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By MIshra, Siba Prasad

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The non-bonded hydroxyl groups on a single molecule will tend to form hydrogen bonds with acceptor compounds coming nearer than 3 Å. If the ring planes are parallel to each other, the elementary fibril is constrained by three different forces, which tend to hold the cellulose structures together. e. covalent bonds in the main chain, (b) Hydrogen bonds extending sideways from the rings and (c) Dispersion forces perpendicular to ring planes. 3 Structure of cellulose molecule. 610 Cellulose molecules have the ability to crystallize into different polymorphic forms.

Van der Waals forces are usually two types like polarization forces and dispersion forces. The polarization forces are the attraction of molecules by permanent dipoles and by induced dipoles. indd 42 2/15/2016 9:34:57 AM Crystalline structure 43 the interaction of hydrophobic groups, especially alkyl chains to associate together and escape from an aqueous environment. A hydrogen bond is the electrostatic attraction between polar molecules that occurs when a hydrogen (H) atom bound to a highly electronegative atom such as nitrogen (N), oxygen (O) or fluorine (F) experiences attraction to some other nearby highly electronegative atom.

Ii) Geometric isomerism Geometric isomerism is because of the spatial arrangement of groups and atoms. The locking into the spatial positions occurs because of a double bond or a ring structure. The isomerism in which identical groups or atoms are closer or same side is known as cis-form and the other, in which they are remote is called trans-form. Both these words are Latin words where cis means on this side and trans means across. Because of the restricted rotation around the double bond, different isomers exist with particular groups on the same side or on the opposite side of the double bond.

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