A Soluble Poly(arylene) with Large Degree of Depolarization. Poly(2,5-pyridinediyl) Prepared by Dehalogenation Polycondensation of 2,5-Dibromopyridine with Ni(0)-Complexes

Abstract

Poly(2,5-pyridinediyl) was prepared by dehalogenation polycondensation of 2,5-dibromopyridine with Ni(0)-complexes. The polymer was soluble in formic acid, and the solution showed λmax at about 370 nm and large degree of depolarization.

Achieving a Stable Time Response in Polymeric Radiation Sensors under Charge Injection by X-rays

“…PTAA with weight-average molecular weight (M w ) of 31 kg/mol and a polydispersity (PDI) index (M w /M n ) of 2.07 was synthesized by a method described elsewhere in the literature (27). The details of the device preparation can be found elsewhere (23).…”

Synthesis and optical properties of blue luminescent poly(2,6‐naphthalene)s

“…16 The homopolymer (2a) was prepared by Yamamoto polycondensation of corresponding dibromonaphthalene using Ni(cod) 2 in a mixture of DMF and THF. 22,23 The copolymers (3a-b) were prepared by Suzuki coupling reaction of dibromonaphthalene with 1,4-phenylenediboronic acid ester in mixture of toluene and aqueous K 2 CO 3 solution. [24][25][26] Other Chemicals used in this study were purchased from Nacalai Tesque, Kanto Chemicals, Tokyo Kasei, and Aldrich Chemical.…”

Influence of surfactant concentration on counter-ion induced solubility of poly(pyridine-2,5-diyl)

“…Dodecybenzenesulfonic acids and camphorsulphonic acid were purchased from Aldrich Chemical Co. Inc. Bis (1,5-cyclooctadiene) (Yamamoto, 2002;Yamamoto et al, 1988;1994).…”

“…The synthesis of poly(pyridine-2,5-diyl) was based on a method reported by our group as shown in Fig.1 (Yamamoto et al, 1988;1994). In a typical preparation, a mixture of 2,5-dibromopyridine and the Ni(0) complex (1.0~1.2 mol/mol of the monomer) in a solution of N,N-dimethylformamide (DMF) at 60 °C yielded a yellowish orange precipitate of PPY.…”

“…The precipitate was washed repeatedly with hot toluene, warm aqueous solutions (pH=3) of Ethylenediamine tetraacetic acid (EDTA), warm aqueous solutions (pH=9) of EDTA, warm aqueous solutions (pH=9) of NaOH, hot water, and hot methanol, and dried under vacuum; yield was about 90%. PPY thus obtained was reported to have a molecular weight of 4300 g/mol and is constituted of a random mixture of head-to-tail and head-to-head units (Yamamoto et al, 1988).…”