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Reversible stimulus-responsive coordination polymers mainly involving conversion between the lone-pair–π and cation–π interactions.
- Source :
-
Journal of Coordination Chemistry . Mar2020, Vol. 73 Issue 5, p854-866. 13p. 7 Diagrams, 2 Charts, 3 Graphs. - Publication Year :
- 2020
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Abstract
- A new 3-position substituted imidazo[1,2-a]pyridine ligand, 4-(2-chloroimidazo[1,2-a] pyridine-3-carboxamido)phthalic acid (H2L), was conveniently synthesized and acts as a three-connecting T-shaped building block. Based on this ligand, two isostructural coordination polymers, [ML(H2O)]n (M = Zn (1) and Co (2)) with a rare one-dimensional (1D) ladder-like chain structure, were solvothermally synthesized and structurally characterized. There exist hydrogen bond and lone-pair–π interactions between two adjacent ladder chains. Compared to the H2L ligand, coordination polymer 1 reveals a blue-shifted emission stemming from ligand-to-metal charge transfer, meanwhile, coordination polymer 2 presents a dominant antiferromagnetism. Interestingly, the carboxylate anion (COO−) in coordination polymers 1 and 2 could be protonated into carboxylic acid (–COOH), upon exposure to HCl vapor. As a result, coordination polymers 1 and 2 display reversible luminescent switching in the response to acid-base vapor stimuli, which mainly originates from the conversion between lone-pair–π and cation–π interactions mediated by the protonation-deprotonation processes. Such stimulus-responsive conversion between lone-pair–π and cation–π interactions is first reported in coordination polymers, and provides a promising approach to design and construct smart coordination polymer materials. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00958972
- Volume :
- 73
- Issue :
- 5
- Database :
- Academic Search Index
- Journal :
- Journal of Coordination Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 143696694
- Full Text :
- https://doi.org/10.1080/00958972.2020.1751133