A new Exo III assisted strand-cleavage cycle and ligand-responsive quadruplex formation strategy for amplified and label-free detection of IFN-γ was reported with a detection limit of 0.1 pM and a visual detection limit of 20 pM by the naked eye.

No abstract

The asymmetric unit of the title ion-pair complex, (C9H12NO2)2[Ni(C4N2S2)2], contains two 1-(eth­oxy­carbonyl­meth­yl)pyridinium cations and one bis­(1,2-dicyano­ethene-1,2-dithiol­ato)nickelate(II) dianion, which exhibits a slightly distorted square-planar coordination geometry. In the crystal, the cations are linked by strong C—H⋯O hydrogen bonds into C(6) chains along [100]. The cations and anions are linked into a three-dimensional architecture by weak C—H⋯N and C—H⋯S inter­actions.