Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 25, Issue 7, Pages 1781-1786Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201805172
Keywords
molecular recognition; palladium; self-assembly; spiro compounds; structural transformation
Categories
Funding
- Royal Society of New Zealand
- University of Canterbury
- MacDiarmid Institute
Ask authors/readers for more resources
Structural changes to metallosupramolecular assemblies resulting in the release or uptake of guests are currently well established, whereas transformations turning on and off specific self-recognition are far less developed. We report a novel ligand (2,6-bis(1-(3-pyridin-4-yl)phenyl-1H-1,2,3-triazol-4-yl)pyridine) possessing a tridentate central metal-binding site flanked by two pendant pyridyl arms. In a 2:1 ratio with Pd-II metal ions, a spiro-type [PdL2](2+) Figure-of-eight complex forms with the central tridentate binding pocket unoccupied. The introduction of an additional one equivalent of Pd-II metal ion results in the conversion to a dimeric [Pd2L2](4+) molecule with the tridentate pocket occupied. There is site-specific self-recognition between dimers in solution with strong NOE peaks between adjacent molecules. The self-recognition between dimers can be turned off in two ways: firstly, adding another equivalent of Pd-II metal ion brings about binding to the previously uncoordinated pyridyl arms that are key to the self-recognition event, and; secondly, addition of sufficient ligand to return the stoichiometry to 2:1 regenerates the [PdL2](2+) complex. Hence, the self-recognition event can be turned on or off through simple variation of L:Pd-II stoichiometry.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available