tetramethylammonium (TMA) chloride, aqueous HCl and Cl₂ yields oxochloroselenate with incorporated Cl₂ units, TMA₃ {[Se₂ O₂ Cl₇ ](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.