Structure
Cl2O7 is an endothermic molecule, which means that it is intrinsically unstable.
- 2 Cl2O7 → 2 Cl2 + 7 O2 (ΔH = -135 kJ/mol)
Cl2O7 is bent with Cl-O-Cl angle of 118.6° giving the molecule C2 symmetry. The terminal Cl-O distances are 1.709 Å and the Cl=O distances are 1.405 Å. In this compound, chlorine exists in its highest formal oxidation state of +7, although the bonding in this molecule is significantly covalent.
Read more about this topic: Dichlorine Heptoxide
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