Synthesis and Electrostatic Nano-Assembly of Water-Soluble Polybenzothiadiazole Derivatives with Long-Wavelength Emission in the Solid States

Abstract

We have synthesized APBT and APTBT containing benzothiadiazole units by Suzuki cross-coupling reaction with good yield. The polymers showed blue emission colors in aqueous solutions, while long wavelength shift was observed in the solid state due to facilitated exciton migration. APBT and APTBT are water-soluble and highly-fluorescent conjugated polymers with negatively charged sulfonate side chains and thus they can be electrostatically assembled with oppositely charged polyelectrolyte such as cationic polymer, poly(dimethyldiallylammonium chloride) (PDAC) via layer-by-layer (LbL) deposition technique on a glass slide. According to the increased the number of bilayer, we found that the assembled film exhibited larger enhancement of the long wavelength emission relative to the blue emission, due to the increased excition migration.

A Protein Sensory System Comprising a Fluorescent Conjugated Polyelectrolyte and DNA Aptamer

“…본 연구에서는 특정 구조의 수용성 공액화 고분자가 회 합(aggregation)에 의하여 형광색이 변화하는 성질을 이용 하여 타겟 물질을 감지하는 새로운 시스템을 구현하였다 [18,19]. 회합에 의한 형광 변화는 동일 고분자 주쇄 내에 에너지 주개와 받개가 동시에 존재하는 구조적 특성에 기 인한다.…”