Narrow band gap conjugated polymers employing cross-conjugated donors useful in electronic devices

A narrow band gap conjugated polymer prepared by copolymerizing at least one first donor monomer or oligomer having the formula:

• wherein G is a leaving group suitable for a cross-coupling polymerization reaction,
• FG is selected from the group consisting of unsubstituted C0-C36 hydrocarbyl, substituted C1-C36 hydrocarbyl, unsubstituted C6-C20 aryl, substituted C6-C20 aryl, unsubstituted C3-C20 heteroaryl, substituted C3-C20 heteroaryl, C6-C20 arylene substituted with a C1-C36 hydrocarbyl, F, Cl, Br, I, CN, —R2, SR2—OH, —OR2, —COOH, —COOR2, —NH2, —NHR2, or NR2R3, where R2 and R3 are independently selected from a C1-C24 hydrocarbyl group;
• FG′ is selected from the group consisting of unsubstituted C6-C20 aryl, substituted C6-C20 aryl, unsubstituted C3-C20 heteroaryl, substituted C3-C20 heteroaryl, unsubstituted hydrocarbyl, and substituted hydrocarbyl;
• and
• when FG′ is the unsubstituted hydrocarbyl or the substituted hydrocarbyl, FG cannot be C0-hydrocarbyl;
• m is an integer of at least 1;
• Y is selected from the group consisting of S, BR3, PR3, Se, Te, NH, or Si, wherein R3 is a C1-C24 hydrocarbyl group;
• with at least one acceptor second monomer selected from a)-b) that provide a structural unit in the copolymer:
• a) substituted and unsubstituted monomers derived from the group consisting of thiadiazoloquinoxaline, quinoxaline, thienothiadiazole, thienopyridine, thienopyrazine, pyrazinoquinoxaline, benzothiadiazole, bis-benzothiadiazole, benzobisthiadiazole, thiazole, thiadiazolothienopyrazine, thiadiazoloquinoxaline and diketopyrrolopyrrole, and
• b) monomers selected from the group consisting of:
• and;
• wherein the conjugated polymer has a band gap of 0.1 to 1.2 eV.