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. 2009 Mar 18;131(10):3487-9.
doi: 10.1021/ja809788x.

Direct and quantitative characterization of dynamic ligand exchange between coordination-driven self-assembled supramolecular polygons

Yao-Rong Zheng  1 , Peter J Stang
Affiliations

Direct and quantitative characterization of dynamic ligand exchange between coordination-driven self-assembled supramolecular polygons

Yao-Rong Zheng et al. J Am Chem Soc. .

Abstract

The direct observation of dynamic ligand exchange between Pt-N coordination-driven self-assembled supramolecular polygons (triangles and rectangles) has been achieved using stable (1)H/(2)D isotope labeling of the pyridyl donors and electrospray ionization mass spectrometry combined with NMR spectroscopy. Both the thermodynamic and kinetic aspects of such exchange processes have been established on the basis of quantitative mass spectral results. Further investigation has shown that the exchange is highly dependent on experimental conditions such as temperature, solvent, and the counteranions.

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Figures

Figure 1
Figure 1
Schematic and molecular structures of linear dipyridyl donors 1 and 2 as well as 0° and 60° organoplatinum acceptors 3 and 4, respectively.
Figure 2
Figure 2
ESI-MS spectra of dynamic ligand exchange between (a) supramolecular rectangles (5a and 5b), (b) supramolecular triangles (6a and 6b), and (c) both rectangle 5a and triangle 6b recorded at different time intervals (d: day).
Figure 3
Figure 3
Plot of ESI-MS data obtained over 240 h displaying the first-order exchange kinetics for supramolecular rectangles 5a and 5b.
Figure 4
Figure 4
ESI-MS spectra of ligand exchange between 5a and 5b influenced by differences in (a) temperature, (b) solvent, and (c) counter anion.
Scheme 1
Scheme 1
Representation of the dynamic ligand exchange between the same (a and b) and different types (c) of supramolecular polygons (rectangles: 5a and 5b; triangles: 6a and 6b) with isotope label (1H / 2D).
See this image and copyright information in PMC

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