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In the title mol­ecule, C7H4N2O2S2, the nitro group is twisted by 5.5 (1)° from the plane of the attached benzene ring. In the crystal, N—H⋯S hydrogen bonds link pairs of mol­ecules into inversion dimers, which are linked by weak C—H⋯O inter­actions into sheets parallel to (101). The crystal packing exhibits short inter­molecular S⋯O contacts of 3.054 (4) Å and π–π inter­actions of 3.588 (5) Å between the centroids of the five- and six-membered rings of neighbouring mol­ecules.

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Five mono-nuclear silver(I) complexes with the ligand 2,9dimethyl-1,10-phenanthroline, namely [Ag(DPEphos)(dmp)]BF 4 (1), (4), and [Ag(dppb)(dmp)]NO 3 ·CH 3 OH (5) {DPEphos = bis[2-(diphenylphosphanyl)phenyl]ether, dppb = 1,2bis(diphenylphosphanyl)benzene, dmp = 2,9-dimethyl-1,10-phenanthroline} were characterized by X-ray diffraction, IR, 1 H NMR, 31 P NMR and fluorescence spectroscopy. Their terahertz (THz) time-