Departamento de Quimica and Centro de Neurociencias e Biologia Celular, Universidade de Coimbra, 3004-535 Coimbra, Portugal.
ACS Appl Mater Interfaces. 2009 Apr;1(4):864-74. doi: 10.1021/am800267n.
Two anionic fluorene-thiophene alternating copolymers, poly[9,9-bis(4-sulfonylbutoxyphenyl)fluorene-2,7-diyl-2,5-thienylene] (PBS-PFT) and poly[9,9-bis(4-sulfonylbutoxyphenyl)fluorene-2,7-diyl-2,2'-bithiophene-5,5'-diyl] (PBS-PF2T), have been synthesized and their solution behaviors in water studied by UV-vis absorption spectroscopy, fluorescence, and electrical conductivity and compared with that of the previously studied conjugated polyelectrolyte (CPE) poly[9,9-bis(4-sulfonylbutoxyphenyl)fluorene-2,7-diyl-1,4-phenylene] (PBS-PFP). These conjugated polymers do not form solutions at the molecular level in water but instead form clusters. Information on the structure of these clusters for PBS-PF2T comes from small-angle X-ray and neutron scattering. The relative ease of dispersing the copolymers in water increases with an increase in the number of thiophene rings in these alternating copolymers. Semiempirical calculations on the structure suggest that this results from bending of the chains and increased conformational flexibility, decreasing interchain interactions. These CPEs can be dissolved in water at the molecular level using the nonionic surfactants n-dodecylpentaoxyethylene glycol ether (C12E5) or Triton X-100 to obtain systems with increased photoluminescence quantum yield and increased electrical conductivity that can be solution-processed for potential applications as components of sensory or optoelectronic devices.
两种阴离子性芴-噻吩交替共聚物，聚[9,9-双(4-磺酰基丁氧基)芴-2,7-二基-2,5-噻吩]（PBS-PFT）和聚[9,9-双(4-磺酰基丁氧基)芴-2,7-二基-2,2'-联噻吩-5,5'-二基]（PBS-PF2T），已经被合成出来，并通过紫外-可见吸收光谱、荧光和电导率研究了它们在水中的溶液行为，与之前研究的共轭高分子电解质（CPE）聚[9,9-双(4-磺酰基丁氧基)芴-2,7-二基-1,4-亚苯基]（PBS-PFP）进行了比较。这些共轭聚合物在水中不能以分子水平形成溶液，而是形成聚集体。关于 PBS-PF2T 这些聚集体结构的信息来自小角 X 射线和中子散射。这些交替共聚物中噻吩环数目的增加增加了共聚物在水中分散的相对容易程度。对结构的半经验计算表明，这是由于链的弯曲和构象灵活性的增加，减少了链间相互作用。这些 CPE 可以使用非离子表面活性剂 n-十二基五氧乙烯基醚（C12E5）或 Triton X-100 在分子水平上溶解在水中，以获得具有增加的光致发光量子产率和增加的电导率的体系，这些体系可以溶液加工，用于作为敏感或光电设备组件的潜在应用。
