Subcomponent Exchange Transforms an Fe<SUP>II</SUP>₄L₄ Cage from High- to Low-Spin, Switching Guest Release in a Two-Cage System

McConnell, Anna J, Aitchison, Catherine M ORCID: 0000-0003-1437-8314, Grommet, Angela B and Nitschke, Jonathan R (2017) Subcomponent Exchange Transforms an Fe<SUP>II</SUP>₄L₄ Cage from High- to Low-Spin, Switching Guest Release in a Two-Cage System. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 139 (18). pp. 6294-6297.

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Abstract

Subcomponent exchange transformed new high-spin Fe^II₄L₄ cage 1 into previously-reported low-spin Fe^II₄L₄ 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 Fe^II 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 Fe^II₄L₆ 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.

Item Type:	Article
Depositing User:	Symplectic Admin
Date Deposited:	15 May 2019 12:58
Last Modified:	14 Oct 2023 09:33
DOI:	10.1021/jacs.7b01478
Open Access URL:	https://pubs.acs.org/doi/pdf/10.1021/jacs.7b01478
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3041463