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- Title
Enhanced Macroanion Recognition of Superchaotropic Keggin Clusters Achieved by Synergy of Anion–π and Anion–Cation Interactions.
- Authors
Qi, Bo; An, Sai; Luo, Jiancheng; Liu, Tianbo; Song, Yu‐Fei
- Abstract
Keggin clusters are the most widely used polyoxometalate building blocks for the construction advanced materials, but effective methods for precisely recognizing the isostructural analogues of Keggins are still limited. In this study we employed the zwitterionic molecule 4,4′‐dipyridyl N,N′‐dioxide as a recognition receptor to specifically bind to the three Keggin analogues PW12O403−, PMo12O403−, and SiW12O404−, which separately co‐assembled into three different types of spherical charged colloids of different sizes. The recognition phenomena were confirmed by electrochemical methods and their crystallization behavior. Compared with solely anion–cation interaction‐driven systems, the synergism with the anion–π interactions between the superchaotropic Keggins and the electron‐deficient pyridine rings is believed to enhance the recognition. This observation is intriguing as the long‐range solution assembly of Keggins is mainly driven by short‐range anion–π interactions. Our results show that the little‐noticed hydration shell of Keggins is significantly influenced by the superchaotropic effect, leading to differentiated binding affinity to the receptors and more obvious recognition phenomena between tungsten/molybdenum Keggin analogues.
- Subjects
ELECTROCRYSTALLIZATION; MOLECULAR recognition; BUILDING design &; construction; CONSTRUCTION materials
- Publication
Chemistry - A European Journal, 2020, Vol 26, Issue 70, p16802
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.202003083