Circularly polarised luminescence in an RNA-based homochiral, self-repairing, coordination polymer hydrogel

The aqueous equimolar reaction of Ag(i) ions with the thionucleoside enantiomer (-)6-thioguanosine, ((-)6tGH), yields a one-dimensional coordination polymer {Ag(-)tG}(n), the self-assembly of which generates left-handed helical chains. The resulting helicity induces an enhanced chiro-optical response compared to the parent ligand. DFT calculations indicate that this enhancement is due to delocalisation of the excited state along the helical chains, with 7 units being required to converge the calculated CD spectra. At concentrations >= 15 mmol l(-1) reactions form a sample-spanning hydrogel which shows self-repair capabilities with instantaneous recovery in which the dynamic reversibility of the coordination chains appears to play a role. The resulting gel exhibits circularly polarised luminescence (CPL) with a large dissymmetry factor of -0.07 +/- 0.01 at 735 nm, a phenomenon not previously observed for this class of coordination polymer.

Automated summary

This article discusses the properties of a one-dimensional coordination polymer formed by the reaction of Ag(i) ions with the thionucleoside enantiomer. The study found that the resulting polymer has a left-handed helical chain structure and exhibits enhanced chiro-optical response compared to the parent ligand. Experimental results also show that at higher concentrations, the reaction forms a self-repairing hydrogel that exhibits circularly polarised luminescence.