Conjugated polymer containing isoindigo units, preparation method and use thereof

A method of preparing a conjugated polymer containing isoindigo units, comprising the steps of,

• providing a compound A with the following structure:
• and compound Ar is selected one from the group consisting of
• wherein R1 represents C8 to C20 alkyl, R2 represents C1 to C12 alkyl, n represents an integer from 2 to 50;
• in an anaerobic environment, applying a mixture of organic palladium and organic phosphine ligand as catalyst, and the molar ratio between the organic palladium and organic phosphine ligand is 1:2 to 1:20;
• mixing compound A and compound Ar in organic solvent for Heck reaction, then obtaining a conjugated polymers containing isoindigo units with the following structural formula:
• wherein, Ar is selected one from the group consisting of
• R1 represents C8 to C20 alkyl;
• R2 represents C1 to C12 alkyl;
• n represents an integer from 2 to 50;
• the reaction equation is: