Summary
Novel poly(ethynylene-phenylene-ethynylene-borane)s were prepared by polycondensation between bifunctional lithium acetylide and aryldimethoxyborane. The polymers obtained are expected as a novel type of organoboron π-conjugated polymers via vacant p-orbital of boron atom. The polymerization between dilithium 2,5-didodecyloxybenzene- 1,4-diethynilide and tripyldimethoxyborane [tripyl=2,4,6-triisopropylphenyl] gave the corresponding polymer in 67% yield. From gel permeation chromatographic analysis (THF, PSt standards), the number-average molecular weight of the polymer was found to be 2700. In the UV-vis spectrum of the polymer (in chloroform at room temperature), an absorption maximum was observed at 397 nm. The fluorescence emission spectrum (in chloroform, room temperature, excitation wavelength at 400 nm) showed its λmax at 456 nm in the visible blue region. The polymers obtained were very soluble in common organic solvents such as THF, chloroform and benzene.
Similar content being viewed by others
Author information
Authors and Affiliations
Additional information
Received: 11 April 2000/Accepted: 22 April 2000
Rights and permissions
About this article
Cite this article
Matsumi, N., Umeyama, T. & Chujo, Y. Novel π-conjugated organoboron polymers: Poly (ethynylene-phenylene-ethynylene-borane)s. Polymer Bulletin 44, 431–436 (2000). https://doi.org/10.1007/s002890070062
Issue Date:
DOI: https://doi.org/10.1007/s002890070062