Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 139, Issue 18, Pages 6294-6297Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.7b01478
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Funding
- European Research Council [695009]
- UK Engineering and Physical Sciences Research Council (EPSRC) [EP/M01083X/1]
- Cambridge Trusts
- EPSRC [EP/K039520/1, EP/M01083X/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/K039520/1, EP/M01083X/1] Funding Source: researchfish
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Subcomponent exchange transformed new high-spin (Fe4L4)-L-II cage 1 into previously-reported low-spin (Fe4L4)-L-II cage 2: 2-formyl-6-methylpyridine was ejected in favor of the less sterically hindered 2-formylpyridine, with concomitant high- to low-spin transition of the cage's Fell centers. High-spin 1 also reacted more readily with electron-rich anilines than 2, enabling the design of a system consisting of two cages that could release their guests in response to combinations of different stimuli. The addition of p-anisidine to a mixture of high-spin 1 and previously-reported low-spin (Fe4L4)-L-II cage 3 resulted in the destruction of 1 and the release of its guest. However, initial addition of 2-formylpyridine to an identical mixture of 1 and 3 resulted in the transformation of 1 into 2; added p-anisidine then reacted preferentially with 3 releasing its guest. The addition of 2-formylpyridine thus modulated the system's behavior, fundamentally altering its response to the subsequent signal p-anisidine.
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