Premium
A Borinic Acid Polymer with Fluoride Ion‐ and Thermo‐responsive Properties that are Tunable over a Wide Temperature Range
Author(s) -
Wan WenMing,
Cheng Fei,
Jäkle Frieder
Publication year - 2014
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201403703
Subject(s) - upper critical solution temperature , fluoride , chemistry , polymer , polymer chemistry , atmospheric temperature range , ion , ionic bonding , chemical engineering , ionic liquid , inorganic chemistry , organic chemistry , lower critical solution temperature , copolymer , thermodynamics , physics , engineering , catalysis
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 R 2 BOH groups are converted into ionic [R 2 BF 2 ] − groups, but turns insoluble again upon addition of H 2 O, which reverses this process.