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

rm: Single bond length of Carbon – Carbon.r′m: Single bond length of Carbon –Oxygen.r’‘m: Double bond length of Carbon – Carbon.rm/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.