Metal Exchange in Thioguanosine Coordination Polymers of Gold (I) and Silver (I)
Chayanan Tangsombun, Liam F. McGarry, Osama El‐Zubir, Andrew Houlton, Benjamin R. Horrocks
TL;DR
Gold and silver ions form helical polymers with 6-thioguanosine, and these polymers can exchange metals over time, forming new structures.
Contribution
The discovery that homopolymers of gold and silver with 6-thioguanosine can exchange metals to form heterometallic polymers.
Findings
The composition of the heterometallic polymer matches the mole fractions of the metals in the solution.
Metal-ligand bonds are labile, allowing metal exchange in about 5 hours at room temperature.
Heterometallic polymers form helical structures with complex supramolecular behavior.
Abstract
Heterometallic coordination polymers of Au(I) and Ag(I) with 6‐thioguanosine, poly([AuxAg1-x(6-tG)] ), have been prepared and were observed to form hydrogels. We find that the composition of the heterometallic polymer is proportional to the mole fractions of the metals in the preparation solution. Optical absorption spectra show single peaks for λ>300 nm which can be interpolated in a linear manner between x =0.0 and x =1.0 consistent with the formation of a heterometallic polymer rather than a mixture of homopolymers. However photoluminescence and circular dichroism spectra are sensitive to the supramolecular structure of the polymers and show more complex behaviour. Atomic force microscopy indicated that the molecular chains of the Au homopolymer entwine to form strands that are predominantly right‐hand helices. The Ag homopolymer has previously been shown to form left‐hand helices.…
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Taxonomy
TopicsMetal complexes synthesis and properties · Organometallic Compounds Synthesis and Characterization · Metal-Organic Frameworks: Synthesis and Applications