Introduction

Preparation of New Main-Chain Type Polyanthraquinones. Chemical Reactivity, Packing Structure, Piezochromism, Conductivity, and Liquid Crystalline and Photonic Properties of the Polymers

“…the Experimental Section and Supporting Information). Because IR spectra of P(5,8-OH-1,4-AQ) and P(4,8-OH-1,5-AQ) showed no peak assigned to ν(CO) of the OAc group at about 1750 cm -1 and resembled those of the corresponding dihydroxy-anthraquinones, the OAc group was considered to be transformed into the OH group according to cleavage of the acetoxyphenyl bond in the reaction with Ni(0)Lm12a during the polymerization and/or reactions that occurred during the workup including washing with hydrochloric acid.…”

“…P(5,8-OR-1,4-AQ)s showed only low content of Cl, and P(5,8-OC 6 H 13 -1,4-AQ) showed no Cl. The as-prepared P(5,8-OC 6 H 13 -1,4-AQ) is considered to have Ni-terminated polymer ends, which are converted into H-terminated polymer ends during workup using protic acid, similar to polyarylenes prepared analogously 12b …”

“…1 H NMR spectra of polymers often give complicated absorption patterns for various reasons (e.g., due to difference in conformation of the polymer and regio- and stereo- regularity). 12c,d, P(5,8-OR-1,4-AQ) also exhibits a complex 1 H NMR pattern which, for example, gives two −OCH 2 − peaks at δ 4.05 and 3.72 for P(5,8-OC 16 H 33 -1,4-AQ) (cf. the Supporting Information).…”

“…Electronic effect of P(5,8-OC 12 H 25 -1,4-AQ) may also affect the direction of alignment. Alignment of π-conjugated polymers on substrates has been the subject of recent interest. 8b,,12b,,

4 Dichroism caused by P(5,8-OC 12 H 25 -1,4-AQ) molecules laid on a rubbed polyimide film; after annealing at 170 °C for 1 h. These UV−vis dichroic data suggest alignment of P(5,8-OC 12 H 25 -1,4-AQ) in the (α) mode shown in the top part of the figure. Inset: Analogous data for poly(9,9-bis(2-ethylhexyl) fluorine-2,7-diyl) laid on the same rubbed polyimide film.

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