The interatomic distance between the different atoms of PEG solid state M = 200 and 1000.

r_m: Single bond length of Carbon – Carbon.

r′_m: Single bond length of Carbon –Oxygen.

r’‘_m: Double bond length of Carbon – Carbon.

r_m/r₁: Geometrical factor.

The absence of √2 diameter and presence of the geometrical factor corresponds to ∼√3 and ∼2 diameter demonstrates the presence of an irregular unit cell with icosahedral symmetry (Frank unit) in solid state PEG.

The interatomic distance between the different atoms of PEG solid state M = 200 and 1000.