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Post-assembly Modification of Tetrazine-Edged Fe(II)4L6 Tetrahedra.


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Authors

Roberts, Derrick A 
Pilgrim, Ben S 
Cooper, Jonathan D 
Ronson, Tanya K 
Zarra, Salvatore 

Abstract

Post-assembly modification (PAM) is a powerful tool for the modular functionalization of self-assembled structures. We report a new family of tetrazine-edged Fe(II)4L6 tetrahedral cages, prepared using different aniline subcomponents, which undergo rapid and efficient PAM by inverse electron-demand Diels-Alder (IEDDA) reactions. Remarkably, the electron-donating or -withdrawing ability of the para-substituent on the aniline moiety influences the IEDDA reactivity of the tetrazine ring 11 bonds away. This effect manifests as a linear free energy relationship, quantified using the Hammett equation, between σ(para) and the rate of the IEDDA reaction. The rate of PAM can thus be adjusted by varying the aniline subcomponent.

Description

Keywords

0306 Physical Chemistry (incl. Structural)

Journal Title

J Am Chem Soc

Conference Name

Journal ISSN

0002-7863
1520-5126

Volume Title

137

Publisher

American Chemical Society (ACS)
Sponsorship
Engineering and Physical Sciences Research Council (EP/I005447/1)
Engineering and Physical Sciences Research Council (EP/J001163/1)
This work was supported by the UK Engineering and Physical Sciences Research Council (EPSRC). The au-thors thank Diamond Light Source (UK) for synchro-tron beamtime on I19 (MT8464), the Department of Chemistry NMR facility, University of Cambridge, and the EPSRC UK National Mass Spectrometry Facility at Swansea University. D.A.R. acknowledges the Gates Cambridge Trust for Ph.D. funding. B.S.P. acknowledges the Herchel Smith Research Fellowship from the University of Cambridge and the Fellowship from Corpus Christi College, Cambridge.