Fig. 4: Structural rearrangement during the formation of the p(2 × 1)Keto-Ether5phase. The initial peroxide termination is along the C–C ridge in the \([1\overline{1}0]\) direction.
From: Coexistence of carbonyl and ether groups on oxygen-terminated (110)-oriented diamond surfaces
First, a the O–O bond breaks to form two oxygen radicals (O⋅), one of which then proceeds to form a double bond with a surface carbon atom (b). Due to the propensity of carbonyl groups to form trigonal planar structures, one of the C–C bonds in the tetrahedral diamond structure also breaks. Both processes are underway in the transition state (c). In order to form a stable structure, the remaining O⋅ bridges over the surface ridge to form an ether group, allowing the carbon radical (C⋅) to bond with another carbon atom behind the carbonyl (d). The resulting structure is the p(2 × 1)Keto-Ether5 phase (e). Surface axes are also presented.
