Polymerisable thieno[3,2-b]thiophenes

A compound of formula I

• R3-(A)a-(B)b-(C)c-(D)d-(E)e-R4 I
• wherein
• A, B, C, D and E are independently of each other a TT group of formula II
• or are selected from phenylene-1,4-diyl that is optionally substituted by one or two R1 groups that are different than H, thiophene-2,5-diyl that is optionally substituted by one or two R1 groups that are different than H, selenophene-2,5-diyl that is optionally substituted by one or two R1 groups that are different than H, and naphthalene-2,6-diyl that is optionally substituted by one or two R1 groups that are different than H,
• R1 and R2 independently of each other are each H, halogen, P-Sp-, P*-Sp, or straight chain, branched or cyclic alkyl with 1 to 20 C-atoms, which may be unsubstituted, mono- or polysubstituted by F, Cl, Br, I or CN, and wherein one or more non-adjacent CH2 groups are each independently optionally replaced by —O—, —S—, —NH—, —NR0—, —SiR0R00—, —CO—, —COO—, —OCO—, —O—CO—O—, —S—CO—,—CO—S—, —CX1═CX2— or —C≡C— in such a manner that O and/or S atoms are not linked directly to one another,
• R3 and R4 are independently of each other P-Sp-, P*-Sp-, H, halogen, or straight chain, branched or cyclic alkyl with 1 to 20 C-atoms, which may be unsubstituted, mono- or polysubstituted by F, Cl, Br, I or CN, and wherein one or more non-adjacent CH2 groups are each independently optionally replaced by —O—, —S—, —NH—, —NR0—, —SiR0R00—, —CO—, —COO—, —OCO—, —O—CO—O—, —S—CO—, —CO—S—, —CX1═CX2— or —C≡C— in such a manner that O and/or S atoms are not linked directly to one another, with at least one of R3 and R4 being P-Sp- or P*-Sp-,
• X1 and X2 are independently of each other H, F, Cl or CN,
• P is CH2═CH—COO—, CH2═C(CH3)—COO—, CH2═CH—, CH2═CH—O—, (CH2═CH)2CH—OCO—, (CH2═CH)2CH—O—
• k1 is 0 or 1,
• P* is —OH or —O—Si—R0R00R000,
• Sp is a spacer group or a single bond,
• R0, R00 and R000 are independently of each other H, alkyl with 1 to 12 C-atoms or aryl, and
• a, b, c and d are independently of each other 0, 1, 2 or 3, with a+b+c+d >0;
• wherein the compound comprises two or three TT groups, or the compounds comprise one, two or three TT groups and one, two, three or four groups selected from phenylene-1,4-diyl, thiophene-2,5-diyl, selenophene-2,5-diyl, and naphthalene-2,6-diyl which in each case is optionally substituted by one or two R1 groups that are different than H, and
• wherein said compound is oxidatively or reductively doped to form a conducting ionic species.