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π-Conjugated polymers based on indigo unit were prepared. Dehalogenative polycondensation of N -hexyl-6,6'-dibromoindigo with a zerovalent nickel complex gave a homopolymer, P(HexI) , in 77% yield. Copolymer of N -hexyl-indigo and pyridine, P(HexI-Py) , was also prepared in 50% yield. P(HexI) showed good solubility in organic solvents, whereas P(HexI-Py) was only soluble in acids such as HCOOH. The weight-average molecular weights ( M  w ) of P(HexI) and P(HexI-Py) were determined to be 10,000 and 40,000, respectively, by a light scattering method. Pd-catalyzed polycondensation between 6,6'-dibromoindigo with N -BOC (BOC = t -butoxycarbonyl) substituents and a diboronic compound of 9,9-dioctylfluorene afforded the corresponding alternating copolymer, P(BOCI-Flu) , as a deep red solid in 98% yield. P(BOCI-Flu) was soluble in N -methyl-2-pyrroridone and showed an M  w of 29,000 in GPC analysis. Treatment of P(BOCI-Flu) with CF₃COOH smoothly led to a BOC-deprotection reaction to give an insoluble deep green polymer, P(I-Flu) , in a quantitative yield. Diffuse reflectance spectra of powdery P(BOCI-Flu) and P(I-Flu) showed peaks at about 580 nm and 630 nm, respectively, which are thought to originate from the indigo unit.

Preparation and Chemical Properties of π-Conjugated Polymers Containing Indigo Unit in the Main Chain