Chemistry · Ch 9 — Hydrogen
Structure
Structure
Molecular Structure
Hydrogen peroxide is a non-planar molecule. It is often pictured as an open book: two H–O–O planes hinged along the central O–O bond, at some dihedral (book-opening) angle to each other.
Gas phase (Fig 9.3a): O–H bond length 95.0 pm, O–O bond length 147.5 pm, H–O–O bond angle 94.8°, dihedral angle 111.5°. …
What this figure shows. Two side-by-side blue-shaded 3-D open-book / wedge diagrams of the non-planar H2O2 molecule, each showing two O atoms joined by an O-O bond with one H atom attached to each O, the two H-O-O planes shown as two shaded triangular 'pages' hinged along the O-O bond (like a half-open book), captioned '(a) Gas phase' under the left diagram and '(b) Solid phase' under the right diagram. Left diagram (a): labelled bond length 'O-H = 95.0 pm', 'O-O = 147.5 pm', bond angle at one O '94.8°', and the dihedral (book-opening) angle marked '111.5°' between the two shaded planes. Right diagram (b): labelled 'O-H = 98.8 pm', 'O-O = 145.8 pm', bond angle '101.9°', and dihedral angle '90.2°' — the solid-phase diagram's two shaded planes are folded closer together (smaller dihedral angle) than the gas-phase on …