Department of Chemistry, Rutgers University-Newark, 73 Warren Street, Newark, NJ 07102 (USA) http://chemistry.rutgers.edu/fjaekle.
Angew Chem Int Ed Engl. 2014 Aug 18;53(34):8934-8. doi: 10.1002/anie.201403703. Epub 2014 Jul 1.
A new type of smart borinic acid polymer with luminescence and multiple stimuli-responsive properties is reported. In DMSO with small amounts of water, the homopolymer PBA shows a tunable upper critical solution temperature (UCST). As the amount of water increases from 0 to 2.5 % (v/v), the UCST rises linearly from 20 °C to 100 °C (boiling point of water). Thus, the thermal responsive behavior can be tuned over a wide temperature range. Furthermore, polymer solutions in DMSO show a reversible response to fluoride ions, which can be correlated to the presence of the Lewis acidic borinic acid groups. Upon addition of fluoride, the polymer becomes soluble because the functional R2BOH groups are converted into ionic R2BF2 groups, but turns insoluble again upon addition of H2O, which reverses this process.
本文报道了一种具有发光性能和多重刺激响应特性的新型智能硼酸聚合物。在含有少量水的 DMSO 中，均聚物 PBA 表现出可调上临界溶解温度 (UCST)。随着水量从 0 增加到 2.5%（体积比），UCST 从 20°C 线性上升到 100°C（水的沸点）。因此，热响应行为可以在很宽的温度范围内进行调节。此外，DMSO 中的聚合物溶液对氟离子表现出可逆响应，这与路易斯酸性硼酸基团的存在有关。加入氟离子后，由于功能性 R2BOH 基团转化为离子 R2BF2基团，聚合物变得可溶，但再加入 H2O 后又变得不溶，从而使该过程发生逆转。
